public void ApplyDiscount_ShouldNotDescreaseTotalAmountValue_IfCartIsEmpty()
{
ShoppingCart shoppingCart = new ShoppingCart();
Coupon coupon = CouponFactory.GenerateCoupon(-1, 20, DiscountType.Amount);
coupon.ApplyDiscount(shoppingCart);
Assert.Equal(0, shoppingCart.DiscountedTotalAmount);
}
public void ApplyDiscount_ShouldApplyDiscount_IfMinimumAmountSatisfied(DiscountType discountType, decimal expected)
{
Category electronicCategory = new Category(CategoryType.Electronic);
Category foodCategory = new Category(CategoryType.Food);
Product television = new Product("Television", 1000, electronicCategory);
Product apple = new Product("Apple", 5, foodCategory);
ShoppingCart shoppingCart = new ShoppingCart();
Coupon coupon = CouponFactory.GenerateCoupon(4000, 20, discountType);
shoppingCart.AddProduct(television, 4);
shoppingCart.AddProduct(apple, 200);
coupon.ApplyDiscount(shoppingCart);
Assert.Equal(expected, shoppingCart.DiscountedTotalAmount);
}
public void ApplyCoupon(Coupon coupon)
{
coupon.ApplyDiscount(this);
}