diff --git a/tests/phpunit/includes/bootstrap.php b/tests/phpunit/includes/bootstrap.php
index 5d3e159685..41f8ea6a2c 100644
--- a/tests/phpunit/includes/bootstrap.php
+++ b/tests/phpunit/includes/bootstrap.php
@@ -85,6 +85,8 @@ unset( $multisite );
 $GLOBALS['_wp_die_disabled'] = false;
 // Allow tests to override wp_die
 tests_add_filter( 'wp_die_handler', '_wp_die_handler_filter' );
+// Use the Spy REST Server instead of default
+tests_add_filter( 'wp_rest_server_class', '_wp_rest_server_class_filter' );
 
 // Preset WordPress options defined in bootstrap file.
 // Used to activate themes, plugins, as well as  other settings.
diff --git a/tests/phpunit/includes/functions.php b/tests/phpunit/includes/functions.php
index 9a450ece84..696741166e 100644
--- a/tests/phpunit/includes/functions.php
+++ b/tests/phpunit/includes/functions.php
@@ -180,6 +180,13 @@ function _upload_dir_https( $uploads ) {
 	return $uploads;
 }
 
+/**
+ * Use the Spy_REST_Server class for the REST server.
+ */
+function _wp_rest_server_class_filter() {
+	return 'Spy_REST_Server';
+}
+
 // Skip `setcookie` calls in auth_cookie functions due to warning:
 // Cannot modify header information - headers already sent by ...
 tests_add_filter( 'send_auth_cookies', '__return_false' );
diff --git a/tests/phpunit/includes/testcase-rest-controller.php b/tests/phpunit/includes/testcase-rest-controller.php
index 04e1cf2f96..bafd1f8508 100644
--- a/tests/phpunit/includes/testcase-rest-controller.php
+++ b/tests/phpunit/includes/testcase-rest-controller.php
@@ -9,8 +9,8 @@ abstract class WP_Test_REST_Controller_Testcase extends WP_Test_REST_TestCase {
 		add_filter( 'rest_url', array( $this, 'filter_rest_url_for_leading_slash' ), 10, 2 );
 		/** @var WP_REST_Server $wp_rest_server */
 		global $wp_rest_server;
-		$this->server = $wp_rest_server = new Spy_REST_Server;
-		do_action( 'rest_api_init' );
+		$wp_rest_server = new Spy_REST_Server;
+		do_action( 'rest_api_init', $wp_rest_server );
 	}
 
 	public function tearDown() {
diff --git a/tests/phpunit/tests/oembed/controller.php b/tests/phpunit/tests/oembed/controller.php
index 0d91408769..d5ae649072 100644
--- a/tests/phpunit/tests/oembed/controller.php
+++ b/tests/phpunit/tests/oembed/controller.php
@@ -45,15 +45,18 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 
 		/** @var WP_REST_Server $wp_rest_server */
 		global $wp_rest_server;
-		$this->server = $wp_rest_server = new Spy_REST_Server();
+		$wp_rest_server = new Spy_REST_Server;
+		do_action( 'rest_api_init', $wp_rest_server );
 
-		do_action( 'rest_api_init', $this->server );
 		add_filter( 'pre_http_request', array( $this, 'mock_embed_request' ), 10, 3 );
 		$this->request_count = 0;
 	}
 
 	public function tearDown() {
 		parent::tearDown();
+		/** @var WP_REST_Server $wp_rest_server */
+		global $wp_rest_server;
+		$wp_rest_server = null;
 
 		remove_filter( 'pre_http_request', array( $this, 'mock_embed_request' ), 10 );
 	}
@@ -179,7 +182,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 
 	public function test_route_availability() {
 		// Check the route was registered correctly.
-		$filtered_routes = $this->server->get_routes();
+		$filtered_routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/oembed/1.0/embed', $filtered_routes );
 		$route = $filtered_routes['/oembed/1.0/embed'];
 		$this->assertCount( 1, $route );
@@ -200,7 +203,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 	function test_request_with_wrong_method() {
 		$request = new WP_REST_Request( 'POST', '/oembed/1.0/embed' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 'rest_no_route', $data['code'] );
@@ -209,7 +212,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 	function test_request_without_url_param() {
 		$request = new WP_REST_Request( 'GET', '/oembed/1.0/embed' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 'rest_missing_callback_param', $data['code'] );
@@ -220,7 +223,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request = new WP_REST_Request( 'GET', '/oembed/1.0/embed' );
 		$request->set_param( 'url', 'http://google.com/' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 'oembed_invalid_url', $data['code'] );
@@ -233,7 +236,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', get_permalink( $post_id ) );
 		$request->set_param( 'format', 'random' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertInternalType( 'array', $data );
@@ -257,7 +260,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', get_permalink( $post->ID ) );
 		$request->set_param( 'maxwidth', 400 );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertInternalType( 'array', $data );
@@ -300,7 +303,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', home_url() );
 		$request->set_param( 'maxwidth', 400 );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertInternalType( 'array', $data );
@@ -345,7 +348,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'format', 'xml' );
 		$request->set_param( 'maxwidth', 400 );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertInternalType( 'array', $data );
@@ -388,7 +391,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', get_permalink( $post->ID ) );
 		$request->set_param( 'maxwidth', 400 );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertInternalType( 'array', $data );
@@ -414,8 +417,8 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', get_permalink( $post->ID ) );
 		$request->set_param( 'format', 'xml' );
 
-		$response = $this->server->dispatch( $request );
-		$output   = get_echo( '_oembed_rest_pre_serve_request', array( true, $response, $request, $this->server ) );
+		$response = rest_get_server()->dispatch( $request );
+		$output   = get_echo( '_oembed_rest_pre_serve_request', array( true, $response, $request, rest_get_server() ) );
 
 		$xml = simplexml_load_string( $output );
 		$this->assertInstanceOf( 'SimpleXMLElement', $xml );
@@ -428,9 +431,9 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', get_permalink( $post->ID ) );
 		$request->set_param( 'format', 'json' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
-		$this->assertTrue( _oembed_rest_pre_serve_request( true, $response, $request, $this->server ) );
+		$this->assertTrue( _oembed_rest_pre_serve_request( true, $response, $request, rest_get_server() ) );
 	}
 
 	function test_rest_pre_serve_request_wrong_method() {
@@ -440,9 +443,9 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', get_permalink( $post->ID ) );
 		$request->set_param( 'format', 'xml' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
-		$this->assertTrue( _oembed_rest_pre_serve_request( true, $response, $request, $this->server ) );
+		$this->assertTrue( _oembed_rest_pre_serve_request( true, $response, $request, rest_get_server() ) );
 	}
 
 	function test_get_oembed_endpoint_url() {
@@ -477,7 +480,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 	public function test_proxy_without_permission() {
 		// Test without a login.
 		$request  = new WP_REST_Request( 'GET', '/oembed/1.0/proxy' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 400, $response->get_status() );
 
@@ -485,7 +488,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		wp_set_current_user( self::$subscriber );
 		$request = new WP_REST_Request( 'GET', '/oembed/1.0/proxy' );
 		$request->set_param( 'url', self::INVALID_OEMBED_URL );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 403, $response->get_status() );
 		$data = $response->get_data();
@@ -496,7 +499,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		wp_set_current_user( self::$editor );
 		$request = new WP_REST_Request( 'GET', '/oembed/1.0/proxy' );
 		$request->set_param( 'url', self::INVALID_OEMBED_URL );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'oembed_invalid_url', $data['code'] );
@@ -506,7 +509,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		wp_set_current_user( self::$editor );
 		$request = new WP_REST_Request( 'GET', '/oembed/1.0/proxy' );
 		$request->set_param( 'type', 'xml' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 400, $response->get_status() );
 	}
@@ -518,12 +521,12 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'maxwidth', 456 );
 		$request->set_param( 'maxheight', 789 );
 		$request->set_param( '_wpnonce', wp_create_nonce( 'wp_rest' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 1, $this->request_count );
 
 		// Subsequent request is cached and so it should not cause a request.
-		$this->server->dispatch( $request );
+		rest_get_server()->dispatch( $request );
 		$this->assertEquals( 1, $this->request_count );
 
 		// Rest with another user should also be cached.
@@ -533,7 +536,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( '_wpnonce', wp_create_nonce( 'wp_rest' ) );
 		$request->set_param( 'maxwidth', 456 );
 		$request->set_param( 'maxheight', 789 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 1, $this->request_count );
 
 		// Test data object.
@@ -554,7 +557,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request = new WP_REST_Request( 'GET', '/oembed/1.0/proxy' );
 		$request->set_param( 'url', self::INVALID_OEMBED_URL );
 		$request->set_param( 'discover', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 		$this->assertEquals( 0, $this->request_count );
 	}
@@ -565,7 +568,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		// For an unkown provider, a discovery request should happen.
 		$request = new WP_REST_Request( 'GET', '/oembed/1.0/proxy' );
 		$request->set_param( 'url', self::INVALID_OEMBED_URL );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 		$this->assertEquals( 1, $this->request_count );
 	}
@@ -576,7 +579,7 @@ class Test_oEmbed_Controller extends WP_UnitTestCase {
 		$request->set_param( 'url', self::INVALID_OEMBED_URL );
 		$request->set_param( 'discover', 'notaboolean' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 400, $response->get_status() );
 		$data = $response->get_data();
diff --git a/tests/phpunit/tests/rest-api/rest-attachments-controller.php b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
index a25d31358a..c93b8b09ab 100644
--- a/tests/phpunit/tests/rest-api/rest-attachments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-attachments-controller.php
@@ -76,7 +76,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/media', $routes );
 		$this->assertCount( 2, $routes['/wp/v2/media'] );
 		$this->assertArrayHasKey( '/wp/v2/media/(?P<id>[\d]+)', $routes );
@@ -127,7 +127,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/media' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -139,7 +139,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request       = new WP_REST_Request( 'OPTIONS', '/wp/v2/media/' . $attachment_id );
-		$response      = $this->server->dispatch( $request );
+		$response      = rest_get_server()->dispatch( $request );
 		$data          = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -147,7 +147,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 	public function test_registered_query_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/media' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -194,7 +194,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request  = new WP_REST_Request( 'OPTIONS', sprintf( '/wp/v2/media/%d', $id1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -224,7 +224,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request        = new WP_REST_Request( 'GET', '/wp/v2/media' );
-		$response       = $this->server->dispatch( $request );
+		$response       = rest_get_server()->dispatch( $request );
 		$data           = $response->get_data();
 		$this->assertCount( 2, $data );
 		$ids = wp_list_pluck( $data, 'id' );
@@ -258,7 +258,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request        = new WP_REST_Request( 'GET', '/wp/v2/media' );
-		$response       = $this->server->dispatch( $request );
+		$response       = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertCount( 3, $data );
@@ -275,16 +275,16 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/media' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $id1, $data[0]['id'] );
 		// media_type=video
 		$request->set_param( 'media_type', 'video' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 0, $response->get_data() );
 		// media_type=image
 		$request->set_param( 'media_type', 'image' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $id1, $data[0]['id'] );
 	}
@@ -296,16 +296,16 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/media' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $id1, $data[0]['id'] );
 		// mime_type=image/png
 		$request->set_param( 'mime_type', 'image/png' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 0, $response->get_data() );
 		// mime_type=image/jpeg
 		$request->set_param( 'mime_type', 'image/jpeg' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $id1, $data[0]['id'] );
 	}
@@ -326,26 +326,26 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		);
 		// all attachments
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/media' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 2, count( $response->get_data() ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		// attachments without a parent
 		$request->set_param( 'parent', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $attachment_id2, $data[0]['id'] );
 		// attachments with parent=post_id
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'parent', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $attachment_id, $data[0]['id'] );
 		// attachments with invalid parent
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'parent', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 0, count( $data ) );
 	}
@@ -361,7 +361,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'status', 'publish' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 3, $data );
 		$this->assertEquals( 'rest_invalid_param', $data['code'] );
@@ -379,11 +379,11 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		);
 		$request        = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'status', 'private' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		// Properly authorized users can make the request
 		wp_set_current_user( self::$editor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( $attachment_id1, $data[0]['id'] );
@@ -408,11 +408,11 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		);
 		$request        = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'status', array( 'private', 'trash' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		// Properly authorized users can make the request
 		wp_set_current_user( self::$editor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -428,7 +428,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'after', rand_str() );
 		$request->set_param( 'before', rand_str() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -457,7 +457,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'after', '2016-01-15T00:00:00Z' );
 		$request->set_param( 'before', '2016-01-17T00:00:00Z' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $id2, $data[0]['id'] );
@@ -472,7 +472,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		);
 		update_post_meta( $attachment_id, '_wp_attachment_image_alt', 'Sample alt text' );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/media/' . $attachment_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_post_response( $response );
 		$data = $response->get_data();
 		$this->assertEquals( 'image/jpeg', $data['mime_type'] );
@@ -490,7 +490,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		wp_update_attachment_metadata( $attachment_id, wp_generate_attachment_metadata( $attachment_id, $this->test_file ) );
 
 		$request            = new WP_REST_Request( 'GET', '/wp/v2/media/' . $attachment_id );
-		$response           = $this->server->dispatch( $request );
+		$response           = rest_get_server()->dispatch( $request );
 		$data               = $response->get_data();
 		$image_src          = wp_get_attachment_image_src( $attachment_id, 'rest-api-test' );
 		$original_image_src = wp_get_attachment_image_src( $attachment_id, 'full' );
@@ -516,7 +516,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		add_filter( 'wp_get_attachment_image_src', '__return_false' );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/media/' . $attachment_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		remove_filter( 'wp_get_attachment_image_src', '__return_false' );
 		remove_image_size( 'rest-api-test' );
@@ -534,7 +534,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request    = new WP_REST_Request( 'GET', '/wp/v2/media/' . $id1 );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 401, $response->get_status() );
 	}
 
@@ -546,7 +546,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request       = new WP_REST_Request( 'GET', sprintf( '/wp/v2/media/%d', $attachment_id ) );
-		$response      = $this->server->dispatch( $request );
+		$response      = rest_get_server()->dispatch( $request );
 		$data          = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -562,7 +562,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request       = new WP_REST_Request( 'GET', sprintf( '/wp/v2/media/%d', $attachment_id ) );
-		$response      = $this->server->dispatch( $request );
+		$response      = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_forbidden', $response, 401 );
 	}
@@ -579,7 +579,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request->set_param( 'alt_text', 'Alt text is stored outside post schema.' );
 
 		$request->set_body( file_get_contents( $this->test_file ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 201, $response->get_status() );
@@ -610,7 +610,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request->set_header( 'Content-MD5', md5_file( $this->test_file2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'codeispoetry', $data['title']['raw'] );
@@ -630,7 +630,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request->set_header( 'Content-MD5', md5_file( $this->test_file ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 	}
 
@@ -648,14 +648,14 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request->set_header( 'Content-MD5', md5_file( $this->test_file ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 	}
 
 	public function test_create_item_empty_body() {
 		wp_set_current_user( self::$author_id );
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_upload_no_data', $response, 400 );
 	}
 
@@ -663,7 +663,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		wp_set_current_user( self::$author_id );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
 		$request->set_body( file_get_contents( $this->test_file ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_upload_no_content_type', $response, 400 );
 	}
 
@@ -672,7 +672,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
 		$request->set_header( 'Content-Type', 'image/jpeg' );
 		$request->set_body( file_get_contents( $this->test_file ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_upload_no_content_disposition', $response, 400 );
 	}
 
@@ -683,7 +683,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
 		$request->set_header( 'Content-MD5', 'abc123' );
 		$request->set_body( file_get_contents( $this->test_file ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_upload_hash_mismatch', $response, 412 );
 	}
 
@@ -701,14 +701,14 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request->set_header( 'Content-MD5', 'abc123' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_upload_hash_mismatch', $response, 412 );
 	}
 
 	public function test_create_item_invalid_upload_files_capability() {
 		wp_set_current_user( self::$contributor_id );
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/media' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_create', $response, 403 );
 	}
 
@@ -717,7 +717,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		wp_set_current_user( self::$author_id );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 403 );
 	}
 
@@ -726,7 +726,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		wp_set_current_user( self::$uploader_id );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/media' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 403 );
 	}
 
@@ -744,7 +744,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
 		$request->set_body( file_get_contents( $this->test_file ) );
 		$request->set_param( 'post', $attachment_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -756,7 +756,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 		$request->set_body( file_get_contents( $this->test_file ) );
 		$request->set_param( 'alt_text', 'test alt text' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$attachment = $response->get_data();
 		$this->assertEquals( 'test alt text', $attachment['alt_text'] );
 	}
@@ -768,7 +768,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request->set_header( 'Content-Disposition', 'attachment; filename=canola.jpg' );
 		$request->set_body( file_get_contents( $this->test_file ) );
 		$request->set_param( 'alt_text', '<script>alert(document.cookie)</script>' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$attachment = $response->get_data();
 		$this->assertEquals( '', $attachment['alt_text'] );
 	}
@@ -787,7 +787,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$request->set_param( 'caption', 'This is a better caption.' );
 		$request->set_param( 'description', 'Without a description, my attachment is descriptionless.' );
 		$request->set_param( 'alt_text', 'Alt text is stored outside post schema.' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$attachment = get_post( $data['id'] );
 		$this->assertEquals( 'My title is very cool', $data['title']['raw'] );
@@ -817,7 +817,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		$new_parent = $this->factory->post->create( array() );
 		$request    = new WP_REST_Request( 'POST', '/wp/v2/media/' . $attachment_id );
 		$request->set_param( 'post', $new_parent );
-		$this->server->dispatch( $request );
+		rest_get_server()->dispatch( $request );
 
 		$attachment = get_post( $attachment_id );
 		$this->assertEquals( $new_parent, $attachment->post_parent );
@@ -834,7 +834,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		);
 		$request       = new WP_REST_Request( 'POST', '/wp/v2/media/' . $attachment_id );
 		$request->set_param( 'caption', 'This is a better caption.' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 403 );
 	}
 
