/**
  * @param ObjectManager $manager
  * @param ShoppingList $shoppingList
  * @param ProductUnit $unit
  * @param Product $product
  * @param string $referenceName
  */
 protected function createLineItem(ObjectManager $manager, ShoppingList $shoppingList, ProductUnit $unit, Product $product, $referenceName)
 {
     $item = new LineItem();
     $item->setNotes('Test Notes');
     $item->setAccountUser($shoppingList->getAccountUser());
     $item->setOrganization($shoppingList->getOrganization());
     $item->setShoppingList($shoppingList);
     $item->setUnit($unit);
     $item->setProduct($product);
     $item->setQuantity(23.15);
     $manager->persist($item);
     $this->addReference($referenceName, $item);
 }