MediaThumbnailCollection example

        /** @var MediaEntity $media */
        foreach ($event->getEntities() as $media) {
            if ($media->getMediaTypeRaw()) {
                $media->setMediaType(unserialize($media->getMediaTypeRaw()));
            }

            if ($media->getThumbnails() === null) {
                if ($media->getThumbnailsRo()) {
                    $media->setThumbnails(unserialize($media->getThumbnailsRo()));
                } else {
                    $media->setThumbnails(new MediaThumbnailCollection());
                }
            }
        }
    }

    private function addThumbnailUrl(MediaThumbnailEntity $thumbnail, MediaEntity $media): void
    {
        $thumbnail->setUrl(
            $this->urlGenerator->getAbsoluteThumbnailUrl(
                $media,
                $thumbnail
            )

$subscriber = $this->getContainer()->get(MediaLoadedSubscriber::class);
        $context = Context::createDefaultContext();

        $mediaId = '34556f108ab14969a0dcf9d9522fd7df';
        $mimeType = 'image/png';

        $mediaEntity = new MediaEntity();
        $mediaEntity->setId($mediaId);
        $mediaEntity->setMimeType($mimeType);
        $mediaEntity->setFileExtension('png');
        $mediaEntity->setFileName($mediaId . '-134578345');
        $mediaEntity->setThumbnails(new MediaThumbnailCollection());

        $mediaLoadedEvent = new EntityLoadedEvent($this->getContainer()->get(MediaDefinition::class), [$mediaEntity], $context);
        $subscriber->addUrls($mediaLoadedEvent);

        static::assertStringEndsWith(
            $mediaEntity->getFileName() . '.' . $mediaEntity->getFileExtension(),
            $mediaEntity->getUrl()
        );
        static::assertEquals([], $mediaEntity->getThumbnails()->getElements());
    }

    

$strict = \func_get_args()[2] ?? false;

        if ($config->getMediaThumbnailSizes() === null) {
            return 0;
        }
        if ($media->getThumbnails() === null) {
            return 0;
        }

        $toBeCreatedSizes = new MediaThumbnailSizeCollection($config->getMediaThumbnailSizes()->getElements());
        $toBeDeletedThumbnails = new MediaThumbnailCollection($media->getThumbnails()->getElements());

        foreach ($toBeCreatedSizes as $thumbnailSize) {
            foreach ($toBeDeletedThumbnails as $thumbnail) {
                if (!$this->isSameDimension($thumbnail, $thumbnailSize)) {
                    continue;
                }

                if ($strict === true
                    && !$this->getFileSystem($media)->fileExists($this->urlGenerator->getRelativeThumbnailUrl($media, $thumbnail))) {
                    continue;
                }