@@ -856,7 +856,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		);
 		$request       = new WP_REST_Request( 'POST', '/wp/v2/media/' . $attachment_id );
 		$request->set_param( 'post', $attachment_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -870,7 +870,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		foreach ( $input as $name => $value ) {
 			$request->set_param( $name, $value );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -902,7 +902,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		foreach ( $input as $name => $value ) {
 			$request->set_param( $name, $value );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -1120,7 +1120,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 		);
 		$request          = new WP_REST_Request( 'DELETE', '/wp/v2/media/' . $attachment_id );
 		$request['force'] = true;
-		$response         = $this->server->dispatch( $request );
+		$response         = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -1135,11 +1135,11 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 		// Attempt trashing
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/media/' . $attachment_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		// Ensure the post still exists
@@ -1157,7 +1157,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 		$request       = new WP_REST_Request( 'DELETE', '/wp/v2/media/' . $attachment_id );
-		$response      = $this->server->dispatch( $request );
+		$response      = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_delete', $response, 403 );
 	}
 
@@ -1172,7 +1172,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 		$attachment = get_post( $attachment_id );
 		$request    = new WP_REST_Request( 'GET', sprintf( '/wp/v2/media/%d', $attachment_id ) );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$this->check_post_data( $attachment, $data, 'view', $response->get_links() );
 		$this->check_post_data( $attachment, $data, 'embed', $response->get_links() );
@@ -1180,7 +1180,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/media' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 24, count( $properties ) );
@@ -1234,7 +1234,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/media' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
 		$this->assertEquals( $schema, $data['schema']['properties']['my_custom_int'] );
@@ -1248,7 +1248,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media/' . $attachment_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		global $wp_rest_additional_fields;
@@ -1287,7 +1287,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
@@ -1311,7 +1311,7 @@ class WP_Test_REST_Attachments_Controller extends WP_Test_REST_Post_Type_Control
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/media' );
 		$request->set_param( 'search', $filename );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertCount( 1, $data );
diff --git a/tests/phpunit/tests/rest-api/rest-categories-controller.php b/tests/phpunit/tests/rest-api/rest-categories-controller.php
index 4161a5bd69..2ef94d6e8a 100644
--- a/tests/phpunit/tests/rest-api/rest-categories-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-categories-controller.php
@@ -33,7 +33,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/categories', $routes );
 		$this->assertArrayHasKey( '/wp/v2/categories/(?P<id>[\d]+)', $routes );
 	}
@@ -41,14 +41,14 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/categories' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$category1 = $this->factory->category->create( array( 'name' => 'Season 5' ) );
 		$request   = new WP_REST_Request( 'OPTIONS', '/wp/v2/categories/' . $category1 );
-		$response  = $this->server->dispatch( $request );
+		$response  = rest_get_server()->dispatch( $request );
 		$data      = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -56,7 +56,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_registered_query_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/categories' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -80,7 +80,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_items() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_taxonomy_terms_response( $response );
 	}
 
@@ -88,7 +88,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
@@ -99,7 +99,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_object_terms( $post_id, array( $category1, $category2 ), 'category' );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'hide_empty', true );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( 'Season 5', $data[0]['name'] );
@@ -107,7 +107,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		// Confirm the empty category "Uncategorized" category appears.
 		$request->set_param( 'hide_empty', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 3, count( $data ) );
 	}
@@ -129,7 +129,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'parent', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
@@ -159,7 +159,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'parent', '0' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
@@ -177,7 +177,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'parent', $parent1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
@@ -188,7 +188,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 	public function test_get_items_invalid_page() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'page', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		$data        = $response->get_data();
 		$first_error = array_shift( $data['data']['params'] );
@@ -202,13 +202,13 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		// Orderby=>asc
 		$request->set_param( 'include', array( $id3, $id1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id1, $data[0]['id'] );
 		// Orderby=>include
 		$request->set_param( 'orderby', 'include' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id3, $data[0]['id'] );
@@ -218,12 +218,12 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$id1      = $this->factory->category->create();
 		$id2      = $this->factory->category->create();
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertTrue( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 		$request->set_param( 'exclude', array( $id2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertFalse( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
@@ -242,7 +242,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request->set_param( 'orderby', 'name' );
 		$request->set_param( 'order', 'desc' );
 		$request->set_param( 'per_page', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
@@ -251,7 +251,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request->set_param( 'orderby', 'name' );
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'per_page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -264,7 +264,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$this->factory->category->create( array( 'name' => 'Banana' ) );
 		// defaults to orderby=name, order=asc
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'Apple', $data[0]['name'] );
@@ -274,7 +274,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		// orderby=id, with default order=asc
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'orderby', 'id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'Uncategorized', $data[0]['name'] );
@@ -285,7 +285,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'orderby', 'id' );
 		$request->set_param( 'order', 'desc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 'Banana', $data[0]['name'] );
@@ -301,7 +301,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'orderby', 'include_slugs' );
 		$request->set_param( 'slug', array( 'taco', 'burrito', 'chalupa' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 'taco', $data[0]['slug'] );
@@ -339,7 +339,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -357,7 +357,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'post', $post_id );
 		$request->set_param( 'orderby', 'description' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -367,7 +367,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		// Flip the order
 		$request->set_param( 'order', 'desc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -382,7 +382,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'post', $post_id );
 		$request->set_param( 'orderby', 'id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -418,7 +418,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/batman' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -435,14 +435,14 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		 */
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'search', 'App' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( 'Apple', $data[0]['name'] );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'search', 'Garbage' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 0, count( $data ) );
@@ -453,7 +453,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$this->factory->category->create( array( 'name' => 'Banana' ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'slug', 'apple' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
@@ -470,7 +470,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'parent', $category1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( 'Child', $data[0]['name'] );
@@ -486,7 +486,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'parent', 'invalid-parent' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -506,13 +506,13 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		);
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/terms/robin' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
 	public function test_get_terms_invalid_taxonomy() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/invalid-taxonomy' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
@@ -526,7 +526,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 			);
 		}
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 50, $headers['X-WP-Total'] );
 		$this->assertEquals( 5, $headers['X-WP-TotalPages'] );
@@ -546,7 +546,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -566,7 +566,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		// Last page
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'page', 6 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -581,7 +581,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		// Out of bounds
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'page', 8 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -607,7 +607,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'page', 1 );
 		$request->set_param( 'per_page', 100 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 18, $headers['X-WP-Total'] );
 		$this->assertEquals( 1, $headers['X-WP-TotalPages'] );
@@ -615,7 +615,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories' );
 		$request->set_param( 'page', 2 );
 		$request->set_param( 'per_page', 100 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 18, $headers['X-WP-Total'] );
 		$this->assertEquals( 1, $headers['X-WP-TotalPages'] );
@@ -624,19 +624,19 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_item() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories/1' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_taxonomy_term_response( $response );
 	}
 
 	public function test_get_term_invalid_taxonomy() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/invalid-taxonomy/1' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
 	public function test_get_term_invalid_term() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -644,7 +644,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/categories/1' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
@@ -658,7 +658,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		);
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/terms/robin/' . $term1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
@@ -671,7 +671,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories/' . $term1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -681,7 +681,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request->set_param( 'name', 'My Awesome Term' );
 		$request->set_param( 'description', 'This term is so awesome.' );
 		$request->set_param( 'slug', 'so-awesome' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$headers = $response->get_headers();
 		$data    = $response->get_data();
@@ -701,7 +701,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories' );
 		$request->set_param( 'name', 'Existing' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 400, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'term_exists', $data['code'] );
@@ -714,7 +714,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/invalid-taxonomy' );
 		$request->set_param( 'name', 'Invalid Taxonomy' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
@@ -722,14 +722,14 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( self::$subscriber );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories' );
 		$request->set_param( 'name', 'Incorrect permissions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_create', $response, 403 );
 	}
 
 	public function test_create_item_missing_arguments() {
 		wp_set_current_user( self::$administrator );
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/categories' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_missing_callback_param', $response, 400 );
 	}
 
@@ -739,7 +739,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories' );
 		$request->set_param( 'name', 'My Awesome Term' );
 		$request->set_param( 'parent', $parent['term_id'] );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( $parent['term_id'], $data['parent'] );
@@ -752,7 +752,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories/' . $term->term_id );
 		$request->set_param( 'name', 'My Awesome Term' );
 		$request->set_param( 'parent', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 400 );
 	}
 
@@ -768,7 +768,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$request->set_param( 'name', 'New Name' );
 		$request->set_param( 'description', 'New Description' );
 		$request->set_param( 'slug', 'new-slug' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'New Name', $data['name'] );
@@ -780,7 +780,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/invalid-taxonomy/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
 		$request->set_param( 'name', 'Invalid Taxonomy' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
@@ -788,7 +788,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
 		$request->set_param( 'name', 'Invalid Term' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -797,7 +797,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$term    = get_term_by( 'id', $this->factory->category->create(), 'category' );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories/' . $term->term_id );
 		$request->set_param( 'name', 'Incorrect permissions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_update', $response, 403 );
 	}
 
@@ -808,7 +808,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories/' . $term->term_id );
 		$request->set_param( 'parent', $parent->term_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -821,7 +821,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/categories/' . $term->term_id );
 		$request->set_param( 'parent', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 400 );
 	}
 
@@ -830,7 +830,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$term    = get_term_by( 'id', $this->factory->category->create( array( 'name' => 'Deleted Category' ) ), 'category' );
 		$request = new WP_REST_Request( 'DELETE', '/wp/v2/categories/' . $term->term_id );
 		$request->set_param( 'force', true );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertTrue( $data['deleted'] );
@@ -842,25 +842,25 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$term = get_term_by( 'id', $this->factory->category->create( array( 'name' => 'Deleted Category' ) ), 'category' );
 
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/categories/' . $term->term_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 	}
 
 	public function test_delete_item_invalid_taxonomy() {
 		wp_set_current_user( self::$administrator );
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/invalid-taxonomy/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
 	public function test_delete_item_invalid_term() {
 		wp_set_current_user( self::$administrator );
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/categories/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -868,7 +868,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( self::$subscriber );
 		$term     = get_term_by( 'id', $this->factory->category->create(), 'category' );
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/categories/' . $term->term_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_delete', $response, 403 );
 	}
 
@@ -876,7 +876,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$term = get_term( 1, 'category' );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories/1' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->check_taxonomy_term( $term, $data, $response->get_links() );
@@ -891,7 +891,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$term  = get_term( $child, 'category' );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/categories/' . $child );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->check_taxonomy_term( $term, $data, $response->get_links() );
@@ -904,7 +904,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/categories' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 9, count( $properties ) );
@@ -938,7 +938,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/categories' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
 		$this->assertEquals( $schema, $data['schema']['properties']['my_custom_int'] );
@@ -946,7 +946,7 @@ class WP_Test_REST_Categories_Controller extends WP_Test_REST_Controller_Testcas
 		$category_id = $this->factory->category->create();
 		$request     = new WP_REST_Request( 'GET', '/wp/v2/categories/' . $category_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		global $wp_rest_additional_fields;
diff --git a/tests/phpunit/tests/rest-api/rest-comments-controller.php b/tests/phpunit/tests/rest-api/rest-comments-controller.php
index 91255bae6b..b0538c3faf 100644
--- a/tests/phpunit/tests/rest-api/rest-comments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-comments-controller.php
@@ -122,7 +122,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 
 		$this->assertArrayHasKey( '/wp/v2/comments', $routes );
 		$this->assertCount( 2, $routes['/wp/v2/comments'] );
@@ -133,13 +133,13 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/comments/' . self::$approved_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -147,7 +147,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 	public function test_registered_query_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -182,7 +182,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$comments = $response->get_data();
@@ -206,7 +206,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->set_param( 'password', 'toomanysecrets' );
 		$request->set_param( 'post', self::$password_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -227,7 +227,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'password', 'toomanysecrets' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -249,7 +249,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->set_param( 'password', 'toomanysecrets' );
 		$request->set_param( 'post', array( self::$password_id, self::$post_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read_post', $response, 401 );
 	}
 
@@ -264,7 +264,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -282,7 +282,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -300,7 +300,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -318,7 +318,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -337,7 +337,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -358,7 +358,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$collection_data = $response->get_data();
@@ -371,7 +371,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
@@ -380,7 +380,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$admin_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'post', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$comments = $response->get_data();
 		$this->assertCount( 2, $comments );
@@ -390,7 +390,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'post', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 401 );
 	}
 
@@ -398,7 +398,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$admin_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -413,7 +413,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$comments = $response->get_data();
@@ -433,24 +433,24 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		// Order=>asc
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'include', array( $id3, $id1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id1, $data[0]['id'] );
 		// Orderby=>include
 		$request->set_param( 'orderby', 'include' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id3, $data[0]['id'] );
 		// Orderby=>invalid should fail.
 		$request->set_param( 'orderby', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		// fails on invalid id.
 		$request->set_param( 'orderby', array( 'include' ) );
 		$request->set_param( 'include', array( 'invalid' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -463,19 +463,19 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$id1      = $this->factory->comment->create( $args );
 		$id2      = $this->factory->comment->create( $args );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertTrue( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 		$request->set_param( 'exclude', array( $id2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertFalse( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 
 		// fails on invalid id.
 		$request->set_param( 'exclude', array( 'invalid' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -490,19 +490,19 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$this->factory->comment->create( $args );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'offset', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 3, $response->get_data() );
 		// 'offset' works with 'per_page'
 		$request->set_param( 'per_page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// 'offset' takes priority over 'page'
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// 'offset' with invalid value errors.
 		$request->set_param( 'offset', 'moreplease' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -517,17 +517,17 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$id3     = $this->factory->comment->create( $args );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		// order defaults to 'desc'
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $id3, $data[0]['id'] );
 		// order=>asc
 		$request->set_param( 'order', 'asc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( self::$approved_id, $data[0]['id'] );
 		// order=>asc,id should fail
 		$request->set_param( 'order', 'asc,id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -536,7 +536,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$post_id = $this->factory->post->create( array( 'post_status' => 'private' ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read_post', $response, 401 );
 	}
 
@@ -557,24 +557,24 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		// 'author' limits result to 1 of 3
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'author', self::$author_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$comments = $response->get_data();
 		$this->assertCount( 1, $comments );
 		// Multiple authors are supported
 		$request->set_param( 'author', array( self::$author_id, self::$subscriber_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$comments = $response->get_data();
 		$this->assertCount( 2, $comments );
 		// Invalid author param errors
 		$request->set_param( 'author', 'skippy' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		// Unavailable to unauthenticated; defaults to error
 		wp_set_current_user( 0 );
 		$request->set_param( 'author', array( self::$author_id, self::$subscriber_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_param', $response, 401 );
 	}
 
@@ -593,33 +593,33 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$this->factory->comment->create( $args );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$comments = $response->get_data();
 		$this->assertCount( 4, $comments );
 
 		// 'author_exclude' limits result to 3 of 4
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'author_exclude', self::$author_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$comments = $response->get_data();
 		$this->assertCount( 3, $comments );
 		// 'author_exclude' for both comment authors (2 of 4)
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'author_exclude', array( self::$author_id, self::$subscriber_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$comments = $response->get_data();
 		$this->assertCount( 2, $comments );
 		// 'author_exclude' for both invalid author
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'author_exclude', 'skippy' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		// Unavailable to unauthenticated; defaults to error
 		wp_set_current_user( 0 );
 		$request->set_param( 'author_exclude', array( self::$author_id, self::$subscriber_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_param', $response, 401 );
 	}
 
@@ -636,19 +636,19 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$this->factory->comment->create( $args );
 		// All comments in the database
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 5, $response->get_data() );
 		// Limit to the parent
 		$request->set_param( 'parent', $parent_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 1, $response->get_data() );
 		// Limit to two parents
 		$request->set_param( 'parent', array( $parent_id, $parent_id2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// Invalid parent should error
 		$request->set_param( 'parent', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -665,19 +665,19 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$this->factory->comment->create( $args );
 		// All comments in the database
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 5, $response->get_data() );
 		// Exclude this particular parent
 		$request->set_param( 'parent_exclude', $parent_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 4, $response->get_data() );
 		// Exclude both comment parents
 		$request->set_param( 'parent_exclude', array( $parent_id, $parent_id2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 3, $response->get_data() );
 		// Invalid parent id should error
 		$request->set_param( 'parent_exclude', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -696,11 +696,11 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$this->factory->comment->create( $args );
 		// 3 comments, plus 1 created in construct
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 4, $response->get_data() );
 		// One matching comments
 		$request->set_param( 'search', 'foo' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $id1, $data[0]['id'] );
@@ -718,7 +718,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 			);
 		}
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/comments' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 50, $headers['X-WP-Total'] );
 		$this->assertEquals( 5, $headers['X-WP-TotalPages'] );
@@ -738,7 +738,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -757,7 +757,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		// Last page
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'page', 6 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -771,7 +771,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		// Out of bounds
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'page', 8 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -788,7 +788,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'after', rand_str() );
 		$request->set_param( 'before', rand_str() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -815,7 +815,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$request->set_param( 'after', '2016-01-15T00:00:00Z' );
 		$request->set_param( 'before', '2016-01-17T00:00:00Z' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $comment2, $data[0]['id'] );
@@ -824,7 +824,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_get_item() {
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%d', self::$approved_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -840,7 +840,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -850,7 +850,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_get_comment_author_avatar_urls() {
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%d', self::$approved_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertArrayHasKey( 24, $data['author_avatar_urls'] );
@@ -868,7 +868,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_get_comment_invalid_id() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_id', $response, 404 );
 	}
 
@@ -876,7 +876,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', self::$approved_id ) );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
@@ -890,7 +890,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 		$request    = new WP_REST_Request( 'GET', '/wp/v2/comments/' . $comment_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
 	}
 
@@ -904,7 +904,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 		$request    = new WP_REST_Request( 'GET', '/wp/v2/comments/' . $comment_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
 	}
 
@@ -913,7 +913,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%d', self::$hold_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 401 );
 	}
 
@@ -922,7 +922,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%d', self::$hold_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -945,7 +945,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', $comment_id_1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertArrayHasKey( 'children', $response->get_links() );
 	}
@@ -960,7 +960,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', $comment_id_1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertArrayNotHasKey( 'children', $response->get_links() );
 	}
@@ -973,7 +973,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 		$password_comment = $this->factory->comment->create( $args );
 		$request          = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', $password_comment ) );
-		$response         = $this->server->dispatch( $request );
+		$response         = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 403 );
 	}
 
