Index: tests/phpunit/tests/user/wpPrivacySendRequestConfirmationNotification.php
===================================================================
--- tests/phpunit/tests/user/wpPrivacySendRequestConfirmationNotification.php	(nonexistent)
+++ tests/phpunit/tests/user/wpPrivacySendRequestConfirmationNotification.php	(working copy)
@@ -0,0 +1,208 @@
+<?php
+/**
+ * Test cases for the `_wp_privacy_send_request_confirmation_notification()` function.
+ *
+ * @since 4.9.6
+ */
+
+/**
+ * Tests_User_WpPrivacySendRequestConfirmationNotification class.
+ *
+ * @since 4.9.6
+ *
+ * @group privacy
+ * @group user
+ * @covers _wp_privacy_send_request_confirmation_notification()
+ */
+class Tests_User_WpPrivacySendRequestConfirmationNotification extends WP_UnitTestCase {
+	/**
+	 * Reset the mocked PHPMailer instance before each test method.
+	 *
+	 * @since 4.9.6
+	 */
+	function setUp() {
+		parent::setUp();
+		reset_phpmailer_instance();
+	}
+
+	/**
+	 * Reset the mocked PHPMailer instance after each test method.
+	 *
+	 * @since 4.9.6
+	 */
+	function tearDown() {
+		reset_phpmailer_instance();
+		parent::tearDown();
+	}
+
+	/**
+	 * The function should not send emails when the request ID does not exist.
+	 *
+	 * @ticket 43967
+	 */
+	function test_function_should_not_send_email_when_not_a_valid_request_id() {
+		_wp_privacy_send_request_confirmation_notification( 1234567890 );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertEmpty( $mailer->mock_sent );
+	}
+
+	/**
+	 * The function should not send emails when the ID passed is not a WP_User_Request.
+	 *
+	 * @ticket 43967
+	 */
+	function test_function_should_not_send_email_when_not_a_wp_user_request() {
+		$post_id = $this->factory->post->create( array(
+			'post_type' => 'post',
+		) );
+
+		_wp_privacy_send_request_confirmation_notification( $post_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertEmpty( $mailer->mock_sent );
+	}
+
+	/**
+	 * The function should send an email to the site admin when a user request is confirmed.
+	 *
+	 * @ticket 43211
+	 */
+	public function test_function_should_send_email_to_site_admin_when_user_request_confirmed() {
+		$email      = 'export.request.from.unregistered.user@example.com';
+		$request_id = wp_create_user_request( $email, 'export_personal_data' );
+
+		_wp_privacy_account_request_confirmed( $request_id );
+
+		_wp_privacy_send_request_confirmation_notification( $request_id );
+		$mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertSame( 'request-confirmed', get_post_status( $request_id ) );
+		$this->assertTrue( (bool) get_post_meta( $request_id, '_wp_user_request_confirmed_timestamp', true ) );
+		$this->assertTrue( (bool) get_post_meta( $request_id, '_wp_admin_notified', true ) );
+		$this->assertSame( get_site_option( 'admin_email' ), $mailer->get_recipient( 'to' )->address );
+		$this->assertContains( 'Action Confirmed', $mailer->get_sent()->subject );
+		$this->assertContains( 'Request: Export Personal Data', $mailer->get_sent()->body );
+		$this->assertContains( 'A user data privacy request has been confirmed', $mailer->get_sent()->body );
+	}
+
+	/**
+	 * The function should only send an email to the site admin when a user request is confirmed.
+	 *
+	 * @ticket 43211
+	 */
+	public function test_function_should_only_send_email_to_site_admin_when_user_request_is_confirmed() {
+		$email      = 'export.request.from.unregistered.user@example.com';
+		$request_id = wp_create_user_request( $email, 'export_personal_data' );
+
+		_wp_privacy_send_request_confirmation_notification( $request_id );
+
+		// Non-confirmed request.
+		$this->assertSame( 'request-pending', get_post_status( $request_id ) );
+
+		$mailer = tests_retrieve_phpmailer_instance();
+		// Email not sent.
