Fix another unit test

tests/unit/content-type-visibility/application/content-type-visibility-watcher-actions-test.php

@@ -21,6 +21,13 @@
  */
 class Content_Type_Visibility_Watcher_Actions_Test extends TestCase {
 
+	/**
+	 * Holds the admin user mock instance.
+	 *
+	 * @var WP_User
+	 */
+	private $admin_user;
+
 	/**
 	 * Holds the Options_Helper instance.
 	 *
@@ -57,6 +64,9 @@ protected function set_up() {
 
 		$this->stubTranslationFunctions();
 
+		$this->admin_user     = Mockery::mock( WP_User::class );
+		$this->admin_user->ID = 1;
+
 		$this->options                            = Mockery::mock( Options_Helper::class );
 		$this->notification_center                = Mockery::mock( Yoast_Notification_Center::class );
 		$this->content_type_dismiss_notifications = Mockery::mock( Content_Type_Visibility_Dismiss_Notifications::class );
@@ -310,10 +320,13 @@ public function test_maybe_add_notification() {
 			[
 				'esc_url'             => 'https://yoa.st/3.0-content-types',
 				'admin_url'           => 'admin.php?page=wpseo_page_settings',
-				'wp_get_current_user' => Mockery::mock( WP_User::class ),
 			]
 		);
 
+		Monkey\Functions\expect( 'wp_get_current_user' )
+			->once()
+			->andReturn( $this->admin_user );
+
 		$this->notification_center
 			->expects( 'add_notification' )
 			->once();