@@ -992,7 +992,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', $password_comment ) );
 		$request->set_param( 'password', 'toomanysecrets' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -1012,7 +1012,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data = $response->get_data();
@@ -1083,7 +1083,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		if ( isset( $params['date_gmt'] ) ) {
 			$request->set_param( 'date_gmt', $params['date_gmt'] );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		update_option( 'timezone_string', '' );
 
@@ -1117,7 +1117,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data        = $response->get_data();
@@ -1142,7 +1142,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'test_rest_premade_error', $response, 418 );
 	}
@@ -1165,7 +1165,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_comment_author_data_required', $response, 400 );
 	}
@@ -1185,7 +1185,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_comment_author_data_required', $response, 400 );
 	}
@@ -1204,7 +1204,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_author_data_required', $response, 400 );
 	}
 
@@ -1223,7 +1223,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_author_data_required', $response, 400 );
 	}
 
@@ -1240,7 +1240,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
@@ -1262,12 +1262,12 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_content_invalid', $response, 400 );
 
 		$params['content'] = '';
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_content_invalid', $response, 400 );
 	}
 
@@ -1287,7 +1287,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -1313,7 +1313,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data = $response->get_data();
@@ -1339,7 +1339,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data = $response->get_data();
@@ -1350,7 +1350,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		// Make sure the new comment is present in the collection.
 		$collection = new WP_REST_Request( 'GET', '/wp/v2/comments' );
 		$collection->set_param( 'post', $post_id );
-		$collection_response = $this->server->dispatch( $collection );
+		$collection_response = rest_get_server()->dispatch( $collection );
 		$collection_data     = $collection_response->get_data();
 		$this->assertEquals( $comment_id, $collection_data[0]['id'] );
 	}
@@ -1377,7 +1377,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_comment_type', $response, 400 );
 	}
 
@@ -1399,7 +1399,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -1425,7 +1425,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 201, $response->get_status() );
 		$data = $response->get_data();
@@ -1454,7 +1454,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 201, $response->get_status() );
 		$data = $response->get_data();
@@ -1479,7 +1479,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_comment_invalid_author', $response, 403 );
 	}
@@ -1499,7 +1499,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -1520,7 +1520,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_comment_invalid_status', $response, 403 );
 	}
@@ -1544,7 +1544,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data = $response->get_data();
@@ -1569,7 +1569,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'user_agent', 'Mozilla/4.0 (compatible; MSIE 5.5; AOL 4.0; Windows 95)' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data = $response->get_data();
@@ -1593,7 +1593,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response    = $this->server->dispatch( $request );
+		$response    = rest_get_server()->dispatch( $request );
 		$data        = $response->get_data();
 		$new_comment = get_comment( $data['id'] );
 		$this->assertEquals( '127.0.0.3', $new_comment->comment_author_IP );
@@ -1615,7 +1615,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -1632,7 +1632,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_author_ip', $response, 403 );
 	}
 
@@ -1649,7 +1649,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request                = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response    = $this->server->dispatch( $request );
+		$response    = rest_get_server()->dispatch( $request );
 		$data        = $response->get_data();
 		$new_comment = get_comment( $data['id'] );
 		$this->assertEquals( '127.0.0.2', $new_comment->comment_author_IP );
@@ -1669,7 +1669,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_comment_invalid_post_id', $response, 403 );
 	}
@@ -1688,7 +1688,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_post_id', $response, 403 );
 	}
 
@@ -1708,7 +1708,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_post_id', $response, 403 );
 	}
 
@@ -1727,7 +1727,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_comment_draft_post', $response, 403 );
 	}
@@ -1747,7 +1747,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_comment_trash_post', $response, 403 );
 	}
@@ -1767,7 +1767,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_read_post', $response, 403 );
 	}
@@ -1787,7 +1787,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read_post', $response, 403 );
 	}
 
@@ -1812,7 +1812,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 409, $response->get_status() );
 	}
@@ -1832,7 +1832,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 403, $response->get_status() );
 	}
@@ -1843,7 +1843,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		add_filter( 'rest_allow_anonymous_comments', '__return_true' );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
 		$request->set_param( 'post', self::$post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 401, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'rest_comment_login_required', $data['code'] );
@@ -1862,7 +1862,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_author_invalid', $response, 400 );
 	}
 
@@ -1880,7 +1880,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$result = $response->get_data();
 		$this->assertSame( self::$author_id, $result['author'] );
@@ -1904,7 +1904,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$params = array(
@@ -1919,7 +1919,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 400, $response->get_status() );
 	}
 
@@ -1943,7 +1943,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		remove_filter( 'rest_allow_anonymous_comments', array( $this, 'anonymous_comments_callback_null' ), 10, 2 );
 
@@ -1968,7 +1968,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_author_column_length', $response, 400 );
 	}
@@ -1991,7 +1991,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_author_email_column_length', $response, 400 );
 	}
@@ -2014,7 +2014,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_author_url_column_length', $response, 400 );
 	}
@@ -2037,7 +2037,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_content_column_length', $response, 400 );
 	}
@@ -2056,7 +2056,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_read_post', $response, 403 );
 	}
@@ -2076,7 +2076,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 	}
 
@@ -2099,7 +2099,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$comment = $response->get_data();
@@ -2132,7 +2132,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		if ( isset( $params['date_gmt'] ) ) {
 			$request->set_param( 'date_gmt', $params['date_gmt'] );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		update_option( 'timezone_string', '' );
 
@@ -2158,13 +2158,13 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->set_param( 'author_email', 'another@email.com' );
 
 		// Sending a request without content is fine.
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		// Sending a request with empty comment is not fine.
 		$request->set_param( 'author_email', 'yetanother@email.com' );
 		$request->set_param( 'content', '' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_content_invalid', $response, 400 );
 	}
 
@@ -2177,10 +2177,10 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		// Run twice to make sure that the update still succeeds even if no DB
 		// rows are updated.
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -2201,7 +2201,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$comment = $response->get_data();
@@ -2228,7 +2228,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$comment = $response->get_data();
@@ -2249,7 +2249,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$comment = $response->get_data();
@@ -2272,7 +2272,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -2291,7 +2291,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -2309,7 +2309,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -2328,7 +2328,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -2345,7 +2345,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/comments/%d', self::$approved_id ) );
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		$data = $response->get_data();
@@ -2362,7 +2362,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_type', $response, 404 );
 	}
 
@@ -2378,7 +2378,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -2399,7 +2399,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -2415,7 +2415,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -2429,7 +2429,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_id', $response, 404 );
 	}
 
@@ -2439,7 +2439,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/comments/%d', self::$approved_id ) );
 		$request->set_param( 'post', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_post_id', $response, 403 );
 	}
 
@@ -2453,7 +2453,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 401 );
 	}
 
@@ -2475,7 +2475,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 403 );
 	}
 
@@ -2499,7 +2499,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		// Check if comment 1 does not have the child link.
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', $comment_id_1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertArrayNotHasKey( 'children', $response->get_links() );
 
@@ -2507,12 +2507,12 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/comments/%s', $child_comment ) );
 		$request->set_param( 'parent', $comment_id_1 );
 		$request->set_param( 'content', rand_str() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		// Check if comment 1 now has the child link.
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', $comment_id_1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertArrayHasKey( 'children', $response->get_links() );
 	}
@@ -2531,7 +2531,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_author_column_length', $response, 400 );
 	}
@@ -2550,7 +2550,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_author_email_column_length', $response, 400 );
 	}
@@ -2569,7 +2569,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_author_url_column_length', $response, 400 );
 	}
@@ -2587,7 +2587,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'comment_content_column_length', $response, 400 );
 	}
@@ -2600,7 +2600,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		foreach ( $input as $name => $value ) {
 			$request->set_param( $name, $value );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -2626,7 +2626,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		// FIXME at least one value must change, or update fails
 		// See https://core.trac.wordpress.org/ticket/38700
 		$request->set_param( 'author_ip', '127.0.0.2' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -2750,7 +2750,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/comments/%d', $comment_id ) );
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -2770,7 +2770,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/comments/%d', $comment_id ) );
 		$request['force'] = true;
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertTrue( $data['deleted'] );
@@ -2788,10 +2788,10 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 			)
 		);
 		$request    = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/comments/%d', $comment_id ) );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data     = $response->get_data();
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_already_trashed', $response, 410 );
 	}
 
@@ -2800,7 +2800,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/comments/%d', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_comment_invalid_id', $response, 404 );
 	}
 
@@ -2809,7 +2809,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/comments/%d', self::$approved_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_delete', $response, 403 );
 	}
 
@@ -2833,19 +2833,19 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		$request  = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/comments/%s', $child_comment ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		// Verify children link is gone.
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/comments/%s', $comment_id_1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertArrayNotHasKey( 'children', $response->get_links() );
 	}
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/comments' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 17, count( $properties ) );
@@ -2877,7 +2877,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_get_item_schema_show_avatar() {
 		update_option( 'show_avatars', false );
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/users' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 
@@ -2903,7 +2903,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/comments' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
@@ -2911,7 +2911,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/comments/' . self::$approved_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments/' . self::$approved_id );
@@ -2923,7 +2923,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		wp_set_current_user( 1 );
-		$this->server->dispatch( $request );
+		rest_get_server()->dispatch( $request );
 		$this->assertEquals( 123, get_comment_meta( self::$approved_id, 'my_custom_int', true ) );
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/comments' );
@@ -2936,7 +2936,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 123, $response->data['my_custom_int'] );
 
@@ -2971,7 +2971,7 @@ class WP_Test_REST_Comments_Controller extends WP_Test_REST_Controller_Testcase
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
diff --git a/tests/phpunit/tests/rest-api/rest-pages-controller.php b/tests/phpunit/tests/rest-api/rest-pages-controller.php
index 6d04370885..e64096140f 100644
--- a/tests/phpunit/tests/rest-api/rest-pages-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-pages-controller.php
@@ -37,7 +37,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/pages', $routes );
 		$this->assertCount( 2, $routes['/wp/v2/pages'] );
 		$this->assertArrayHasKey( '/wp/v2/pages/(?P<id>[\d]+)', $routes );
@@ -47,14 +47,14 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/pages' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$page_id  = $this->factory->post->create( array( 'post_type' => 'page' ) );
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/pages/' . $page_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -62,7 +62,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_registered_query_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/pages' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -104,7 +104,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/pages' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $id1, $data[0]['id'] );
@@ -126,18 +126,18 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		// No parent
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/pages' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		// Filter to parent
 		$request->set_param( 'parent', $id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $id2, $data[0]['id'] );
 		// Invalid parent should fail
 		$request->set_param( 'parent', 'some-slug' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -170,12 +170,12 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		// No parent
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/pages' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 4, count( $data ) );
 		// Filter to parents
 		$request->set_param( 'parent', array( $id1, $id3 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEqualSets( array( $id2, $id4 ), wp_list_pluck( $data, 'id' ) );
@@ -197,18 +197,18 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		// No parent
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/pages' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		// Filter to parent
 		$request->set_param( 'parent_exclude', $id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $id1, $data[0]['id'] );
 		// Invalid parent_exclude should error
 		$request->set_param( 'parent_exclude', 'some-slug' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -242,19 +242,19 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		// No parent
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/pages' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEqualSets( array( $id1, $id2, $id3, $id4 ), wp_list_pluck( $data, 'id' ) );
 		// Filter to menu_order
 		$request->set_param( 'menu_order', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEqualSets( array( $id4 ), wp_list_pluck( $data, 'id' ) );
 		// Order by menu order
 		$request = new WP_REST_Request( 'GET', '/wp/v2/pages' );
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'orderby', 'menu_order' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $id1, $data[0]['id'] );
 		$this->assertEquals( $id4, $data[1]['id'] );
@@ -263,21 +263,21 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// Invalid menu_order should fail
 		$request = new WP_REST_Request( 'GET', '/wp/v2/pages' );
 		$request->set_param( 'menu_order', 'top-first' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
 	public function test_get_items_min_max_pages_query() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/pages' );
 		$request->set_param( 'per_page', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		$data = $response->get_data();
 		// Safe format for 4.4 and 4.5 https://core.trac.wordpress.org/ticket/35028
 		$first_error = array_shift( $data['data']['params'] );
 		$this->assertContains( 'per_page must be between 1 (inclusive) and 100 (inclusive)', $first_error );
 		$request->set_param( 'per_page', 101 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		$data        = $response->get_data();
 		$first_error = array_shift( $data['data']['params'] );
@@ -301,12 +301,12 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/pages' );
 		$request->set_param( 'status', 'draft' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
 		// But they are accessible to authorized users
 		wp_set_current_user( self::$editor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $draft_id, $data[0]['id'] );
@@ -316,7 +316,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/pages' );
 		$request->set_param( 'after', rand_str() );
 		$request->set_param( 'before', rand_str() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -342,7 +342,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/pages' );
 		$request->set_param( 'after', '2016-01-15T00:00:00Z' );
 		$request->set_param( 'before', '2016-01-17T00:00:00Z' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $post2, $data[0]['id'] );
@@ -355,7 +355,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	public function test_get_item_invalid_post_type() {
 		$post_id  = $this->factory->post->create();
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/pages/' . $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
@@ -373,7 +373,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -396,7 +396,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 201, $response->get_status() );
 
@@ -419,7 +419,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 400 );
 	}
@@ -439,7 +439,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/pages/%d', $page_id ) );
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
@@ -465,7 +465,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'per_page' => 4,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -497,7 +497,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'menu_order' => 1,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( 1, $new_data['menu_order'] );
@@ -521,7 +521,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'menu_order' => 0,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( 0, $new_data['menu_order'] );
@@ -545,7 +545,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'parent' => $page_id1,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( $page_id1, $new_data['parent'] );
 	}
@@ -569,7 +569,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'parent' => 0,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( 0, $new_data['parent'] );
 	}
@@ -583,7 +583,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/pages/%d', $page_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertEquals( '', $data['content']['rendered'] );
@@ -605,7 +605,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$page    = get_post( $page_id );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/pages/%d', $page_id ) );
 		$request->set_param( 'password', '$inthebananastand' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertEquals( wpautop( $page->post_content ), $data['content']['rendered'] );
@@ -625,7 +625,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$page    = get_post( $page_id );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/pages/%d', $page_id ) );
 		$request->set_param( 'password', 'wrongpassword' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_incorrect_password', $response, 403 );
 	}
@@ -640,7 +640,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/pages/%d', $page_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( '', $data['content']['rendered'] );
 		$this->assertTrue( $data['content']['protected'] );
@@ -650,7 +650,7 @@ class WP_Test_REST_Pages_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/pages' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 22, count( $properties ) );
diff --git a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
index dc7c72ed8f..05685791ad 100644
--- a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
+++ b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
@@ -122,8 +122,8 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 
 		/** @var WP_REST_Server $wp_rest_server */
 		global $wp_rest_server;
-		$this->server = $wp_rest_server = new Spy_REST_Server;
-		do_action( 'rest_api_init' );
+		$wp_rest_server = new Spy_REST_Server;
+		do_action( 'rest_api_init', $wp_rest_server );
 	}
 
 	protected function grant_write_permission() {
@@ -140,7 +140,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		add_post_meta( self::$post_id, 'test_single', 'testvalue' );
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -159,7 +159,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		add_post_meta( self::$post_id, 'test_multi', 'value1' );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -171,7 +171,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		// Check after an update.
 		add_post_meta( self::$post_id, 'test_multi', 'value2' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$meta = (array) $data['meta'];
@@ -186,7 +186,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		add_post_meta( self::$post_id, 'test_unregistered', 'value1' );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -201,7 +201,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		add_post_meta( self::$post_id, 'test_no_rest', 'for_the_wicked' );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -216,7 +216,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		add_post_meta( self::$post_id, 'test_rest_disabled', 'sleepless_nights' );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -249,15 +249,15 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 
 		/** @var WP_REST_Server $wp_rest_server */
 		global $wp_rest_server;
-		$this->server = $wp_rest_server = new Spy_REST_Server;
-		do_action( 'rest_api_init' );
+		$wp_rest_server = new Spy_REST_Server;
+		do_action( 'rest_api_init', $wp_rest_server );
 
 		add_post_meta( self::$post_id, 'test_string', 42 );
 		add_post_meta( self::$post_id, 'test_number', '42' );
 		add_post_meta( self::$post_id, 'test_bool', 1 );
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -280,7 +280,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		add_post_meta( self::$post_id, 'test_custom_name', 'janet' );
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -310,7 +310,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_single', false );
@@ -342,7 +342,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_single', true );
@@ -370,7 +370,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 401 );
 
 		// Check that the value wasn't actually updated.
@@ -392,7 +392,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_update', $response, 403 );
 		$this->assertEmpty( get_post_meta( self::$post_id, 'test_bad_auth', false ) );
 	}
@@ -420,7 +420,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$wpdb->suppress_errors = true;
 		add_filter( 'query', array( $this, 'error_insert_query' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'query', array( $this, 'error_insert_query' ) );
 		$wpdb->show_errors = true;
 
@@ -441,7 +441,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEmpty( get_post_meta( self::$post_id, 'test_invalid_type', false ) );
 	}
 
@@ -460,7 +460,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_multi', false );
@@ -476,7 +476,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		);
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_multi', false );
@@ -504,7 +504,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_multi', false );
@@ -532,7 +532,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 401 );
 
 		$meta = get_post_meta( self::$post_id, 'test_multi', false );
@@ -558,7 +558,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -581,7 +581,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -604,7 +604,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, $data['meta']['my_meta_key'] );
 	}
@@ -628,7 +628,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array( 1, 2, 3 ), $data['meta']['my_meta_key'] );
 	}
@@ -648,7 +648,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_update', $response, 403 );
 		$this->assertEmpty( get_post_meta( self::$post_id, 'test_bad_auth_multi', false ) );
 	}
@@ -676,7 +676,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$wpdb->suppress_errors = true;
 		add_filter( 'query', array( $this, 'error_insert_query' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'query', array( $this, 'error_insert_query' ) );
 		$wpdb->show_errors = true;
 
