DiDom\Element::attr PHP Method

    public function attr($name, $value = null)
    {
        if ($value === null) {
            return $this->getAttribute($name);
        }
        return $this->setAttribute($name, $value);
    }

 public function testAttrGet()
 {
     $domElement = $this->createDomElement('input');
     $domElement->setAttribute("value", "test");
     $element = new Element($domElement);
     $this->assertEquals("test", $element->attr("value"));
 }