public void AddItem(Product product, int quantity)
{
CartLine line = lineCollection
.FirstOrDefault(p => p.Product.ProductID == product.ProductID);
if (line == null) {
lineCollection.Add(new CartLine {
Product = product,
Quantity = quantity
});
}
else {
line.Quantity += quantity;
}
}
public void Calculate_Cart_Total()
{
Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100 };
Product p2 = new Product { ProductID = 2, Name = "P2", Price = 100 };
Product p3 = new Product { ProductID = 3, Name = "P3", Price = 100 };
Product p4 = new Product { ProductID = 4, Name = "P4", Price = 100 };
//创建一个购物车
Cart cart = new Cart();
cart.AddItem(p1, 10);
cart.AddItem(p2, 2);
Assert.AreEqual(cart.ComputeTotalValue(), 1200);
}
public void Can_Add_New_Lines()
{
Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100 };
Product p2 = new Product { ProductID = 2, Name = "P2", Price = 100 };
Product p3 = new Product { ProductID = 3, Name = "P3", Price = 100 };
Product p4 = new Product { ProductID = 4, Name = "P4", Price = 100 };
Cart cart = new Cart();
cart.AddItem(p1, 10);
cart.AddItem(p2, 2);
var result = cart.Lines.ToArray();
Assert.AreEqual(result.Length, 2);
Assert.AreEqual(result[0].Product, p1);
Assert.AreEqual(result[1].Product, p2);
}
public void Can_Clear_Contents()
{
Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100 };
Product p2 = new Product { ProductID = 2, Name = "P2", Price = 100 };
Product p3 = new Product { ProductID = 3, Name = "P3", Price = 100 };
Product p4 = new Product { ProductID = 4, Name = "P4", Price = 100 };
//创建一个购物车
Cart cart = new Cart();
cart.AddItem(p1, 10);
cart.AddItem(p2, 2);
cart.ClearItem();
Assert.AreEqual(cart.Lines.Count(), 0);
}
public void Can_Remove_Line()
{
Product p1 = new Product { ProductID = 1, Name = "P1", Price = 100 };
Product p2 = new Product { ProductID = 2, Name = "P2", Price = 100 };
Product p3 = new Product { ProductID = 3, Name = "P3", Price = 100 };
Product p4 = new Product { ProductID = 4, Name = "P4", Price = 100 };
//创建一个购物车
Cart cart = new Cart();
cart.AddItem(p1, 10);
cart.AddItem(p2, 2);
cart.AddItem(p1, 3);
cart.RemoveItem(p2);
Assert.AreEqual(cart.Lines.Count(c => c.Product == p2), 0);
Assert.AreEqual(cart.Lines.First(p => p.Product==p1).Quantity, 13);
}
public int RemoveItem(Product product)
{
return lineCollection.RemoveAll(l => l.Product.ProductID == product.ProductID);
}