setQuality example

$this->assertEquals('new value', $item->getValue());

        $item->setValue(1);
        $this->assertEquals('1', $item->getValue());
    }

    public function testQuality()
    {
        $item = new AcceptHeaderItem('value', []);
        $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'));
    }

    public function testAttribute()
    {
        $item = new AcceptHeaderItem('value', []);
        $this->assertEquals([], $item->getAttributes());