MediaThumbnailSizeEntity example

$criteria = new Criteria([$media->getId()]);
        $criteria->addAssociation('mediaFolder.configuration.mediaThumbnailSizes');
        /** @var MediaEntity $media */
        $media = $this->mediaRepository->search($criteria, $this->context)->get($media->getId());

        static::assertInstanceOf(MediaFolderEntity::class, $media->getMediaFolder());
        static::assertInstanceOf(MediaFolderConfigurationEntity::class, $media->getMediaFolder()->getConfiguration());

        $media->getMediaFolder()->getConfiguration()->setMediaThumbnailSizes(
            new MediaThumbnailSizeCollection([
                (new MediaThumbnailSizeEntity())->assign([
                    'id' => Uuid::randomHex(),
                    'width' => 1530,
                    'height' => 1530,
                ]),
            ])
        );
        $media->getMediaFolder()->getConfiguration()->setThumbnailQuality(100);

        $filePath = $this->urlGenerator->getRelativeMediaUrl($media);
        $resource = fopen(__DIR__ . '/../fixtures/shopware_optimized.jpg', 'rb');
        \assert($resource !== false);