@@ -701,7 +701,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_custom_schema', false );
@@ -730,7 +730,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_custom_schema_multi', false );
@@ -746,7 +746,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		);
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_custom_schema_multi', false );
@@ -774,7 +774,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_custom_name', false );
@@ -803,7 +803,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_custom_name_multi', false );
@@ -819,7 +819,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		);
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_custom_name_multi', false );
@@ -846,7 +846,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
@@ -876,7 +876,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
 		// The meta value should not have changed.
@@ -911,7 +911,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$wpdb->suppress_errors = true;
 		add_filter( 'query', array( $this, 'error_delete_query' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'query', array( $this, 'error_delete_query' ) );
 		$wpdb->show_errors = true;
 
@@ -934,7 +934,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_single', false );
@@ -959,7 +959,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_delete', $response, 403 );
 
 		$meta = get_post_meta( self::$post_id, 'test_bad_auth', true );
@@ -991,7 +991,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$wpdb->suppress_errors = true;
 		add_filter( 'query', array( $this, 'error_delete_query' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'query', array( $this, 'error_delete_query' ) );
 		$wpdb->show_errors = true;
 
@@ -1013,7 +1013,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'POST', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_body_params( $data );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$meta = get_post_meta( self::$post_id, 'test_custom_name', false );
@@ -1022,7 +1022,7 @@ class WP_Test_REST_Post_Meta_Fields extends WP_Test_REST_TestCase {
 
 	public function test_get_schema() {
 		$request  = new WP_REST_Request( 'OPTIONS', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data   = $response->get_data();
 		$schema = $data['schema'];
diff --git a/tests/phpunit/tests/rest-api/rest-post-statuses-controller.php b/tests/phpunit/tests/rest-api/rest-post-statuses-controller.php
index 970754d49b..7d123b9c61 100644
--- a/tests/phpunit/tests/rest-api/rest-post-statuses-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-post-statuses-controller.php
@@ -12,7 +12,7 @@
 class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/statuses', $routes );
 		$this->assertArrayHasKey( '/wp/v2/statuses/(?P<status>[\w-]+)', $routes );
 	}
@@ -20,13 +20,13 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/statuses' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'embed', 'view', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/statuses/publish' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'embed', 'view', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -34,7 +34,7 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 
 	public function test_get_items() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/statuses' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$statuses = get_post_stati( array( 'public' => true ), 'objects' );
@@ -47,7 +47,7 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 		wp_set_current_user( $user_id );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/statuses' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertEquals( 6, count( $data ) );
@@ -66,7 +66,7 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 	public function test_get_items_unauthorized_context() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/statuses' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_view', $response, 401 );
 	}
 
@@ -75,20 +75,20 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 		wp_set_current_user( $user_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/statuses/publish' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_post_status_object_response( $response );
 	}
 
 	public function test_get_item_invalid_status() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/statuses/invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_status_invalid', $response, 404 );
 	}
 
 	public function test_get_item_invalid_access() {
 		wp_set_current_user( 0 );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/statuses/draft' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read_status', $response, 401 );
 	}
 
@@ -97,28 +97,28 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 		wp_set_current_user( $user_id );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/statuses/inherit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read_status', $response, 403 );
 	}
 
 	public function test_create_item() {
 		/** Post statuses can't be created */
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/statuses' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
 	public function test_update_item() {
 		/** Post statuses can't be updated */
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/statuses/draft' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
 	public function test_delete_item() {
 		/** Post statuses can't be deleted */
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/statuses/draft' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
@@ -133,7 +133,7 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/statuses' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 7, count( $properties ) );
@@ -165,7 +165,7 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/statuses' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
@@ -173,7 +173,7 @@ class WP_Test_REST_Post_Statuses_Controller extends WP_Test_REST_Controller_Test
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/statuses/publish' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		global $wp_rest_additional_fields;
diff --git a/tests/phpunit/tests/rest-api/rest-post-types-controller.php b/tests/phpunit/tests/rest-api/rest-post-types-controller.php
index 166e789a66..dfb233bf2e 100644
--- a/tests/phpunit/tests/rest-api/rest-post-types-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-post-types-controller.php
@@ -12,7 +12,7 @@
 class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/types', $routes );
 		$this->assertArrayHasKey( '/wp/v2/types/(?P<type>[\w-]+)', $routes );
 	}
@@ -20,13 +20,13 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/types' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'edit', 'embed' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/types/post' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'edit', 'embed' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -34,7 +34,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_items() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/types' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data       = $response->get_data();
 		$post_types = get_post_types( array( 'show_in_rest' => true ), 'objects' );
@@ -50,13 +50,13 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/types' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_view', $response, 401 );
 	}
 
 	public function test_get_item() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/types/post' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_post_type_object_response( 'view', $response );
 		$data = $response->get_data();
 		$this->assertEquals( array( 'category', 'post_tag' ), $data['taxonomies'] );
@@ -64,7 +64,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_item_page() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/types/page' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_post_type_object_response( 'view', $response, 'page' );
 		$data = $response->get_data();
 		$this->assertEquals( array(), $data['taxonomies'] );
@@ -72,7 +72,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_item_invalid_type() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/types/invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_type_invalid', $response, 404 );
 	}
 
@@ -81,7 +81,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( $editor_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/types/post' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_post_type_object_response( 'edit', $response );
 	}
 
@@ -89,28 +89,28 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/types/post' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
 	public function test_create_item() {
 		/** Post types can't be created */
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/types' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
 	public function test_update_item() {
 		/** Post types can't be updated */
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/types/post' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
 	public function test_delete_item() {
 		/** Post types can't be deleted */
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/types/post' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
@@ -125,7 +125,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/types' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 9, count( $properties ) );
@@ -159,7 +159,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/types/schema' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
@@ -167,7 +167,7 @@ class WP_Test_REST_Post_Types_Controller extends WP_Test_REST_Controller_Testcas
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/types/post' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		global $wp_rest_additional_fields;
diff --git a/tests/phpunit/tests/rest-api/rest-posts-controller.php b/tests/phpunit/tests/rest-api/rest-posts-controller.php
index b6cb4ce074..bc820a8796 100644
--- a/tests/phpunit/tests/rest-api/rest-posts-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-posts-controller.php
@@ -110,7 +110,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 
 		$this->assertArrayHasKey( '/wp/v2/posts', $routes );
 		$this->assertCount( 2, $routes['/wp/v2/posts'] );
@@ -121,13 +121,13 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts/' . self::$post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -135,7 +135,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_registered_query_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -167,7 +167,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_registered_get_item_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -176,7 +176,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_get_items() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_get_posts_response( $response );
 	}
@@ -193,7 +193,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'author' => REST_TESTS_IMPOSSIBLY_HIGH_NUMBER,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEmpty( $response->get_data() );
 		$this->assertEquals( 200, $response->get_status() );
@@ -204,13 +204,13 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->factory->post->create( array( 'post_author' => self::$author_id ) );
 		// All 3 posts
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 3, count( $response->get_data() ) );
 		// 2 of 3 posts
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'author', array( self::$editor_id, self::$author_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -218,7 +218,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// 1 of 3 posts
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'author', self::$editor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
@@ -230,13 +230,13 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->factory->post->create( array( 'post_author' => self::$author_id ) );
 		// All 3 posts
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 3, count( $response->get_data() ) );
 		// 1 of 3 posts
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'author_exclude', array( self::$editor_id, self::$author_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
@@ -245,7 +245,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// 2 of 3 posts
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'author_exclude', self::$editor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -254,7 +254,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// invalid author_exclude errors
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'author_exclude', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -265,14 +265,14 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		// Orderby=>desc
 		$request->set_param( 'include', array( $id1, $id3 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id3, $data[0]['id'] );
 		$this->assertPostsOrderedBy( '{posts}.post_date DESC' );
 		// Orderby=>include
 		$request->set_param( 'orderby', 'include' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id1, $data[0]['id'] );
@@ -280,7 +280,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// Invalid include should error
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'include', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -308,7 +308,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'include', array( $id1, $id2, $id3 ) );
 		$request->set_param( 'orderby', 'author' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -332,7 +332,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'include', array( $id1, $id2, $id3 ) );
 		$request->set_param( 'orderby', 'modified' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -368,7 +368,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'include', array( $id1, $id2, $id3 ) );
 		$request->set_param( 'orderby', 'parent' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -385,25 +385,25 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$id1      = $this->factory->post->create( array( 'post_status' => 'publish' ) );
 		$id2      = $this->factory->post->create( array( 'post_status' => 'publish' ) );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertTrue( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 
 		$request->set_param( 'exclude', array( $id2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertFalse( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 
 		$request->set_param( 'exclude', "$id2" );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertFalse( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 
 		$request->set_param( 'exclude', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -418,11 +418,11 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 7, count( $response->get_data() ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'search', 'Search Result' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( 'Search Result', $data[0]['title']['rendered'] );
@@ -443,7 +443,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'slug', 'apple' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
@@ -471,7 +471,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'slug', array( 'banana', 'peach' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -504,7 +504,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'slug', 'apple,banana' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -521,17 +521,17 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->factory->post->create( array( 'post_status' => 'draft' ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'status', 'publish' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 1, count( $response->get_data() ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'status', 'draft' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		wp_set_current_user( self::$editor_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'status', 'draft' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 1, count( $response->get_data() ) );
 	}
@@ -547,7 +547,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'context', 'edit' );
 		$request->set_param( 'status', 'draft,private' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -570,7 +570,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'context', 'edit' );
 		$request->set_param( 'status', array( 'draft', 'pending' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
@@ -586,7 +586,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'context', 'edit' );
 		$request->set_param( 'status', array( 'draft', 'nonsense' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -594,7 +594,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'status', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -607,7 +607,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( 0 );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -646,24 +646,24 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'search', 'Apple' );
 		// order defaults to 'desc'
 		$request->set_param( 'orderby', 'title' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'Apple Sauce', $data[0]['title']['rendered'] );
 		$this->assertPostsOrderedBy( '{posts}.post_title DESC' );
 		// order=>asc
 		$request->set_param( 'order', 'asc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'Apple Cobbler', $data[0]['title']['rendered'] );
 		$this->assertPostsOrderedBy( '{posts}.post_title ASC' );
 		// order=>asc,id should fail
 		$request->set_param( 'order', 'asc,id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		// orderby=>content should fail (invalid param test)
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'orderby', 'content' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -672,7 +672,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'orderby', 'include' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_orderby_include_missing_include', $response, 400 );
 	}
@@ -701,7 +701,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'orderby', 'id' );
 		$request->set_param( 'include', array( $id1, $id2, $id3 ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		// Default ORDER is DESC.
@@ -731,7 +731,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'orderby', 'slug' );
 		$request->set_param( 'include', array( $id1, $id2 ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		// Default ORDER is DESC.
@@ -756,7 +756,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'orderby', 'include_slugs' );
 		$request->set_param( 'slug', array( 'taco', 'chalupa', 'burrito' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 'taco', $data[0]['slug'] );
@@ -782,7 +782,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'orderby', 'relevance' );
 		$request->set_param( 'search', 'relevant' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertCount( 2, $data );
@@ -809,7 +809,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'orderby', 'relevance' );
 		$request->set_param( 'search', 'relevant content' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertCount( 2, $data );
@@ -821,7 +821,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	public function test_get_items_with_orderby_relevance_missing_search() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'orderby', 'relevance' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_search_term_defined', $response, 400 );
 	}
 
@@ -832,19 +832,19 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$id4     = $this->factory->post->create( array( 'post_status' => 'publish' ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'offset', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 3, $response->get_data() );
 		// 'offset' works with 'per_page'
 		$request->set_param( 'per_page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// 'offset' takes priority over 'page'
 		$request->set_param( 'page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// Invalid 'offset' should error
 		$request->set_param( 'offset', 'moreplease' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -859,7 +859,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'tags', array( $tag['term_id'] ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $id1, $data[0]['id'] );
@@ -876,7 +876,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'tags_exclude', array( $tag['term_id'] ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 3, $data );
 		$this->assertEquals( $id4, $data[0]['id'] );
@@ -900,11 +900,11 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'tags', array( $tag['term_id'] ) );
 		$request->set_param( 'categories', array( $category['term_id'] ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 1, $response->get_data() );
 
 		$request->set_param( 'tags', array( 'my-tag' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -924,13 +924,13 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'tags', array( $tag['term_id'] ) );
 		$request->set_param( 'categories_exclude', array( $category['term_id'] ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $id2, $data[0]['id'] );
 
 		$request->set_param( 'tags_exclude', array( 'my-tag' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -943,7 +943,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'sticky', true );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 1, $response->get_data() );
 
 		$posts = $response->get_data();
@@ -951,7 +951,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->assertEquals( $id2, $post['id'] );
 
 		$request->set_param( 'sticky', 'nothanks' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -966,7 +966,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'sticky', true );
 		$request->set_param( 'include', array( $id1 ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 0, $response->get_data() );
 
 		// FIXME Since this request returns zero posts, the query is executed twice.
@@ -981,7 +981,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'sticky', true );
 		$request->set_param( 'include', array( $id1 ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertCount( 1, $response->get_data() );
 
@@ -1000,7 +1000,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'sticky', true );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 0, $response->get_data() );
 
 		// FIXME Since this request returns zero posts, the query is executed twice.
@@ -1019,7 +1019,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'sticky', true );
 		$request->set_param( 'include', array( $id1 ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 0, $response->get_data() );
 
 		// FIXME Since this request returns zero posts, the query is executed twice.
@@ -1038,7 +1038,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'sticky', false );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 1, $response->get_data() );
 
 		$posts = $response->get_data();
@@ -1059,7 +1059,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'sticky', false );
 		$request->set_param( 'exclude', array( $id3 ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 1, $response->get_data() );
 
 		$posts = $response->get_data();
@@ -1080,7 +1080,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_param( 'sticky', false );
 		$request->set_param( 'exclude', array( $id3 ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 
 		$posts = $response->get_data();
@@ -1101,7 +1101,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			);
 		}
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 50, $headers['X-WP-Total'] );
 		$this->assertEquals( 5, $headers['X-WP-TotalPages'] );
@@ -1120,7 +1120,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -1139,7 +1139,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// Last page
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'page', 6 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -1154,7 +1154,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// Out of bounds
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'page', 8 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertErrorResponse( 'rest_post_invalid_page_number', $response, 400 );
 
@@ -1166,7 +1166,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'page'     => 2,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 11, $headers['X-WP-TotalPages'] );
@@ -1192,12 +1192,12 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$draft_id = $this->factory->post->create( array( 'post_status' => 'draft' ) );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'status', 'draft' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
 		// But they are accessible to authorized users
 		wp_set_current_user( self::$editor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $draft_id, $data[0]['id'] );
@@ -1206,7 +1206,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	public function test_get_items_invalid_per_page() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_query_params( array( 'per_page' => -1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -1217,14 +1217,14 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		// Out of bounds
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'page', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_post_invalid_page_number', $response, 400 );
 	}
 
 	public function test_get_items_invalid_context() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'context', 'banana' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -1232,7 +1232,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'after', rand_str() );
 		$request->set_param( 'before', rand_str() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -1244,7 +1244,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts' );
 		$request->set_param( 'after', '2016-01-15T00:00:00Z' );
 		$request->set_param( 'before', '2016-01-17T00:00:00Z' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( $post2, $data[0]['id'] );
@@ -1252,7 +1252,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_get_items_all_post_formats() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$formats = array_values( get_post_format_slugs() );
@@ -1262,14 +1262,14 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_get_item() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_get_post_response( $response, 'view' );
 	}
 
 	public function test_get_item_links() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$links = $response->get_links();
 
@@ -1312,7 +1312,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_get_item_links_no_author() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$links    = $response->get_links();
 		$this->assertFalse( isset( $links['author'] ) );
 		wp_update_post(
@@ -1322,7 +1322,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$links    = $response->get_links();
 		$this->assertEquals( rest_url( '/wp/v2/users/' . self::$author_id ), $links['author'][0]['href'] );
 	}
@@ -1336,14 +1336,14 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( 0 );
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', $draft_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_forbidden', $response, 401 );
 	}
 
 	public function test_get_post_invalid_id() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
 	}
@@ -1358,7 +1358,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		wp_set_current_user( self::$editor_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_get_posts_response( $response, 'edit' );
 	}
@@ -1371,7 +1371,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'context' => 'edit',
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
@@ -1384,7 +1384,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 				'context' => 'edit',
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
@@ -1397,7 +1397,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', $post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_get_post_response( $response, 'view' );
 
@@ -1420,7 +1420,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$post    = get_post( $post_id );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', $post_id ) );
 		$request->set_param( 'password', '$inthebananastand' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_get_post_response( $response, 'view' );
 
@@ -1441,7 +1441,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$post    = get_post( $post_id );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', $post_id ) );
 		$request->set_param( 'password', 'wrongpassword' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_incorrect_password', $response, 403 );
 	}
@@ -1455,7 +1455,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', $post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->check_get_post_response( $response, 'view' );
 		$this->assertEquals( '', $data['content']['rendered'] );
@@ -1475,7 +1475,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		// Private status
 		wp_update_post(
@@ -1485,7 +1485,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 401, $response->get_status() );
 	}
 
@@ -1494,7 +1494,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_query_params( array( 'context' => 'edit' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_get_post_response( $response, 'edit' );
 	}
@@ -1506,7 +1506,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$params = $this->set_post_data();
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_create_post_response( $response );
 	}
@@ -1597,7 +1597,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		if ( isset( $params['date_gmt'] ) ) {
 			$request->set_param( 'date_gmt', $params['date_gmt'] );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		update_option( 'timezone_string', '' );
 
@@ -1634,7 +1634,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data          = $response->get_data();
 		$post_template = get_page_template_slug( get_post( $data['id'] ) );
@@ -1658,7 +1658,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -1678,7 +1678,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data          = $response->get_data();
 		$post_template = get_page_template_slug( get_post( $data['id'] ) );
@@ -1694,7 +1694,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->add_header( 'content-type', 'application/json' );
 		$params = $this->set_post_data();
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_create_post_response( $response );
 	}
@@ -1709,7 +1709,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_exists', $response, 400 );
 	}
@@ -1728,7 +1728,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		);
 
