Issue #2905738 by vaplas, Wim Leers: Media::setOwnerId() doesn't return the Media entity

core/modules/media/src/Entity/Media.php

@@ -152,7 +152,7 @@ public function getOwnerId() {
    * {@inheritdoc}
    */
   public function setOwnerId($uid) {
-    $this->set('uid', $uid);
+    return $this->set('uid', $uid);
   }
 
   /**

core/modules/media/tests/src/Kernel/MediaTest.php

+<?php
+
+namespace Drupal\Tests\media\Kernel;
+
+use Drupal\media\Entity\Media;
+
+/**
+ * Tests Media.
+ *
+ * @group media
+ */
+class MediaTest extends MediaKernelTestBase {
+
+  /**
+   * Tests various aspects of a Media entity.
+   */
+  public function testEntity() {
+    $media = Media::create(['bundle' => $this->testMediaType->id()]);
+
+    $this->assertSame($media, $media->setOwnerId($this->user->id()), 'setOwnerId() method returns its own entity.');
+  }
+
+}