MediaSerializerSubscriber example

$mediaService = $this->createMock(MediaService::class);
        $fileSaver = $this->createMock(FileSaver::class);

        $mediaFolderRepository = $this->createMock(EntityRepository::class);
        $mediaRepository = $this->createMock(EntityRepository::class);

        $mediaSerializer = new MediaSerializer($mediaService, $fileSaver, $mediaFolderRepository, $mediaRepository);
        $mediaSerializer->setRegistry($serializerRegistry);

        $eventDispatcher = new EventDispatcher();
        $eventDispatcher->addSubscriber(new MediaSerializerSubscriber($mediaSerializer));

        $mediaId = Uuid::randomHex();
        $expectedDestination = 'shopware-logo';
        $record = [
            'id' => $mediaId,
            'title' => 'Logo',
            'url' => 'http://172.16.11.80/shopware-logo.png',
            'mediaFolderId' => Uuid::randomHex(),
        ];

        $expectedMediaFile = new MediaFile(