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data = $response->get_data();
@@ -1751,7 +1751,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( true, $new_data['sticky'] );
@@ -1770,7 +1770,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_assign_sticky', $response, 403 );
 	}
@@ -1785,7 +1785,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_edit_others', $response, 403 );
 	}
@@ -1800,7 +1800,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_create', $response, 401 );
 	}
@@ -1815,7 +1815,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -1839,7 +1839,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -1863,7 +1863,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_publish', $response, 403 );
 	}
@@ -1883,7 +1883,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_publish', $response, 403 );
 	}
@@ -1898,7 +1898,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -1913,7 +1913,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -1931,7 +1931,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -1949,7 +1949,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -1969,7 +1969,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 
 		$data = $response->get_data();
@@ -1995,7 +1995,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
 		$this->assertEquals( $this->attachment_id, $data['featured_media'] );
@@ -2008,7 +2008,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 0, $data['featured_media'] );
 		$this->assertEquals( 0, (int) get_post_thumbnail_id( $new_post->ID ) );
@@ -2024,7 +2024,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_author', $response, 400 );
 	}
@@ -2039,7 +2039,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_edit_others', $response, 403 );
 	}
@@ -2054,7 +2054,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertEquals( 'testing', $data['password'] );
@@ -2070,7 +2070,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 
@@ -2088,7 +2088,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 201, $response->get_status() );
 		$data = $response->get_data();
@@ -2106,7 +2106,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_field', $response, 400 );
 	}
@@ -2121,7 +2121,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -2140,7 +2140,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -2168,7 +2168,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$wpdb->suppress_errors = true;
 		add_filter( 'query', array( $this, 'error_insert_query' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'query', array( $this, 'error_insert_query' ) );
 		$wpdb->show_errors = true;
 
@@ -2185,7 +2185,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -2200,7 +2200,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -2215,7 +2215,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( "Rob O'Rourke's Diary", $new_data['title']['raw'] );
 	}
@@ -2233,7 +2233,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertEquals( array( $category['term_id'] ), $data['categories'] );
@@ -2250,7 +2250,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertEquals( array( $category['term_id'], $category2['term_id'] ), $data['categories'] );
@@ -2268,7 +2268,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertEquals( array(), $data['categories'] );
@@ -2292,7 +2292,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_body_params( $params );
 
 		add_filter( 'map_meta_cap', array( $this, 'revoke_assign_term' ), 10, 4 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'map_meta_cap', array( $this, 'revoke_assign_term' ), 10, 4 );
 
 		$this->assertErrorResponse( 'rest_cannot_assign_term', $response, 403 );
@@ -2312,7 +2312,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$params = $this->set_post_data();
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_update_post_response( $response );
 		$new_data = $response->get_data();
@@ -2335,10 +2335,10 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		// Run twice to make sure that the update still succeeds even if no DB
 		// rows are updated.
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_update_post_response( $response );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_update_post_response( $response );
 	}
 
@@ -2349,7 +2349,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->add_header( 'content-type', 'application/json' );
 		$params = $this->set_post_data();
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_update_post_response( $response );
 		$new_data = $response->get_data();
@@ -2370,7 +2370,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->add_header( 'content-type', 'application/json' );
 		$params = $this->set_raw_post_data();
 		$request->set_body( wp_json_encode( $params ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_update_post_response( $response );
 		$new_data = $response->get_data();
@@ -2394,7 +2394,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		unset( $params['author'] );
 		unset( $params['status'] );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->check_update_post_response( $response );
 	}
@@ -2410,7 +2410,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$params  = $this->set_post_data();
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 403 );
 	}
@@ -2426,7 +2426,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 403 );
 	}
@@ -2435,7 +2435,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( self::$editor_id );
 
 		$request  = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/posts/%d', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
 	}
@@ -2444,7 +2444,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( self::$editor_id );
 
 		$request  = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/pages/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
 	}
@@ -2459,7 +2459,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -2477,7 +2477,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data     = $response->get_data();
 		$new_post = get_post( $data['id'] );
@@ -2495,7 +2495,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -2515,7 +2515,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -2536,7 +2536,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// The readonly modified param should be ignored, request should be a success.
 		$data     = $response->get_data();
@@ -2566,7 +2566,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		if ( isset( $params['date_gmt'] ) ) {
 			$request->set_param( 'date_gmt', $params['date_gmt'] );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		update_option( 'timezone_string', '' );
 
@@ -2593,7 +2593,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -2608,7 +2608,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -2641,7 +2641,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$this->assertEquals( $post->post_date_gmt, '0000-00-00 00:00:00' );
 
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', $post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 
@@ -2650,7 +2650,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/posts/%d', $post_id ) );
 		$request->set_param( 'date', '2016-02-23T13:00:00' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 
@@ -2674,7 +2674,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( 'sample-slug', $new_data['slug'] );
@@ -2692,7 +2692,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( 'test-accented-charaecters', $new_data['slug'] );
@@ -2710,7 +2710,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( true, $new_data['sticky'] );
@@ -2725,7 +2725,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( true, $new_data['sticky'] );
@@ -2743,7 +2743,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( 'An Excerpt', $new_data['excerpt']['raw'] );
 	}
@@ -2758,7 +2758,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( '', $new_data['excerpt']['raw'] );
 	}
@@ -2773,7 +2773,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( 'Some Content', $new_data['content']['raw'] );
 	}
@@ -2788,7 +2788,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( '', $new_data['content']['raw'] );
 	}
@@ -2809,7 +2809,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( '', $data['password'] );
 	}
@@ -2825,7 +2825,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_field', $response, 400 );
 	}
@@ -2842,7 +2842,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_field', $response, 400 );
 	}
@@ -2864,7 +2864,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_field', $response, 400 );
 	}
@@ -2879,7 +2879,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( "Rob O'Rourke's Diary", $new_data['title']['raw'] );
 	}
@@ -2899,7 +2899,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( array( $category['term_id'] ), $new_data['categories'] );
 		$categories_path = '';
@@ -2914,7 +2914,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request = new WP_REST_Request( 'GET', $args['rest_route'] );
 		unset( $args['rest_route'] );
 		$request->set_query_params( $args );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertCount( 1, $data );
 		$this->assertEquals( 'Test Category', $data[0]['name'] );
@@ -2934,7 +2934,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$new_data = $response->get_data();
 		$this->assertEquals( array(), $new_data['categories'] );
 	}
@@ -2957,7 +2957,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$request->set_body_params( $params );
 
 		add_filter( 'map_meta_cap', array( $this, 'revoke_assign_term' ), 10, 4 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'map_meta_cap', array( $this, 'revoke_assign_term' ), 10, 4 );
 
 		$this->assertErrorResponse( 'rest_cannot_assign_term', $response, 403 );
@@ -2983,7 +2983,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data          = $response->get_data();
 		$post_template = get_page_template_slug( get_post( $data['id'] ) );
@@ -3013,7 +3013,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data          = $response->get_data();
 		$post_template = get_page_template_slug( get_post( $data['id'] ) );
@@ -3041,7 +3041,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -3058,7 +3058,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		foreach ( $input as $name => $value ) {
 			$request->set_param( $name, $value );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -3081,7 +3081,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		foreach ( $input as $name => $value ) {
 			$request->set_param( $name, $value );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -3286,7 +3286,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/posts/%d', $post_id ) );
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
@@ -3300,7 +3300,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/posts/%d', $post_id ) );
 		$request['force'] = true;
-		$response         = $this->server->dispatch( $request );
+		$response         = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
@@ -3312,9 +3312,9 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		$post_id = $this->factory->post->create( array( 'post_title' => 'Deleted post' ) );
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/posts/%d', $post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_already_trashed', $response, 410 );
 	}
 
@@ -3322,7 +3322,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( self::$editor_id );
 
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/posts/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
 	}
@@ -3332,7 +3332,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( self::$editor_id );
 
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/posts/' . $page_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_post_invalid_id', $response, 404 );
 	}
@@ -3341,7 +3341,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 		wp_set_current_user( self::$author_id );
 
 		$request  = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_delete', $response, 403 );
 	}
@@ -3355,7 +3355,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 		create_initial_rest_routes();
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertFalse( isset( $routes['/wp/v2/invalid-controller'] ) );
 		_unregister_post_type( 'invalid-controller' );
 
@@ -3363,7 +3363,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 24, count( $properties ) );
@@ -3399,7 +3399,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	public function test_get_post_view_context_properties() {
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_param( 'context', 'view' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$keys     = array_keys( $response->get_data() );
 		sort( $keys );
 
@@ -3437,7 +3437,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$keys     = array_keys( $response->get_data() );
 		sort( $keys );
 
@@ -3474,7 +3474,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 	public function test_get_post_embed_context_properties() {
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/posts/%d', self::$post_id ) );
 		$request->set_param( 'context', 'embed' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$keys     = array_keys( $response->get_data() );
 		sort( $keys );
 
@@ -3495,7 +3495,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 	public function test_status_array_enum_args() {
 		$request         = new WP_REST_Request( 'GET', '/wp/v2' );
-		$response        = $this->server->dispatch( $request );
+		$response        = rest_get_server()->dispatch( $request );
 		$data            = $response->get_data();
 		$list_posts_args = $data['routes']['/wp/v2/posts']['endpoints'][0]['args'];
 		$status_arg      = $list_posts_args['status'];
@@ -3527,7 +3527,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
@@ -3539,7 +3539,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . $post_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/posts/' . $post_id );
@@ -3549,7 +3549,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 123, get_post_meta( $post_id, 'my_custom_int', true ) );
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/posts' );
@@ -3560,7 +3560,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 123, $response->data['my_custom_int'] );
 
@@ -3593,7 +3593,7 @@ class WP_Test_REST_Posts_Controller extends WP_Test_REST_Post_Type_Controller_Te
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
diff --git a/tests/phpunit/tests/rest-api/rest-revisions-controller.php b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
index 1ada841307..c30ab17c85 100644
--- a/tests/phpunit/tests/rest-api/rest-revisions-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
@@ -67,7 +67,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/posts/(?P<parent>[\d]+)/revisions', $routes );
 		$this->assertArrayHasKey( '/wp/v2/posts/(?P<parent>[\d]+)/revisions/(?P<id>[\d]+)', $routes );
 		$this->assertArrayHasKey( '/wp/v2/pages/(?P<parent>[\d]+)/revisions', $routes );
@@ -77,13 +77,13 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts/' . self::$post_id . '/revisions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'edit', 'embed' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_1->ID );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'edit', 'embed' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -92,7 +92,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_get_items() {
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertCount( 2, $data );
@@ -108,32 +108,32 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_get_items_no_permission() {
 		wp_set_current_user( 0 );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 401 );
 		wp_set_current_user( self::$contributor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 403 );
 	}
 
 	public function test_get_items_missing_parent() {
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER . '/revisions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_post_invalid_parent', $response, 404 );
 	}
 
 	public function test_get_items_invalid_parent_post_type() {
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$page_id . '/revisions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_post_invalid_parent', $response, 404 );
 	}
 
 	public function test_get_item() {
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->check_get_revision_response( $response, $this->revision_1 );
 		$fields = array(
@@ -159,7 +159,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$editor_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
 		$request->set_param( 'context', 'embed' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$fields   = array(
 			'author',
 			'date',
@@ -177,24 +177,24 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 401 );
 		wp_set_current_user( self::$contributor_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 403 );
 	}
 
 	public function test_get_item_missing_parent() {
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER . '/revisions/' . $this->revision_id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_post_invalid_parent', $response, 404 );
 	}
 
 	public function test_get_item_invalid_parent_post_type() {
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$page_id . '/revisions/' . $this->revision_id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_post_invalid_parent', $response, 404 );
 	}
 
@@ -202,7 +202,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$editor_id );
 		$request = new WP_REST_Request( 'DELETE', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
 		$request->set_param( 'force', true );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertNull( get_post( $this->revision_id1 ) );
 	}
@@ -211,11 +211,11 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$editor_id );
 
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		// Ensure the revision still exists
@@ -225,21 +225,21 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_delete_item_no_permission() {
 		wp_set_current_user( self::$contributor_id );
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_read', $response, 403 );
 	}
 
 	public function test_prepare_item() {
 		wp_set_current_user( self::$editor_id );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->check_get_revision_response( $response, $this->revision_1 );
 	}
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts/' . self::$post_id . '/revisions' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 12, count( $properties ) );
@@ -259,13 +259,13 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 
 	public function test_create_item() {
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/posts/' . self::$post_id . '/revisions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
 	public function test_update_item() {
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
@@ -288,7 +288,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/posts/' . self::$post_id . '/revisions' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
@@ -298,7 +298,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		global $wp_rest_additional_fields;
@@ -354,7 +354,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_get_item_sets_up_postdata() {
 		wp_set_current_user( self::$editor_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/posts/' . self::$post_id . '/revisions/' . $this->revision_id1 );
-		$this->server->dispatch( $request );
+		rest_get_server()->dispatch( $request );
 
 		$post           = get_post();
 		$parent_post_id = wp_is_post_revision( $post->ID );
diff --git a/tests/phpunit/tests/rest-api/rest-schema-setup.php b/tests/phpunit/tests/rest-api/rest-schema-setup.php
index 99f6b1c55f..2159cde0d4 100644
--- a/tests/phpunit/tests/rest-api/rest-schema-setup.php
+++ b/tests/phpunit/tests/rest-api/rest-schema-setup.php
@@ -20,8 +20,8 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 
 		/** @var WP_REST_Server $wp_rest_server */
 		global $wp_rest_server;
-		$this->server = $wp_rest_server = new Spy_REST_Server;
-		do_action( 'rest_api_init' );
+		$wp_rest_server = new Spy_REST_Server;
+		do_action( 'rest_api_init', $wp_rest_server );
 
 		add_filter( 'pre_http_request', array( $this, 'mock_embed_request' ), 10, 3 );
 	}
@@ -72,7 +72,7 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 	}
 
 	public function test_expected_routes_in_schema() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 
 		$this->assertTrue( is_array( $routes ), '`get_routes` should return an array.' );
 		$this->assertTrue( ! empty( $routes ), 'Routes should not be empty.' );
@@ -373,7 +373,7 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 			if ( isset( $route['args'] ) ) {
 				$request->set_query_params( $route['args'] );
 			}
-			$response = $this->server->dispatch( $request );
+			$response = rest_get_server()->dispatch( $request );
 			$status   = $response->get_status();
 			$data     = $response->get_data();
 
diff --git a/tests/phpunit/tests/rest-api/rest-server.php b/tests/phpunit/tests/rest-api/rest-server.php
index 872e6bcef7..dd4f70b1e3 100644
--- a/tests/phpunit/tests/rest-api/rest-server.php
+++ b/tests/phpunit/tests/rest-api/rest-server.php
@@ -16,7 +16,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		// Reset REST server to ensure only our routes are registered
 		$GLOBALS['wp_rest_server'] = null;
 		add_filter( 'wp_rest_server_class', array( $this, 'filter_wp_rest_server_class' ) );
-		$this->server = rest_get_server();
+		$GLOBALS['wp_rest_server'] = rest_get_server();
 		remove_filter( 'wp_rest_server_class', array( $this, 'filter_wp_rest_server_class' ) );
 	}
 
@@ -45,7 +45,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$response->header( 'Multiple', 'maybe' );
 		$response->header( 'Multiple', 'yes', false );
 
-		$envelope_response = $this->server->envelope_response( $response, false );
+		$envelope_response = rest_get_server()->envelope_response( $response, false );
 
 		// The envelope should still be a response, but with defaults.
 		$this->assertInstanceOf( 'WP_REST_Response', $envelope_response );
@@ -75,7 +75,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		);
 
 		$request  = new WP_REST_Request( 'GET', '/test-ns/test' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 'bar', $request['foo'] );
 	}
@@ -96,7 +96,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$request = new WP_REST_Request( 'GET', '/test-ns/test' );
 		$request->set_query_params( array( 'foo' => 123 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( '123', $request['foo'] );
 	}
@@ -114,7 +114,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$request = new WP_REST_Request( 'GET', '/optional/test' );
 		$request->set_query_params( array() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertInstanceOf( 'WP_REST_Response', $response );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertArrayNotHasKey( 'foo', (array) $request );
@@ -133,7 +133,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			)
 		);
 		$request = new WP_REST_Request( 'GET', '/no-zero/test' );
-		$this->server->dispatch( $request );
+		rest_get_server()->dispatch( $request );
 		$this->assertEquals( array( 'foo' => 'bar' ), $request->get_params() );
 	}
 
@@ -145,7 +145,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			)
 		);
 		$request  = new WP_REST_Request( 'HEAD', '/head-request/test' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -170,13 +170,13 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			)
 		);
 		$request  = new WP_REST_Request( 'HEAD', '/head-request/test' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
 	public function test_url_params_no_numeric_keys() {
 
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test/(?P<data>.*)', array(
 				array(
 					'methods'  => WP_REST_Server::READABLE,
@@ -189,7 +189,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		);
 
 		$request = new WP_REST_Request( 'GET', '/test/some-value' );
-		$this->server->dispatch( $request );
+		rest_get_server()->dispatch( $request );
 		$this->assertEquals( array( 'data' => 'some-value' ), $request->get_params() );
 	}
 
@@ -208,7 +208,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		);
 
 		$request = new WP_REST_Request( 'GET', '/test-ns/test', array() );
-		$result  = $this->server->dispatch( $request );
+		$result  = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 403, $result->get_status() );
 	}
@@ -233,7 +233,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		wp_set_current_user( $editor );
 
-		$result = $this->server->dispatch( $request );
+		$result = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $result->get_status() );
 	}
@@ -254,8 +254,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$request = new WP_REST_Request( 'GET', '/test-ns/test', array() );
 
-		$result = $this->server->dispatch( $request );
-		$result = apply_filters( 'rest_post_dispatch', $result, $this->server, $request );
+		$result = rest_get_server()->dispatch( $request );
+		$result = apply_filters( 'rest_post_dispatch', $result, rest_get_server(), $request );
 
 		$this->assertFalse( $result->get_status() !== 200 );
 
@@ -287,11 +287,11 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$request = new WP_REST_Request( 'GET', '/test-ns/test', array() );
 
-		$result = $this->server->dispatch( $request );
+		$result = rest_get_server()->dispatch( $request );
 
 		$this->assertFalse( $result->get_status() !== 200 );
 
