public function testQuality()
 {
     $item = new AcceptHeaderItem('value', array());
     $this->assertEquals(1.0, $item->getQuality());
     $item->setQuality(0.5);
     $this->assertEquals(0.5, $item->getQuality());
     $item->setAttribute('q', 0.75);
     $this->assertEquals(0.75, $item->getQuality());
     $this->assertFalse($item->hasAttribute('q'));
 }