public function testConcreteMime()
 {
     $this->assertEquals('audio/x-wav', (string) ContentType::byString(file_get_contents(__DIR__ . '/data/sample.MP3')));
 }
 /**
  * @param string $expectedContentType
  * @param string $fileName
  * @dataProvider filesAndItsContentTypes
  */
 public function testPortableDocumentFormat($expectedContentType, $fileName)
 {
     $this->assertEquals($expectedContentType, ContentType::byString(file_get_contents(__DIR__ . '/data/' . $fileName)));
 }