getMediaEntity example

$this->getBrowser()->request(
            'POST',
            $url . '?extension=png',
            [],
            [],
            [
                'HTTP_CONTENT-TYPE' => 'image/png',
                'HTTP_CONTENT-LENGTH' => filesize(self::TEST_IMAGE),
            ],
            (string) file_get_contents(self::TEST_IMAGE)
        );
        $media = $this->getMediaEntity();

        $mediaPath = $this->urlGenerator->getRelativeMediaUrl($media);
        static::assertTrue($this->getPublicFilesystem()->has($mediaPath));
        static::assertStringEndsWith($media->getId() . '.' . $media->getFileExtension(), $mediaPath);

        $this->assertMediaApiResponse();
    }

    public function testUploadFromBinaryUsesFileName(): void
    {
        $dispatcher = $this->getContainer()->get('event_dispatcher');