public void When_Calculating_The_Price_Of_An_Empty_Cart_Price_Should_Be_Zero()
{
var cart = new Cart();
var discounter = MockRepository.GenerateStub<IDiscounter>();
discounter.Expect(x => x.ApplyDiscounts(null)).IgnoreArguments().Return(cart.Books);
var item = new PriceCalculator(discounter);
int expected = 0;
decimal actual = item.CalculatePriceFor(cart);
actual.ShouldEqual(expected);
}
public void When_Calculating_The_Price_Of_Two_Books_Price_Should_Be_The_Sum_Of_Books_Price()
{
var cart = new Cart();
var discounter = MockRepository.GenerateStub<IDiscounter>();
discounter.Expect(x => x.ApplyDiscounts(null)).IgnoreArguments().Return(cart.Books);
var item = new PriceCalculator(discounter);
int expected = 20;
cart.AddBook(new Book("", 10));
cart.AddBook(new Book("", 10));
decimal actual = item.CalculatePriceFor(cart);
actual.ShouldEqual(expected);
}
public decimal CalculatePriceFor(Cart cart)
{
IList<Book> discountedBooks = ApplyDiscounts(cart.Books);
return discountedBooks.Sum(x => x.Price);
}