public RedirectToRouteResult ChangeQuantity(Cart cart, int productId, string returnUrl, int quantity=0)
{
if (quantity < 1) quantity = 1;
var product = _repository.Products.FirstOrDefault(p => p.ProductID == productId);
if (product != null) cart.ChangeQuantity(product, quantity);
return RedirectToAction("Index", new {returnUrl});
}
public void Can_Change_Quantity()
{
var p1 = new Product { ProductID = 1, Name = "P1", StandardCost= 100M };
// var p2 = new Product { ProductID = 2, Name = "P2", Price = 50M };
var target = new Cart();
target.AddItem(p1, 1);
target.ChangeQuantity(p1, 5);
Assert.AreEqual(target.Lines.ElementAt(0).Quantity, 5);
}