diff --git a/tests/phpunit/tests/widgets/media-audio-widget.php b/tests/phpunit/tests/widgets/media-audio-widget.php
index b8ceff3875..02779af2d8 100644
--- a/tests/phpunit/tests/widgets/media-audio-widget.php
+++ b/tests/phpunit/tests/widgets/media-audio-widget.php
@@ -50,6 +50,39 @@ class Test_WP_Widget_Media_Audio extends WP_UnitTestCase {
 		);
 	}
 
+	/**
+	 * Test get_instance_schema filtering.
+	 *
+	 * @covers WP_Widget_Media_Audio::get_instance_schema
+	 *
+	 * @ticket 45029
+	 */
+	function test_get_instance_schema_filtering() {
+		$wp_widget_audio = new WP_Widget_Media_Audio();
+		$schema          = $wp_widget_audio->get_instance_schema();
+
+		add_filter( 'widget_media_audio_instance_schema', array( $this, 'filter_instance_schema' ), 10, 2 );
+		$schema = $wp_widget_audio->get_instance_schema();
+
+		$this->assertTrue( $schema['loop']['default'] );
+	}
+
+	/**
+	 * Filters instance schema.
+	 *
+	 * @since 5.2.0
+	 *
+	 * @param array                 $schema Schema.
+	 * @param WP_Widget_Media_Audio $widget Widget.
+	 *
+	 * @return array
+	 */
+	public function filter_instance_schema( $schema, $widget ) {
+		// Override the default loop value (false).
+		$schema['loop']['default'] = true;
+		return $schema;
+	}
+
 	/**
 	 * Test constructor.
 	 *
diff --git a/tests/phpunit/tests/widgets/media-image-widget.php b/tests/phpunit/tests/widgets/media-image-widget.php
index e138f3e796..eed1fc35df 100644
--- a/tests/phpunit/tests/widgets/media-image-widget.php
+++ b/tests/phpunit/tests/widgets/media-image-widget.php
@@ -34,7 +34,6 @@ class Test_WP_Widget_Media_Image extends WP_UnitTestCase {
 	function test_get_instance_schema() {
 		$widget = new WP_Widget_Media_Image();
 		$schema = $widget->get_instance_schema();
-
 		$this->assertEqualSets(
 			array(
 				'alt',
@@ -57,6 +56,39 @@ class Test_WP_Widget_Media_Image extends WP_UnitTestCase {
 		);
 	}
 
+	/**
+	 * Test schema filtering.
+	 *
+	 * @covers WP_Widget_Media_Image::get_instance_schema
+	 *
+	 * @ticket 45029
+	 */
+	function test_get_instance_schema_filtering() {
+		$widget = new WP_Widget_Media_Image();
+		$schema = $widget->get_instance_schema();
+
+		add_filter( 'widget_media_image_instance_schema', array( $this, 'filter_instance_schema' ), 10, 2 );
+		$schema = $widget->get_instance_schema();
+
+		$this->assertSame( 'large', $schema['size']['default'] );
+	}
+
+	/**
+	 * Filters instance schema.
+	 *
+	 * @since 5.2.0
+	 *
+	 * @param array                 $schema Schema.
+	 * @param WP_Widget_Media_Image $widget Widget.
+	 *
+	 * @return array
+	 */
+	public function filter_instance_schema( $schema, $widget ) {
+		// Override the default size value ('medium').
+		$schema['size']['default'] = 'large';
+		return $schema;
+	}
+
 	/**
 	 * Test constructor.
 	 *
diff --git a/tests/phpunit/tests/widgets/media-video-widget.php b/tests/phpunit/tests/widgets/media-video-widget.php
index e63673d7db..d8961f1f9e 100644
--- a/tests/phpunit/tests/widgets/media-video-widget.php
+++ b/tests/phpunit/tests/widgets/media-video-widget.php
@@ -51,6 +51,39 @@ class Test_WP_Widget_Media_Video extends WP_UnitTestCase {
 		);
 	}
 
+	/**
+	 * Test schema filtering.
+	 *
+	 * @covers WP_Widget_Media_Video::get_instance_schema
+	 *
+	 * @ticket 45029
+	 */
+	function test_get_instance_schema_filtering() {
+		$widget = new WP_Widget_Media_Video();
+		$schema = $widget->get_instance_schema();
+
+		add_filter( 'widget_media_video_instance_schema', array( $this, 'filter_instance_schema' ), 10, 2 );
+		$schema = $widget->get_instance_schema();
+
+		$this->assertTrue( $schema['loop']['default'] );
+	}
+
+	/**
+	 * Filters instance schema.
+	 *
+	 * @since 5.2.0
+	 *
+	 * @param array                 $schema Schema.
+	 * @param WP_Widget_Media_Video $widget Widget.
+	 *
+	 * @return array
+	 */
+	public function filter_instance_schema( $schema, $widget ) {
+		// Override the default loop value (false).
+		$schema['loop']['default'] = true;
+		return $schema;
+	}
+
 	/**
 	 * Test constructor.
 	 *