public void Offer_Every_Fourth_Milk_Free()
{
var milkOffer = new MilkOffer();
var products = Enumerable.Repeat(ProductMocks.Milk, 4);
Func <IEnumerable <Product>, decimal> discountCalculator = milkOffer.GetDiscountCalculator();
var discount = discountCalculator(products);
Assert.AreEqual(1.15m, discount);
}
public void Basket_4Milk_Total_3Pounds45()
{
var basket = new Basket();
var products = Enumerable.Repeat(ProductMocks.Milk, 4);
basket.AddProducts(products);
var milkOffer = new MilkOffer();
decimal total = basket
.WithOffers(milkOffer)
.GetTotal();
Assert.AreEqual(3.45m, total);
}
public void Basket_Duplicate_Offers_DoNot_Cumulate()
{
var basket = new Basket();
var products = Enumerable.Repeat(ProductMocks.Milk, 8).ToList();
products.AddRange(new List <Product>
{
ProductMocks.Bread,
ProductMocks.Butter,
ProductMocks.Butter
});
Enumerable.Repeat(ProductMocks.Milk, 8);
basket.AddProducts(products);
var butterOffer = new ButterOffer();
var milkOffer = new MilkOffer();
decimal total = basket
.WithOffers(butterOffer, milkOffer, milkOffer, butterOffer)
.GetTotal();
Assert.AreEqual(9, total);
}
