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'));
}