-		$result = apply_filters( 'rest_post_dispatch', $result, $this->server, $request );
+		$result = apply_filters( 'rest_post_dispatch', $result, rest_get_server(), $request );
 
 		$sent_headers = $result->get_headers();
 		$this->assertEquals( $sent_headers['Allow'], 'GET, POST' );
@@ -322,8 +322,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$request = new WP_REST_Request( 'GET', '/test-ns/test', array() );
 
-		$result = $this->server->dispatch( $request );
-		$result = apply_filters( 'rest_post_dispatch', $result, $this->server, $request );
+		$result = rest_get_server()->dispatch( $request );
+		$result = apply_filters( 'rest_post_dispatch', $result, rest_get_server(), $request );
 
 		$this->assertEquals( $result->get_status(), 403 );
 
@@ -347,9 +347,9 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		);
 
 		$request  = new WP_REST_Request( 'OPTIONS', '/test-ns/test' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
-		$result = apply_filters( 'rest_post_dispatch', rest_ensure_response( $response ), $this->server, $request );
+		$result = apply_filters( 'rest_post_dispatch', rest_ensure_response( $response ), rest_get_server(), $request );
 
 		$headers = $result->get_headers();
 
@@ -365,7 +365,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$message = 'Test error message for the API';
 		$error   = new WP_Error( $code, $message );
 
-		$response = $this->server->error_to_response( $error );
+		$response = rest_get_server()->error_to_response( $error );
 		$this->assertInstanceOf( 'WP_REST_Response', $response );
 
 		// Make sure we default to a 500 error.
@@ -382,7 +382,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$message = 'Test error message for the API';
 		$error   = new WP_Error( $code, $message, array( 'status' => 400 ) );
 
-		$response = $this->server->error_to_response( $error );
+		$response = rest_get_server()->error_to_response( $error );
 		$this->assertInstanceOf( 'WP_REST_Response', $response );
 
 		$this->assertEquals( 400, $response->get_status() );
@@ -401,7 +401,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$error    = new WP_Error( $code, $message, array( 'status' => 400 ) );
 		$error->add( $code2, $message2, array( 'status' => 403 ) );
 
-		$response = $this->server->error_to_response( $error );
+		$response = rest_get_server()->error_to_response( $error );
 		$this->assertInstanceOf( 'WP_REST_Response', $response );
 
 		$this->assertEquals( 400, $response->get_status() );
@@ -420,7 +420,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			'message' => 'Message text',
 		);
 		$expected = wp_json_encode( $data );
-		$response = $this->server->json_error( 'wp-api-test-error', 'Message text' );
+		$response = rest_get_server()->json_error( 'wp-api-test-error', 'Message text' );
 
 		$this->assertEquals( $expected, $response );
 	}
@@ -450,7 +450,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$response->add_link( 'self', 'http://example.com/' );
 		$response->add_link( 'alternate', 'http://example.org/', array( 'type' => 'application/xml' ) );
 
-		$data = $this->server->response_to_data( $response, false );
+		$data = rest_get_server()->response_to_data( $response, false );
 		$this->assertArrayHasKey( '_links', $data );
 
 		$self = array(
@@ -467,7 +467,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 	public function test_link_embedding() {
 		// Register our testing route.
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test/embeddable', array(
 				'methods'  => 'GET',
 				'callback' => array( $this, 'embedded_response_callback' ),
@@ -481,7 +481,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		// All others should be embedded.
 		$response->add_link( 'alternate', rest_url( '/test/embeddable' ), array( 'embeddable' => true ) );
 
-		$data = $this->server->response_to_data( $response, true );
+		$data = rest_get_server()->response_to_data( $response, true );
 		$this->assertArrayHasKey( '_embedded', $data );
 
 		$alternate = $data['_embedded']['alternate'];
@@ -500,7 +500,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$response = new WP_REST_Response();
 		$response->add_link( 'https://api.w.org/term', 'http://example.com/' );
 
-		$data  = $this->server->response_to_data( $response, false );
+		$data  = rest_get_server()->response_to_data( $response, false );
 		$links = $data['_links'];
 
 		$this->assertArrayHasKey( 'wp:term', $links );
@@ -513,7 +513,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		add_filter( 'rest_response_link_curies', array( $this, 'add_custom_curie' ) );
 
-		$data  = $this->server->response_to_data( $response, false );
+		$data  = rest_get_server()->response_to_data( $response, false );
 		$links = $data['_links'];
 
 		$this->assertArrayHasKey( 'my_site:contact', $links );
@@ -540,7 +540,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 	 */
 	public function test_link_embedding_self() {
 		// Register our testing route.
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test/embeddable', array(
 				'methods'  => 'GET',
 				'callback' => array( $this, 'embedded_response_callback' ),
@@ -551,7 +551,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		// 'self' should be ignored.
 		$response->add_link( 'self', rest_url( '/test/notembeddable' ), array( 'embeddable' => true ) );
 
-		$data = $this->server->response_to_data( $response, true );
+		$data = rest_get_server()->response_to_data( $response, true );
 
 		$this->assertArrayNotHasKey( '_embedded', $data );
 	}
@@ -561,7 +561,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 	 */
 	public function test_link_embedding_params() {
 		// Register our testing route.
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test/embeddable', array(
 				'methods'  => 'GET',
 				'callback' => array( $this, 'embedded_response_callback' ),
@@ -573,7 +573,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$url      = add_query_arg( 'parsed_params', 'yes', $url );
 		$response->add_link( 'alternate', $url, array( 'embeddable' => true ) );
 
-		$data = $this->server->response_to_data( $response, true );
+		$data = rest_get_server()->response_to_data( $response, true );
 
 		$this->assertArrayHasKey( '_embedded', $data );
 		$this->assertArrayHasKey( 'alternate', $data['_embedded'] );
@@ -587,7 +587,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 	 */
 	public function test_link_embedding_error() {
 		// Register our testing route.
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test/embeddable', array(
 				'methods'  => 'GET',
 				'callback' => array( $this, 'embedded_response_callback' ),
@@ -599,7 +599,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$url      = add_query_arg( 'error', '1', $url );
 		$response->add_link( 'up', $url, array( 'embeddable' => true ) );
 
-		$data = $this->server->response_to_data( $response, true );
+		$data = rest_get_server()->response_to_data( $response, true );
 
 		$this->assertArrayHasKey( '_embedded', $data );
 		$this->assertArrayHasKey( 'up', $data['_embedded'] );
@@ -621,7 +621,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$data   = array(
 			'untouched' => 'data',
 		);
-		$result = $this->server->embed_links( $data );
+		$result = rest_get_server()->embed_links( $data );
 
 		$this->assertArrayNotHasKey( '_links', $data );
 		$this->assertArrayNotHasKey( '_embedded', $data );
@@ -650,7 +650,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$response->remove_link( 'self' );
 
-		$data = $this->server->response_to_data( $response, false );
+		$data = rest_get_server()->response_to_data( $response, false );
 		$this->assertArrayHasKey( '_links', $data );
 
 		$this->assertArrayNotHasKey( 'self', $data['_links'] );
@@ -669,7 +669,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$response->remove_link( 'self', 'https://example.com/' );
 
-		$data = $this->server->response_to_data( $response, false );
+		$data = rest_get_server()->response_to_data( $response, false );
 		$this->assertArrayHasKey( '_links', $data );
 
 		$this->assertArrayHasKey( 'self', $data['_links'] );
@@ -789,8 +789,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 	public function test_x_robot_tag_header_on_requests() {
 		$request = new WP_REST_Request( 'GET', '/', array() );
 
-		$result  = $this->server->serve_request( '/' );
-		$headers = $this->server->sent_headers;
+		$result  = rest_get_server()->serve_request( '/' );
+		$headers = rest_get_server()->sent_headers;
 
 		$this->assertEquals( 'noindex', $headers['X-Robots-Tag'] );
 	}
@@ -801,10 +801,10 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 	 */
 	public function test_rest_enable_filter_is_deprecated() {
 		add_filter( 'rest_enabled', '__return_false' );
-		$this->server->serve_request( '/' );
+		rest_get_server()->serve_request( '/' );
 		remove_filter( 'rest_enabled', '__return_false' );
 
-		$result = json_decode( $this->server->sent_body );
+		$result = json_decode( rest_get_server()->sent_body );
 
 		$this->assertObjectNotHasAttribute( 'code', $result );
 	}
@@ -814,8 +814,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 		$request = new WP_REST_Request( 'GET', '/', array() );
 
-		$result  = $this->server->serve_request( '/' );
-		$headers = $this->server->sent_headers;
+		$result  = rest_get_server()->serve_request( '/' );
+		$headers = rest_get_server()->sent_headers;
 
 		$this->assertEquals( '<' . esc_url_raw( $api_root ) . '>; rel="https://api.w.org/"', $headers['Link'] );
 	}
@@ -825,8 +825,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$request = new WP_REST_Request( 'GET', '/', array() );
 		wp_set_current_user( $editor );
 
-		$result  = $this->server->serve_request( '/' );
-		$headers = $this->server->sent_headers;
+		$result  = rest_get_server()->serve_request( '/' );
+		$headers = rest_get_server()->sent_headers;
 
 		foreach ( wp_get_nocache_headers() as $header => $value ) {
 			if ( empty( $value ) ) {
@@ -845,8 +845,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		$editor  = self::factory()->user->create( array( 'role' => 'editor' ) );
 		$request = new WP_REST_Request( 'GET', '/', array() );
 
-		$result  = $this->server->serve_request( '/' );
-		$headers = $this->server->sent_headers;
+		$result  = rest_get_server()->serve_request( '/' );
+		$headers = rest_get_server()->sent_headers;
 
 		foreach ( wp_get_nocache_headers() as $header => $value ) {
 			$this->assertFalse( isset( $headers[ $header ] ) && $headers[ $header ] === $value, sprintf( 'Header %s is set to nocache.', $header ) );
@@ -855,7 +855,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 
 	public function test_serve_request_url_params_are_unslashed() {
 
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test/(?P<data>.*)', array(
 				array(
 					'methods'  => WP_REST_Server::READABLE,
@@ -867,14 +867,14 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			)
 		);
 
-		$result     = $this->server->serve_request( '/test/data\\with\\slashes' );
-		$url_params = $this->server->last_request->get_url_params();
+		$result     = rest_get_server()->serve_request( '/test/data\\with\\slashes' );
+		$url_params = rest_get_server()->last_request->get_url_params();
 		$this->assertEquals( 'data\\with\\slashes', $url_params['data'] );
 	}
 
 	public function test_serve_request_query_params_are_unslashed() {
 
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test', array(
 				array(
 					'methods'  => WP_REST_Server::READABLE,
@@ -893,14 +893,14 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			)
 		);
 
-		$result       = $this->server->serve_request( '/test' );
-		$query_params = $this->server->last_request->get_query_params();
+		$result       = rest_get_server()->serve_request( '/test' );
+		$query_params = rest_get_server()->last_request->get_query_params();
 		$this->assertEquals( 'data\\with\\slashes', $query_params['data'] );
 	}
 
 	public function test_serve_request_body_params_are_unslashed() {
 
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test', array(
 				array(
 					'methods'  => WP_REST_Server::READABLE,
@@ -919,15 +919,15 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			)
 		);
 
-		$result = $this->server->serve_request( '/test/data' );
+		$result = rest_get_server()->serve_request( '/test/data' );
 
-		$body_params = $this->server->last_request->get_body_params();
+		$body_params = rest_get_server()->last_request->get_body_params();
 		$this->assertEquals( 'data\\with\\slashes', $body_params['data'] );
 	}
 
 	public function test_serve_request_json_params_are_unslashed() {
 
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test', array(
 				array(
 					'methods'  => WP_REST_Server::READABLE,
@@ -946,14 +946,14 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			)
 		);
 
-		$result      = $this->server->serve_request( '/test' );
-		$json_params = $this->server->last_request->get_json_params();
+		$result      = rest_get_server()->serve_request( '/test' );
+		$json_params = rest_get_server()->last_request->get_json_params();
 		$this->assertEquals( 'data\\with\\slashes', $json_params['data'] );
 	}
 
 	public function test_serve_request_file_params_are_unslashed() {
 
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test', array(
 				array(
 					'methods'  => WP_REST_Server::READABLE,
@@ -972,14 +972,14 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 			),
 		);
 
-		$result      = $this->server->serve_request( '/test/data\\with\\slashes' );
-		$file_params = $this->server->last_request->get_file_params();
+		$result      = rest_get_server()->serve_request( '/test/data\\with\\slashes' );
+		$file_params = rest_get_server()->last_request->get_file_params();
 		$this->assertEquals( 'data\\with\\slashes', $file_params['data']['name'] );
 	}
 
 	public function test_serve_request_headers_are_unslashed() {
 
-		$this->server->register_route(
+		rest_get_server()->register_route(
 			'test', '/test', array(
 				array(
 					'methods'  => WP_REST_Server::READABLE,
@@ -994,8 +994,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 		// WordPress internally will slash the superglobals on bootstrap
 		$_SERVER['HTTP_X_MY_HEADER'] = wp_slash( 'data\\with\\slashes' );
 
-		$result = $this->server->serve_request( '/test/data\\with\\slashes' );
-		$this->assertEquals( 'data\\with\\slashes', $this->server->last_request->get_header( 'x_my_header' ) );
+		$result = rest_get_server()->serve_request( '/test/data\\with\\slashes' );
+		$this->assertEquals( 'data\\with\\slashes', rest_get_server()->last_request->get_header( 'x_my_header' ) );
 	}
 
 	public function filter_wp_rest_server_class() {
@@ -1078,7 +1078,7 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 				'somestring'  => 'foo',
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 	}
@@ -1137,8 +1137,8 @@ class Tests_REST_Server extends WP_Test_REST_TestCase {
 	 */
 	protected function helper_make_request_and_return_headers_for_rest_send_refreshed_nonce_tests() {
 		$request = new WP_REST_Request( 'GET', '/', array() );
-		$result  = $this->server->serve_request( '/' );
+		$result  = rest_get_server()->serve_request( '/' );
 
-		return $this->server->sent_headers;
+		return rest_get_server()->sent_headers;
 	}
 }
diff --git a/tests/phpunit/tests/rest-api/rest-settings-controller.php b/tests/phpunit/tests/rest-api/rest-settings-controller.php
index 97670a21c0..2d9544ce3b 100644
--- a/tests/phpunit/tests/rest-api/rest-settings-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-settings-controller.php
@@ -39,7 +39,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/settings', $routes );
 	}
 
@@ -47,7 +47,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		/** Individual settings can't be gotten */
 		wp_set_current_user( self::$administrator );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings/title' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
@@ -56,21 +56,21 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 
 	public function test_get_item_is_not_public_not_authenticated() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 401, $response->get_status() );
 	}
 
 	public function test_get_item_is_not_public_no_permission() {
 		wp_set_current_user( self::$author );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 403, $response->get_status() );
 	}
 
 	public function test_get_items() {
 		wp_set_current_user( self::$administrator );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$actual   = array_keys( $data );
 
@@ -107,7 +107,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		update_option( 'posts_per_page', 'invalid_number' ); // this is cast to (int) 1
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -131,7 +131,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -141,7 +141,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		update_option( 'mycustomsetting', 'validvalue2' );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'validvalue2', $data['mycustomsettinginrest'] );
 
@@ -168,28 +168,28 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		// Array is cast to correct types.
 		update_option( 'mycustomsetting', array( '1', '2' ) );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array( 1, 2 ), $data['mycustomsetting'] );
 
 		// Empty array works as expected.
 		update_option( 'mycustomsetting', array() );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array(), $data['mycustomsetting'] );
 
 		// Invalid value
 		update_option( 'mycustomsetting', array( array( 1 ) ) );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( null, $data['mycustomsetting'] );
 
 		// No option value
 		delete_option( 'mycustomsetting' );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( null, $data['mycustomsetting'] );
 
@@ -216,20 +216,20 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		// We have to re-register the route, as the args changes based off registered settings.
-		$this->server->override_by_default = true;
+		rest_get_server()->override_by_default = true;
 		$this->endpoint->register_routes();
 
 		// Object is cast to correct types.
 		update_option( 'mycustomsetting', array( 'a' => '1' ) );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array( 'a' => 1 ), $data['mycustomsetting'] );
 
 		// Empty array works as expected.
 		update_option( 'mycustomsetting', array() );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array(), $data['mycustomsetting'] );
 
@@ -241,7 +241,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( null, $data['mycustomsetting'] );
 
@@ -283,7 +283,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		update_option( 'mycustomsetting2', 'unfiltered2' );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -317,7 +317,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		update_option( 'mycustomsetting', array( 'A sneaky array!' ) );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( null, $data['mycustomsettinginrest'] );
 	}
@@ -341,7 +341,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		update_option( 'mycustomsetting', (object) array( 'A sneaky array!' ) );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/settings' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( null, $data['mycustomsettinginrest'] );
 		unregister_setting( 'somegroup', 'mycustomsetting' );
@@ -355,7 +355,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'title', 'The new title!' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -388,13 +388,13 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		// We have to re-register the route, as the args changes based off registered settings.
-		$this->server->override_by_default = true;
+		rest_get_server()->override_by_default = true;
 		$this->endpoint->register_routes();
 		wp_set_current_user( self::$administrator );
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'mycustomsetting', array( '1', '2' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array( 1, 2 ), $data['mycustomsetting'] );
 		$this->assertEquals( array( 1, 2 ), get_option( 'mycustomsetting' ) );
@@ -402,7 +402,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		// Setting an empty array.
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'mycustomsetting', array() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array(), $data['mycustomsetting'] );
 		$this->assertEquals( array(), get_option( 'mycustomsetting' ) );
@@ -410,7 +410,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		// Setting an invalid array.
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'mycustomsetting', array( 'invalid' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		unregister_setting( 'somegroup', 'mycustomsetting' );
@@ -439,7 +439,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		// We have to re-register the route, as the args changes based off registered settings.
-		$this->server->override_by_default = true;
+		rest_get_server()->override_by_default = true;
 		$this->endpoint->register_routes();
 		wp_set_current_user( self::$administrator );
 
@@ -452,7 +452,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 				),
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -474,13 +474,13 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		);
 
