public function testHash()
 {
     $mediaType = $this->prophesize('Temp\\MediaClassifier\\Model\\MediaType');
     $mediaType->__toString()->willReturn('abc');
     $mediaType->getMimetypes()->willReturn([]);
     $mediaType->getHash()->willReturn('abc')->shouldBeCalled();
     $this->mediatypes->add($mediaType->reveal());
     $this->assertNotEmpty($this->mediatypes->getHash());
 }