AddProductForm::setMaximumQuantity PHP Метод

    public function setMaximumQuantity($qty)
    {
        $this->maxquantity = (int) $qty;
        return $this;
    }

 public function testForm()
 {
     $controller = new Product_Controller($this->objFromFixture("Product", "socks"));
     $form = new AddProductForm($controller);
     $form->setMaximumQuantity(10);
     $this->markTestIncomplete("test can't go over max quantity");
     $data = array('Quantity' => 4);
     $form->addtocart($data, $form);
     $this->markTestIncomplete('check quantity');
 }