Index: tests/phpunit/tests/multisite/network-admin/sites.php
===================================================================
--- tests/phpunit/tests/multisite/network-admin/sites.php	(revision 0)
+++ tests/phpunit/tests/multisite/network-admin/sites.php	(working copy)
@@ -0,0 +1,71 @@
+<?php
+
+if ( is_multisite() ) :
+
+/**
+ * Tests specific to Network Admin -> Sites in multisite.
+ *
+ * @group ms-site
+ * @group multisite
+ */
+class Tests_Multisite_Network_Admin_Sites extends WP_UnitTestCase {
+
+	function setUp() {
+		set_current_screen( 'sites-network' );
+		$GLOBALS['hook_suffix'] = '';
+		$this->table = _get_list_table( 'WP_MS_Sites_List_Table' );
+
+		parent::setUp();
+	}
+
+	/**
+	 * @ticket 33185
+	 * @dataProvider data_site_searches
+	 */
+	public function test_site_searches_match_expected_results( $search, $matches ) {
+
+		$blogs = array();
+		$paths = array(
+			'abc123',
+			'three',
+		);
+
+		$this->assertSame( 1, count( wp_get_sites() ) );
+
+		foreach ( $paths as $path ) {
+			$i = $this->factory->blog->create( array(
+				'path' => "/{$path}/",
+			) );
+			$blogs[ $i ] = $path;
+		}
+
+		$_GET['s'] = $_REQUEST['s'] = $search;
+
+		$this->table->prepare_items();
+
+		$expected = array_keys( array_intersect( $blogs, $matches ) );
+		$this->assertEquals( $expected, wp_list_pluck( $this->table->items, 'blog_id' ) );
+
+	}
+
+	public function data_site_searches() {
+		return array(
+			array(
+				'bc',
+				array(
+					'abc123',
+				),
+			),
+			array(
+				'3',
+				array(
+					'abc123',
+					'three',
+				),
+			),
+		);
+	}
+
+}
+
+endif;