function it_does_nothing_if_target_quantity_is_below_0($orderItemUnitFactory, OrderItemInterface $orderItem)
 {
     $orderItem->getQuantity()->willReturn(3);
     $orderItemUnitFactory->createForItem(Argument::any())->shouldNotBeCalled();
     $orderItem->addUnit(Argument::any())->shouldNotBeCalled();
     $orderItem->removeUnit(Argument::any())->shouldNotBeCalled();
     $this->modify($orderItem, -10);
 }
 /**
  * @param OrderItemInterface $orderItem
  * @param int $decreaseBy
  */
 private function decreaseUnitsNumber(OrderItemInterface $orderItem, $decreaseBy)
 {
     foreach ($orderItem->getUnits() as $unit) {
         if (0 >= $decreaseBy--) {
             break;
         }
         $orderItem->removeUnit($unit);
     }
 }