MediaLinkRelationsTest.php

<?php

namespace Drupal\Tests\media\Kernel;

use Drupal\media\Entity\Media;

/**
 * Tests link relationships for media items.
 *
 * @group media
 */
class MediaLinkRelationsTest extends MediaKernelTestBase {
    
    /**
     * Tests that all link relationships for Media exist.
     */
    public function testExistLinkRelationships() {
        
        /** @var \Drupal\Core\Http\LinkRelationTypeManager $link_relation_type_manager */
        $link_relation_type_manager = $this->container
            ->get('plugin.manager.link_relation_type');
        $media = Media::create([
            'bundle' => $this->testMediaType
                ->id(),
        ]);
        $media->save();
        foreach ($media->uriRelationships() as $relation_name) {
            $this->assertTrue($link_relation_type_manager->hasDefinition($relation_name), "Link relationship '{$relation_name}' for a media item");
        }
    }

}