+		$this->assertEmpty( $mailer->mock_sent );
+		$this->assertEmpty( get_post_meta( $request_id, '_wp_admin_notified', true ) );
+	}
+
+	/**
+	 * The function should only send an email once to the site admin when a user request is confirmed.
+	 *
+	 * @ticket 43211
+	 */
+	public function test_function_should_only_send_email_once_to_admin_when_user_request_is_confirmed() {
+		$email      = 'export.request.from.unregistered.user@example.com';
+		$request_id = wp_create_user_request( $email, 'export_personal_data' );
+
+		_wp_privacy_account_request_confirmed( $request_id );
+
+		_wp_privacy_send_request_confirmation_notification( $request_id );
+		$first_mailer = tests_retrieve_phpmailer_instance();
+		reset_phpmailer_instance();
+		_wp_privacy_send_request_confirmation_notification( $request_id );
+		$second_mailer = tests_retrieve_phpmailer_instance();
+
+		$this->assertSame( 'request-confirmed', get_post_status( $request_id ) );
+		// First email sent.
+		$this->assertNotEmpty( $first_mailer->mock_sent );
+		// Second email not sent.
+		$this->assertEmpty( $second_mailer->mock_sent );
+	}
+
+	/**
+	 * The email address should be filterable.
+	 *
+	 * @ticket 43211
+	 */
+	public function test_email_address_should_be_filterable() {
+		$email      = 'export.request.from.unregistered.user@example.com';
+		$request_id = wp_create_user_request( $email, 'export_personal_data' );
+
+		_wp_privacy_account_request_confirmed( $request_id );
+
+		add_filter( 'user_request_confirmed_email_to', array( $this, 'modify_email_address' ), 10, 2 );
+		_wp_privacy_send_request_confirmation_notification( $request_id );
+		remove_all_filters( 'user_request_confirmed_email_to' );
+
+		$mailer = tests_retrieve_phpmailer_instance();
+		$this->assertSame( $email, $mailer->get_recipient( 'to' )->address );
+	}
+
+	/**
+	 * Filter callback that modifies the recipient of the data request confirmation notification.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param string          $admin_email  The email address of the notification recipient.
+	 * @param WP_User_Request $request_data The request that is initiating the notification.
+	 * @return string Admin email address.
+	 */
+	public function modify_email_address( $admin_email, $request_data ) {
+		$admin_email = $request_data->email;
+		return $admin_email;
+	}
+
+	/**
+	 * The email content should be filterable.
+	 *
+	 * @ticket 43211
+	 */
+	public function test_email_content_should_be_filterable() {
+		$email      = 'export.request.from.unregistered.user@example.com';
+		$request_id = wp_create_user_request( $email, 'export_personal_data' );
+
+		_wp_privacy_account_request_confirmed( $request_id );
+
+		add_filter( 'user_confirmed_action_email_content', array( $this, 'modify_email_content' ), 10, 2 );
+		_wp_privacy_send_request_confirmation_notification( $request_id );
+		remove_filter( 'user_confirmed_action_email_content', array( $this, 'modify_email_content' ), 10 );
+
+		$mailer = tests_retrieve_phpmailer_instance();
+		$this->assertContains( 'Custom content containing email address:' . $email, $mailer->get_sent()->body );
+	}
+
+	/**
+	 * Filter callback that modifies the body of the user request confirmation email.
+	 *
+	 * @since 4.9.6
+	 *
+	 * @param string $email_text Email text.
+	 * @param array  $email_data {
+	 *     Data relating to the account action email.
+	 *
+	 *     @type WP_User_Request $request     User request object.
+	 *     @type string          $user_email  The email address confirming a request
+	 *     @type string          $description Description of the action being performed so the user knows what the email is for.
+	 *     @type string          $manage_url  The link to click manage privacy requests of this type.
+	 *     @type string          $sitename    The site name sending the mail.
+	 *     @type string          $siteurl     The site URL sending the mail.
+	 * }
+	 * @return string Email text.
+	 */
+	public function modify_email_content( $email_text, $email_data ) {
+		$email_text = 'Custom content containing email address:' . $email_data['user_email'];
+		return $email_text;
+	}
+
+}