assertThumbnailExists example

$medias = $this->getNewMediaEntities();
        foreach ($medias as $updatedMedia) {
            $thumbnails = $updatedMedia->getThumbnails();
            static::assertNotNull($thumbnails);
            static::assertEquals(
                2,
                $thumbnails->count()
            );

            foreach ($thumbnails as $thumbnail) {
                $this->assertThumbnailExists($updatedMedia, $thumbnail);
            }
        }
    }

    public function testExecuteWithCustomLimit(): void
    {
        $this->createValidMediaFiles();

        $input = new StringInput('-b 2');
        $output = new BufferedOutput();