public function testGetSet()
 {
     $mimes = ['foo' => 'application/x-foo', 'bar' => 'application/x-bar'];
     $guesser = new FileExtMimeTypeGuesser();
     $this->assertNotEquals($mimes, $guesser->getMimes());
     $this->assertNull($guesser->guess('bazz.bar'));
     $this->assertNull($guesser->guess('bazz.foo'));
     $guesser->setMimes($mimes);
     $this->assertEquals($mimes, $guesser->getMimes());
     $this->assertEquals($mimes['bar'], $guesser->guess('bazz.bar'));
     $this->assertEquals($mimes['foo'], $guesser->guess('bazz.foo'));
 }