 		// We have to re-register the route, as the args changes based off registered settings.
-		$this->server->override_by_default = true;
+		rest_get_server()->override_by_default = true;
 		$this->endpoint->register_routes();
 		wp_set_current_user( self::$administrator );
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'mycustomsetting', array( 'a' => 1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array( 'a' => 1 ), $data['mycustomsetting'] );
 		$this->assertEquals( array( 'a' => 1 ), get_option( 'mycustomsetting' ) );
@@ -488,7 +488,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		// Setting an empty object.
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'mycustomsetting', array() );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( array(), $data['mycustomsetting'] );
 		$this->assertEquals( array(), get_option( 'mycustomsetting' ) );
@@ -501,14 +501,14 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 				'b' => 2,
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
 		// Setting an invalid object.
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'mycustomsetting', array( 'a' => 'invalid' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		unregister_setting( 'somegroup', 'mycustomsetting' );
 	}
@@ -519,7 +519,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'title', 'The old title!' );
 		$request->set_param( 'description', 'The old description!' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 'The old title!', $data['title'] );
@@ -532,7 +532,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'title', 'The new title!' );
 		$request->set_param( 'description', 'The new description!' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -548,7 +548,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'title', array( 'rendered' => 'This should fail.' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -556,7 +556,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'posts_per_page', 11 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -564,7 +564,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'posts_per_page', 10.5 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -577,7 +577,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'posts_per_page', null );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -590,7 +590,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'default_ping_status', 'open&closed' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -608,7 +608,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/settings' );
 		$request->set_param( 'mycustomsetting', null );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_stored_value', $response, 500 );
 	}
@@ -616,7 +616,7 @@ class WP_Test_REST_Settings_Controller extends WP_Test_REST_Controller_Testcase
 	public function test_delete_item() {
 		/** Settings can't be deleted */
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/settings/title' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
diff --git a/tests/phpunit/tests/rest-api/rest-tags-controller.php b/tests/phpunit/tests/rest-api/rest-tags-controller.php
index 04fe95d9a2..e56e92268d 100644
--- a/tests/phpunit/tests/rest-api/rest-tags-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-tags-controller.php
@@ -50,7 +50,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 		$this->assertArrayHasKey( '/wp/v2/tags', $routes );
 		$this->assertArrayHasKey( '/wp/v2/tags/(?P<id>[\d]+)', $routes );
 	}
@@ -58,14 +58,14 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/tags' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$tag1     = $this->factory->tag->create( array( 'name' => 'Season 5' ) );
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/tags/' . $tag1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -73,7 +73,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_registered_query_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/tags' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -98,7 +98,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_get_items() {
 		$this->factory->tag->create();
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_taxonomy_terms_response( $response );
 	}
 
@@ -106,7 +106,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
@@ -117,14 +117,14 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_object_terms( $post_id, array( $tag1, $tag2 ), 'post_tag' );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'hide_empty', true );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( 'Season 5', $data[0]['name'] );
 		$this->assertEquals( 'The Be Sharps', $data[1]['name'] );
 		// invalid value should fail
 		$request->set_param( 'hide_empty', 'nothanks' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -135,19 +135,19 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		// Orderby=>asc
 		$request->set_param( 'include', array( $id3, $id1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id1, $data[0]['id'] );
 		// Orderby=>include
 		$request->set_param( 'orderby', 'include' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id3, $data[0]['id'] );
 		// Include invalid value shoud fail
 		$request->set_param( 'include', array( 'myterm' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -155,18 +155,18 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$id1      = $this->factory->tag->create();
 		$id2      = $this->factory->tag->create();
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertTrue( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 		$request->set_param( 'exclude', array( $id2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertFalse( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 		// Invalid exclude value should fail
 		$request->set_param( 'exclude', array( 'invalid' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -177,19 +177,19 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$id4     = $this->factory->tag->create();
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'offset', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 3, $response->get_data() );
 		// 'offset' works with 'per_page'
 		$request->set_param( 'per_page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// 'offset' takes priority over 'page'
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// 'offset' invalid value shoudl fail
 		$request->set_param( 'offset', 'moreplease' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -207,7 +207,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'orderby', 'name' );
 		$request->set_param( 'order', 'desc' );
 		$request->set_param( 'per_page', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
@@ -216,14 +216,14 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'orderby', 'name' );
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'per_page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( 'Apple', $data[0]['name'] );
 		// Invalid orderby should fail.
 		$request->set_param( 'orderby', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -233,7 +233,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$tag2 = $this->factory->tag->create( array( 'name' => 'Banana' ) );
 		// defaults to orderby=name, order=asc
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'Apple', $data[0]['name'] );
@@ -242,7 +242,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		// orderby=id, with default order=asc
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'orderby', 'id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'Cantaloupe', $data[0]['name'] );
@@ -252,7 +252,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'orderby', 'id' );
 		$request->set_param( 'order', 'desc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 'Banana', $data[0]['name'] );
@@ -268,7 +268,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'orderby', 'include_slugs' );
 		$request->set_param( 'slug', array( 'taco', 'burrito', 'chalupa' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 200, $response->get_status() );
 		$this->assertEquals( 'taco', $data[0]['slug'] );
@@ -285,7 +285,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -295,7 +295,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		// Invalid post should error.
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'post', 'invalid-post' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -317,7 +317,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'page', 1 );
 		$request->set_param( 'per_page', 15 );
 		$request->set_param( 'orderby', 'id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$tags     = $response->get_data();
 
 		$i = 0;
@@ -331,7 +331,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'page', 2 );
 		$request->set_param( 'per_page', 15 );
 		$request->set_param( 'orderby', 'id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$tags     = $response->get_data();
 
 		foreach ( $tags as $tag ) {
@@ -345,7 +345,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -379,7 +379,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/batman' );
 		$request->set_param( 'post', $post_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$data = $response->get_data();
@@ -396,14 +396,14 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		 */
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'search', 'App' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( 'Apple', $data[0]['name'] );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'search', 'Garbage' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 0, count( $data ) );
@@ -414,7 +414,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$tag2    = $this->factory->tag->create( array( 'name' => 'Banana' ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'slug', 'apple' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
@@ -434,7 +434,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 				'enchilada',
 			)
 		);
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data  = $response->get_data();
 		$names = wp_list_pluck( $data, 'name' );
@@ -449,7 +449,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$this->factory->tag->create( array( 'name' => 'Pizza' ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'slug', 'taco,burrito, enchilada' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data  = $response->get_data();
 		$names = wp_list_pluck( $data, 'name' );
@@ -473,7 +473,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/terms/robin' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
@@ -487,7 +487,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 			);
 		}
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 50, $headers['X-WP-Total'] );
 		$this->assertEquals( 5, $headers['X-WP-TotalPages'] );
@@ -506,7 +506,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -525,7 +525,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		// Last page
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'page', 6 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -539,7 +539,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		// Out of bounds
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'page', 8 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 51, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -555,20 +555,20 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_get_items_invalid_context() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'context', 'banana' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
 	public function test_get_item() {
 		$id       = $this->factory->tag->create();
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags/' . $id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_taxonomy_term_response( $response, $id );
 	}
 
 	public function test_get_term_invalid_term() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -577,7 +577,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags/' . $id );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
@@ -591,7 +591,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/terms/robin/' . $term1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_no_route', $response, 404 );
 	}
 
@@ -604,7 +604,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 			)
 		);
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags/' . $term1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -614,7 +614,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'name', 'My Awesome Term' );
 		$request->set_param( 'description', 'This term is so awesome.' );
 		$request->set_param( 'slug', 'so-awesome' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$headers = $response->get_headers();
 		$data    = $response->get_data();
@@ -628,14 +628,14 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$subscriber );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/tags' );
 		$request->set_param( 'name', 'Incorrect permissions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_create', $response, 403 );
 	}
 
 	public function test_create_item_missing_arguments() {
 		wp_set_current_user( self::$administrator );
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/tags' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_missing_callback_param', $response, 400 );
 	}
 
@@ -645,7 +645,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/tags' );
 		$request->set_param( 'name', 'My Awesome Term' );
 		$request->set_param( 'parent', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_taxonomy_not_hierarchical', $response, 400 );
 	}
 
@@ -661,7 +661,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'name', 'New Name' );
 		$request->set_param( 'description', 'New Description' );
 		$request->set_param( 'slug', 'new-slug' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( 'New Name', $data['name'] );
@@ -675,16 +675,16 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/tags/' . $term->term_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$request->set_param( 'slug', $term->slug );
 
 		// Run twice to make sure that the update still succeeds even if no DB
 		// rows are updated.
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -692,7 +692,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$administrator );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/tags/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
 		$request->set_param( 'name', 'Invalid Term' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -701,7 +701,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$term    = get_term_by( 'id', $this->factory->tag->create(), 'post_tag' );
 		$request = new WP_REST_Request( 'POST', '/wp/v2/tags/' . $term->term_id );
 		$request->set_param( 'name', 'Incorrect permissions' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_update', $response, 403 );
 	}
 
@@ -715,7 +715,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'name', 'New Name' );
 
 		add_filter( 'map_meta_cap', array( $this, 'grant_edit_term' ), 10, 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'user_has_cap', array( $this, 'grant_edit_term' ), 10, 2 );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -740,7 +740,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'name', 'New Name' );
 
 		add_filter( 'map_meta_cap', array( $this, 'revoke_edit_term' ), 10, 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'user_has_cap', array( $this, 'revoke_edit_term' ), 10, 2 );
 
 		$this->assertErrorResponse( 'rest_cannot_update', $response, 403 );
@@ -759,7 +759,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/tags/' . $term->term_id );
 		$request->set_param( 'parent', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_taxonomy_not_hierarchical', $response, 400 );
 	}
 
@@ -769,7 +769,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		foreach ( $input as $name => $value ) {
 			$request->set_param( $name, $value );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 201, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -787,7 +787,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		foreach ( $input as $name => $value ) {
 			$request->set_param( $name, $value );
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -875,7 +875,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$term    = get_term_by( 'id', $this->factory->tag->create( array( 'name' => 'Deleted Tag' ) ), 'post_tag' );
 		$request = new WP_REST_Request( 'DELETE', '/wp/v2/tags/' . $term->term_id );
 		$request->set_param( 'force', true );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertTrue( $data['deleted'] );
@@ -887,18 +887,18 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$term = get_term_by( 'id', $this->factory->tag->create( array( 'name' => 'Deleted Tag' ) ), 'post_tag' );
 
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/tags/' . $term->term_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 	}
 
 	public function test_delete_item_invalid_term() {
 		wp_set_current_user( self::$administrator );
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/tags/' . REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_term_invalid', $response, 404 );
 	}
 
@@ -906,7 +906,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$subscriber );
 		$term     = get_term_by( 'id', $this->factory->tag->create(), 'post_tag' );
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/tags/' . $term->term_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_delete', $response, 403 );
 	}
 
@@ -920,7 +920,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'force', true );
 
 		add_filter( 'map_meta_cap', array( $this, 'grant_delete_term' ), 10, 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'map_meta_cap', array( $this, 'grant_delete_term' ), 10, 2 );
 
 		$this->assertEquals( 200, $response->get_status() );
@@ -946,7 +946,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'force', true );
 
 		add_filter( 'map_meta_cap', array( $this, 'revoke_delete_term' ), 10, 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		remove_filter( 'map_meta_cap', array( $this, 'revoke_delete_term' ), 10, 2 );
 
 		$this->assertErrorResponse( 'rest_cannot_delete', $response, 403 );
@@ -962,7 +962,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_prepare_item() {
 		$term     = get_term_by( 'id', $this->factory->tag->create(), 'post_tag' );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/tags/' . $term->term_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->check_taxonomy_term( $term, $data, $response->get_links() );
@@ -970,7 +970,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/tags' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 8, count( $properties ) );
@@ -987,7 +987,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_get_item_schema_non_hierarchical() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/tags' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertArrayHasKey( 'id', $properties );
@@ -1012,7 +1012,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/tags' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
 		$this->assertEquals( $schema, $data['schema']['properties']['my_custom_int'] );
@@ -1020,7 +1020,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 		$tag_id  = $this->factory->tag->create();
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags/' . $tag_id );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		global $wp_rest_additional_fields;
@@ -1053,7 +1053,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
@@ -1073,7 +1073,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'post', $p );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$found_1  = wp_list_pluck( $response->data, 'id' );
 
 		unset( $request, $response );
@@ -1082,7 +1082,7 @@ class WP_Test_REST_Tags_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/tags' );
 		$request->set_param( 'post', $p );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$found_2  = wp_list_pluck( $response->data, 'id' );
 
 		$this->assertEqualSets( $found_1, $found_2 );
diff --git a/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php b/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php
index 5a736086aa..bd87effebe 100644
--- a/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-taxonomies-controller.php
@@ -26,7 +26,7 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 
 		$this->assertArrayHasKey( '/wp/v2/taxonomies', $routes );
 		$this->assertArrayHasKey( '/wp/v2/taxonomies/(?P<taxonomy>[\w-]+)', $routes );
@@ -35,13 +35,13 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/taxonomies' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'edit', 'embed' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/taxonomies/post_tag' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEqualSets( array( 'view', 'edit', 'embed' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -49,7 +49,7 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_items() {
 		$request    = new WP_REST_Request( 'GET', '/wp/v2/taxonomies' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$taxonomies = $this->get_public_taxonomies( get_taxonomies( '', 'objects' ) );
 		$this->assertEquals( count( $taxonomies ), count( $data ) );
@@ -66,21 +66,21 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/taxonomies' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_view', $response, 401 );
 	}
 
 	public function test_get_taxonomies_for_type() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/taxonomies' );
 		$request->set_param( 'type', 'post' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_taxonomies_for_type_response( 'post', $response );
 	}
 
 	public function test_get_taxonomies_for_invalid_type() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/taxonomies' );
 		$request->set_param( 'type', 'wingding' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data = $response->get_data();
 		$this->assertEquals( '{}', json_encode( $data ) );
@@ -88,7 +88,7 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_item() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/taxonomies/category' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_taxonomy_object_response( 'view', $response );
 	}
 
@@ -97,7 +97,7 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( $editor_id );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/taxonomies/category' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_taxonomy_object_response( 'edit', $response );
 	}
 
@@ -105,13 +105,13 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/taxonomies/category' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_context', $response, 401 );
 	}
 
 	public function test_get_invalid_taxonomy() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/taxonomies/invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_taxonomy_invalid', $response, 404 );
 	}
 
@@ -119,7 +119,7 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 		register_taxonomy( 'api-private', 'post', array( 'public' => false ) );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/taxonomies/api-private' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden', $response, 401 );
 	}
 
@@ -128,28 +128,28 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 		register_taxonomy( 'api-private', 'post', array( 'public' => false ) );
 
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/taxonomies/api-private' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden', $response, 403 );
 	}
 
 	public function test_create_item() {
 		/** Taxonomies can't be created */
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/taxonomies' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
 	public function test_update_item() {
 		/** Taxonomies can't be updated */
 		$request  = new WP_REST_Request( 'POST', '/wp/v2/taxonomies/category' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
 	public function test_delete_item() {
 		/** Taxonomies can't be deleted */
 		$request  = new WP_REST_Request( 'DELETE', '/wp/v2/taxonomies/category' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 404, $response->get_status() );
 	}
 
@@ -164,7 +164,7 @@ class WP_Test_REST_Taxonomies_Controller extends WP_Test_REST_Controller_Testcas
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/taxonomies' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 		$this->assertEquals( 9, count( $properties ) );
diff --git a/tests/phpunit/tests/rest-api/rest-users-controller.php b/tests/phpunit/tests/rest-api/rest-users-controller.php
index 7b81eb1240..8c43f36089 100644
--- a/tests/phpunit/tests/rest-api/rest-users-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-users-controller.php
@@ -123,7 +123,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 	}
 
 	public function test_register_routes() {
-		$routes = $this->server->get_routes();
+		$routes = rest_get_server()->get_routes();
 
 		$this->assertArrayHasKey( '/wp/v2/users', $routes );
 		$this->assertCount( 2, $routes['/wp/v2/users'] );
@@ -135,13 +135,13 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_context_param() {
 		// Collection
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/users' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
 		// Single
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/users/' . self::$user );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'view', $data['endpoints'][0]['args']['context']['default'] );
 		$this->assertEquals( array( 'view', 'embed', 'edit' ), $data['endpoints'][0]['args']['context']['enum'] );
@@ -149,7 +149,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_registered_query_params() {
 		$request  = new WP_REST_Request( 'OPTIONS', '/wp/v2/users' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$keys     = array_keys( $data['endpoints'][0]['args'] );
 		sort( $keys );
@@ -175,7 +175,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'context', 'view' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -190,7 +190,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 200, $response->get_status() );
 
@@ -204,7 +204,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		//test with a user not logged in
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 401, $response->get_status() );
 
@@ -212,14 +212,14 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$editor );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 403, $response->get_status() );
 	}
 
 	public function test_get_items_unauthenticated_includes_authors_of_post_types_shown_in_rest() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/users' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$users    = $response->get_data();
 
 		$rest_post_types = array_values( get_post_types( array( 'show_in_rest' => true ), 'names' ) );
@@ -250,7 +250,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_get_items_unauthenticated_does_not_include_authors_of_post_types_not_shown_in_rest() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/users' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$users    = $response->get_data();
 		$user_ids = wp_list_pluck( $users, 'id' );
 
@@ -260,7 +260,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_get_items_unauthenticated_does_not_include_users_without_published_posts() {
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/users' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$users    = $response->get_data();
 		$user_ids = wp_list_pluck( $users, 'id' );
 
@@ -278,7 +278,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 			);
 		}
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/users' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 53, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -297,7 +297,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 54, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -316,7 +316,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		// Last page
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'page', 6 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 54, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -330,7 +330,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		// Out of bounds
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'page', 8 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$headers  = $response->get_headers();
 		$this->assertEquals( 54, $headers['X-WP-Total'] );
 		$this->assertEquals( 6, $headers['X-WP-TotalPages'] );
@@ -349,11 +349,11 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 			$this->factory->user->create( array( 'display_name' => "User {$i}" ) );
 		}
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/users' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 10, count( $response->get_data() ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'per_page', 5 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 5, count( $response->get_data() ) );
 	}
 
@@ -365,7 +365,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'per_page', 5 );
 		$request->set_param( 'page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 5, count( $response->get_data() ) );
 		$prev_link = add_query_arg(
 			array(
@@ -386,14 +386,14 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'orderby', 'name' );
 		$request->set_param( 'order', 'desc' );
 		$request->set_param( 'per_page', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $high_id, $data[0]['id'] );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'orderby', 'name' );
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'per_page', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $low_id, $data[0]['id'] );
 	}
@@ -409,7 +409,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'order', 'desc' );
 		$request->set_param( 'per_page', 1 );
 		$request->set_param( 'include', array( $low_id, $high_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( $high_id, $data[0]['id'] );
@@ -419,7 +419,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'per_page', 1 );
 		$request->set_param( 'include', array( $low_id, $high_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $low_id, $data[0]['id'] );
 	}
@@ -435,7 +435,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'order', 'desc' );
 		$request->set_param( 'per_page', 1 );
 		$request->set_param( 'include', array( $low_id, $high_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( $high_id, $data[0]['id'] );
@@ -445,7 +445,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'per_page', 1 );
 		$request->set_param( 'include', array( $low_id, $high_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $low_id, $data[0]['id'] );
 	}
@@ -460,7 +460,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'orderby', 'include_slugs' );
 		$request->set_param( 'slug', array( 'taco', 'burrito', 'chalupa' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertEquals( 'taco', $data[0]['slug'] );
@@ -479,7 +479,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'order', 'desc' );
 		$request->set_param( 'per_page', 1 );
 		$request->set_param( 'include', array( $low_id, $high_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $high_id, $data[0]['id'] );
 
@@ -488,7 +488,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'order', 'asc' );
 		$request->set_param( 'per_page', 1 );
 		$request->set_param( 'include', array( $low_id, $high_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( $low_id, $data[0]['id'] );
 	}
@@ -497,7 +497,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'orderby', 'email' );
 		$request->set_param( 'order', 'desc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_orderby', $response, 401 );
 	}
 
@@ -505,21 +505,21 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'orderby', 'registered_date' );
 		$request->set_param( 'order', 'desc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_forbidden_orderby', $response, 401 );
 	}
 
 	public function test_get_items_invalid_order() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'order', 'asc,id' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
 	public function test_get_items_invalid_orderby() {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'orderby', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -529,19 +529,19 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$this->factory->user->create();
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'offset', 1 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 9, $response->get_data() );
 		// 'offset' works with 'per_page'
 		$request->set_param( 'per_page', 2 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// 'offset' takes priority over 'page'
 		$request->set_param( 'page', 3 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertCount( 2, $response->get_data() );
 		// 'offset' invalid value should error
 		$request->set_param( 'offset', 'moreplease' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -553,24 +553,24 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		// Orderby=>asc
 		$request->set_param( 'include', array( $id3, $id1 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id1, $data[0]['id'] );
 		// Orderby=>include
 		$request->set_param( 'orderby', 'include' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $id3, $data[0]['id'] );
 		// Invalid include should fail
 		$request->set_param( 'include', 'invalid' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 		// No privileges
 		$request->set_param( 'include', array( $id3, $id1 ) );
 		wp_set_current_user( 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 0, count( $data ) );
 
@@ -582,18 +582,18 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$id2     = $this->factory->user->create();
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'per_page', 20 ); // there are >10 users at this point
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertTrue( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 		$request->set_param( 'exclude', array( $id2 ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertTrue( in_array( $id1, wp_list_pluck( $data, 'id' ), true ) );
 		$this->assertFalse( in_array( $id2, wp_list_pluck( $data, 'id' ), true ) );
 		// Invalid exlude value should error.
 		$request->set_param( 'exclude', 'none-of-those-please' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -601,12 +601,12 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$user );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'search', 'yololololo' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 0, count( $response->get_data() ) );
 		$yolo_id = $this->factory->user->create( array( 'display_name' => 'yololololo' ) );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'search', 'yololololo' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 1, count( $response->get_data() ) );
 		// default to wildcard search
 		$adam_id = $this->factory->user->create(
@@ -617,7 +617,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'search', 'ada' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $adam_id, $data[0]['id'] );
@@ -639,7 +639,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'slug', 'foo' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $id2, $data[0]['id'] );
@@ -681,7 +681,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		$request->set_param( 'orderby', 'slug' );
 		$request->set_param( 'order', 'asc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data  = $response->get_data();
 		$slugs = wp_list_pluck( $data, 'slug' );
@@ -718,7 +718,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'slug', 'taco,burrito , enchilada' );
 		$request->set_param( 'orderby', 'slug' );
 		$request->set_param( 'order', 'desc' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$data  = $response->get_data();
 		$slugs = wp_list_pluck( $data, 'slug' );
@@ -742,23 +742,23 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'roles', 'author,subscriber' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 2, count( $data ) );
 		$this->assertEquals( $tango, $data[0]['id'] );
 		$this->assertEquals( $yolo, $data[1]['id'] );
 		$request->set_param( 'roles', 'author' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $yolo, $data[0]['id'] );
 		wp_set_current_user( 0 );
 		$request->set_param( 'roles', 'author' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 401 );
 		wp_set_current_user( self::$editor );
 		$request->set_param( 'roles', 'author' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 403 );
 	}
 
@@ -772,13 +772,13 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'roles', 'ilovesteak,author' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 1, count( $data ) );
 		$this->assertEquals( $lolz, $data[0]['id'] );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users' );
 		$request->set_param( 'roles', 'steakisgood' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 0, count( $data ) );
 		$this->assertEquals( array(), $data );
@@ -790,7 +790,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', $user_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_user_response( $response, 'embed' );
 	}
 
@@ -808,7 +808,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$editor ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$data = $response->get_data();
 		$this->assertArrayHasKey( 24, $data['avatar_urls'] );
@@ -826,7 +826,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_get_user_invalid_id() {
 		wp_set_current_user( self::$user );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/users/100' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
@@ -845,7 +845,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		delete_user_option( $lolz, 'user_level' );
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users/' . $lolz );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		if ( is_multisite() ) {
 			$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
@@ -860,57 +860,57 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_cannot_get_item_without_permission() {
 		wp_set_current_user( self::$editor );
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$user ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 403 );
 	}
 
 	public function test_can_get_item_author_of_rest_true_public_true_unauthenticated() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$authors['r_true_p_true'] ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
 	public function test_can_get_item_author_of_rest_true_public_true_authenticated() {
 		wp_set_current_user( self::$editor );
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$authors['r_true_p_true'] ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
 	public function test_can_get_item_author_of_rest_true_public_false() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$authors['r_true_p_false'] ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
 	public function test_cannot_get_item_author_of_rest_false_public_true_unauthenticated() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$authors['r_false_p_true'] ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 401 );
 	}
 
 	public function test_cannot_get_item_author_of_rest_false_public_true_without_permission() {
 		wp_set_current_user( self::$editor );
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$authors['r_false_p_true'] ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 403 );
 	}
 
 	public function test_cannot_get_item_author_of_rest_false_public_false() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$authors['r_false_p_false'] ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 401 );
 	}
 
 	public function test_can_get_item_author_of_post() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$editor ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
 	public function test_cannot_get_item_author_of_draft() {
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', self::$draft_editor ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 401 );
 	}
 
@@ -927,7 +927,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		wp_set_current_user( 0 );
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', $this->author_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_user_response( $response, 'embed' );
 	}
 
@@ -939,7 +939,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		);
 		wp_set_current_user( 0 );
 		$request  = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', $this->author_id ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 401, $response->get_status() );
 		$this->post_id = $this->factory->post->create(
 			array(
@@ -947,7 +947,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 				'post_type'   => 'page',
 			)
 		);
-		$response      = $this->server->dispatch( $request );
+		$response      = rest_get_server()->dispatch( $request );
 		$this->check_get_user_response( $response, 'embed' );
 	}
 
@@ -958,7 +958,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'context', 'edit' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_get_user_response( $response, 'edit' );
 	}
 
@@ -976,7 +976,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( 0 );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', $this->author_id ) );
 		$request->set_param( 'context', 'edit' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_cannot_view', $response, 401 );
 	}
 
@@ -985,7 +985,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users/me' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$this->check_get_user_response( $response, 'view' );
 
@@ -999,7 +999,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_get_current_user_without_permission() {
 		wp_set_current_user( 0 );
 		$request  = new WP_REST_Request( 'GET', '/wp/v2/users/me' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_not_logged_in', $response, 401 );
 	}
@@ -1024,7 +1024,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$this->assertEquals( 'http://example.com', $data['url'] );
 		$this->assertEquals( array( 'editor' ), $data['roles'] );
@@ -1056,7 +1056,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
 		$data = $response->get_data();
@@ -1100,7 +1100,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		remove_filter( 'illegal_user_logins', array( $this, 'get_illegal_user_logins' ) );
 
@@ -1130,7 +1130,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$user_id  = $data['id'];
 
@@ -1161,7 +1161,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'user_cannot_be_added', $response );
 	}
 
@@ -1184,7 +1184,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$user_id  = $data['id'];
 
@@ -1214,7 +1214,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 		$user_id  = $data['id'];
 
@@ -1223,7 +1223,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$switched_response = $this->server->dispatch( $request );
+		$switched_response = rest_get_server()->dispatch( $request );
 
 		restore_current_blog();
 
@@ -1259,7 +1259,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_add_edit_user_response( $response );
 	}
 
@@ -1275,7 +1275,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_create_user', $response, 403 );
 	}
@@ -1294,7 +1294,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_exists', $response, 400 );
 	}
@@ -1312,7 +1312,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -1331,7 +1331,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_role', $response, 400 );
 	}
@@ -1363,7 +1363,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $_POST );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_add_edit_user_response( $response, true );
 
 		// Check that the name has been updated correctly
@@ -1391,10 +1391,10 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		// Run twice to make sure that the update still succeeds even if no DB
 		// rows are updated.
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 	}
 
@@ -1416,7 +1416,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/' . $user2 );
 		$request->set_param( 'email', 'testjson@example.com' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertInstanceOf( 'WP_Error', $response->as_error() );
 		$this->assertEquals( 'rest_user_invalid_email', $response->as_error()->get_error_code() );
 	}
@@ -1433,7 +1433,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/' . $user1 );
 		$request->set_param( 'locale', 'klingon' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertInstanceOf( 'WP_Error', $response->as_error() );
 		$this->assertEquals( 'rest_invalid_param', $response->as_error()->get_error_code() );
 	}
@@ -1450,7 +1450,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/' . $user_id );
 		$request->set_param( 'locale', 'en_US' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_add_edit_user_response( $response, true );
 
 		$user = get_userdata( $user_id );
@@ -1473,7 +1473,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/' . $user_id );
 		$request->set_param( 'locale', '' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_add_edit_user_response( $response, true );
 
 		$data = $response->get_data();
@@ -1500,7 +1500,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/' . $user2 );
 		$request->set_param( 'username', 'test_json_user' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertInstanceOf( 'WP_Error', $response->as_error() );
 		$this->assertEquals( 'rest_user_invalid_argument', $response->as_error()->get_error_code() );
 	}
@@ -1523,7 +1523,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/' . $user2 );
 		$request->set_param( 'slug', 'test_json_user' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertInstanceOf( 'WP_Error', $response->as_error() );
 		$this->assertEquals( 'rest_user_invalid_slug', $response->as_error()->get_error_code() );
 	}
@@ -1555,7 +1555,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/json' );
 		$request->set_body( wp_json_encode( $params ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->check_add_edit_user_response( $response, true );
 
 		// Check that the name has been updated correctly
@@ -1579,7 +1579,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'roles', array( 'editor' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 
@@ -1599,7 +1599,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'roles', 'author,editor' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 
@@ -1616,7 +1616,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', self::$editor ) );
 		$request->set_param( 'roles', array( 'administrator' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_edit_roles', $response, 403 );
 		$user = get_userdata( self::$editor );
@@ -1625,7 +1625,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/me' );
 		$request->set_param( 'roles', array( 'administrator' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_edit_roles', $response, 403 );
 		$user = get_userdata( self::$editor );
@@ -1643,7 +1643,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'roles', array( 'editor' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_role', $response, 403 );
 
@@ -1653,7 +1653,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/me' );
 		$request->set_param( 'roles', array( 'editor' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_role', $response, 403 );
 
@@ -1674,7 +1674,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'roles', array( 'editor' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( 'editor', $new_data['roles'][0] );
@@ -1688,7 +1688,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/me' );
 		$request->set_param( 'roles', array( 'editor' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$new_data = $response->get_data();
 		$this->assertEquals( 'editor', $new_data['roles'][0] );
@@ -1702,7 +1702,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', self::$editor ) );
 		$request->set_param( 'roles', array( 'BeSharp' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_role', $response, 400 );
 
@@ -1712,7 +1712,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/me' );
 		$request->set_param( 'roles', array( 'BeSharp' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_role', $response, 400 );
 
@@ -1733,14 +1733,14 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', self::$user ) );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_cannot_edit', $response, 403 );
 
 		$request = new WP_REST_Request( 'PUT', '/wp/v2/users/me' );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_argument', $response, 400 );
 	}
@@ -1759,7 +1759,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', self::$editor ) );
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( $params );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
@@ -1777,7 +1777,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$editor );
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'roles', array( 'editor' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_cannot_edit_roles', $response, 403 );
 	}
 
@@ -1794,7 +1794,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$user );
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'roles', array( 'editor' ) );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 
 		$new_data = $response->get_data();
@@ -1815,7 +1815,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'roles', array( 'editor' ) );
 		$request->set_param( 'name', 'Short-Lived User' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		if ( is_multisite() ) {
 			// Site administrators can promote users, as verified by the
@@ -1839,11 +1839,11 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request = new WP_REST_Request( 'PUT', sprintf( '/wp/v2/users/%d', self::$editor ) );
 
 		$request->set_param( 'password', 'no\\backslashes\\allowed' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
 		$request->set_param( 'password', '' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
 
@@ -1858,7 +1858,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 				$request->set_param( $name, $value );
 			}
 			$request->set_param( 'email', 'cbg@androidsdungeon.com' );
-			$response = $this->server->dispatch( $request );
+			$response = rest_get_server()->dispatch( $request );
 			$this->assertEquals( 201, $response->get_status() );
 			$actual_output = $response->get_data();
 
@@ -1892,7 +1892,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 				$request->set_param( $name, $value );
 			}
 		}
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 200, $response->get_status() );
 		$actual_output = $response->get_data();
 
@@ -2059,7 +2059,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request  = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'force', true );
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2083,7 +2083,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2094,7 +2094,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		// Ensure the user still exists
@@ -2117,7 +2117,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', '/wp/v2/users/me' );
 		$request['force'] = true;
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2145,7 +2145,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'DELETE', '/wp/v2/users/me' );
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2156,7 +2156,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		$request->set_param( 'force', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_trash_not_supported', $response, 501 );
 
 		// Ensure the user still exists
@@ -2173,14 +2173,14 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_cannot_delete', $response, 403 );
 
 		$request          = new WP_REST_Request( 'DELETE', '/wp/v2/users/me' );
 		$request['force'] = true;
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_cannot_delete', $response, 403 );
 	}
@@ -2192,7 +2192,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', '/wp/v2/users/100' );
 		$request['force'] = true;
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
@@ -2218,7 +2218,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', $reassign_id );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2242,7 +2242,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', 100 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2262,7 +2262,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', 'null' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 	}
@@ -2282,7 +2282,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', false );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2309,7 +2309,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', 'false' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2336,7 +2336,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', '' );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2363,7 +2363,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request          = new WP_REST_Request( 'DELETE', sprintf( '/wp/v2/users/%d', $user_id ) );
 		$request['force'] = true;
 		$request->set_param( 'reassign', 0 );
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		// Not implemented in multisite.
 		if ( is_multisite() ) {
@@ -2377,7 +2377,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 	public function test_get_item_schema() {
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/users' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 
@@ -2407,7 +2407,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 	public function test_get_item_schema_show_avatar() {
 		update_option( 'show_avatars', false );
 		$request    = new WP_REST_Request( 'OPTIONS', '/wp/v2/users' );
-		$response   = $this->server->dispatch( $request );
+		$response   = rest_get_server()->dispatch( $request );
 		$data       = $response->get_data();
 		$properties = $data['schema']['properties'];
 
@@ -2433,7 +2433,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'OPTIONS', '/wp/v2/users' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$data     = $response->get_data();
 
 		$this->assertArrayHasKey( 'my_custom_int', $data['schema']['properties'] );
@@ -2447,7 +2447,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 
 		$request = new WP_REST_Request( 'GET', '/wp/v2/users/1' );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertArrayHasKey( 'my_custom_int', $response->data );
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users/1' );
@@ -2457,7 +2457,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertEquals( 123, get_user_meta( 1, 'my_custom_int', true ) );
 
 		$request = new WP_REST_Request( 'POST', '/wp/v2/users' );
@@ -2470,7 +2470,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertEquals( 123, $response->data['my_custom_int'] );
 
@@ -2508,7 +2508,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 			)
 		);
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 
 		$this->assertErrorResponse( 'rest_invalid_param', $response, 400 );
 
@@ -2532,7 +2532,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$user );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', $user_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
 
@@ -2552,7 +2552,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		wp_set_current_user( self::$superadmin );
 		$request = new WP_REST_Request( 'GET', sprintf( '/wp/v2/users/%d', $user_id ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
 
@@ -2574,7 +2574,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( array( 'first_name' => 'New Name' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
 
@@ -2596,7 +2596,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->add_header( 'content-type', 'application/x-www-form-urlencoded' );
 		$request->set_body_params( array( 'first_name' => 'New Name' ) );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
 
@@ -2618,7 +2618,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'force', true );
 		$request->set_param( 'reassign', false );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}
 
@@ -2640,7 +2640,7 @@ class WP_Test_REST_Users_Controller extends WP_Test_REST_Controller_Testcase {
 		$request->set_param( 'force', true );
 		$request->set_param( 'reassign', false );
 
-		$response = $this->server->dispatch( $request );
+		$response = rest_get_server()->dispatch( $request );
 		$this->assertErrorResponse( 'rest_user_invalid_id', $response, 404 );
 	}