public void ShouldAddDiscountToDiscounts(
DiscountService sut)
{
IProductDiscount discount = new FakeProductDiscount();
sut.AddProductDiscount(discount);
sut.ProductDiscounts.Should().Contain(discount);
}
public Product(Guid id, string name, string shortDescription, string description, decimal price, Brand brand, CategoryBase category, string mainImage, FakeProductDiscount fakeProductDiscount)
{
Id = id;
Name = name;
MainImage = mainImage;
ShortDescription = shortDescription;
Description = description;
Price = price;
IsActive = true;
Brand = brand;
Category = category;
CreationTime = DateTime.Now;
Discount = fakeProductDiscount;
}
public void ProductsShouldOnlyBeValidForOneDiscount(
DiscountService sut)
{
IProduct product = new ProductFaker().Generate();
Price discountPrice = new Price(product.Price * 0.1m);
IProductDiscount discount = new FakeProductDiscount(discountPrice, product);
// Adding the same discount twice, to it would apply to the product multiple times,
sut.AddProductDiscount(discount);
sut.AddProductDiscount(discount);
Price result = sut.ApplyDiscounts(new[] { product });
result.Should().Be(new Price(product.Price - discountPrice));
}
public void ShouldApplyDiscountToValidProducts(
DiscountService sut)
{
// product1 is valid for discount, product2 is not.
ProductFaker productFaker = new ProductFaker();
IProduct product1 = productFaker.Generate();
IProduct product2 = productFaker.Generate();
Price discountPrice = new Price(product2.Price * 0.5m);
IProductDiscount discount = new FakeProductDiscount(discountPrice, product2);
sut.AddProductDiscount(discount);
Price result = sut.ApplyDiscounts(new[] { product1, product2 });
result.Should().Be(new Price(product1.Price + discountPrice));
}
public void LowestPriceFromAllDiscountsShouldBeApplied(
DiscountService sut)
{
IProduct product = new ProductFaker().Generate();
Price discountPrice1 = new Price(product.Price * 0.1m);
IProductDiscount discount1 = new FakeProductDiscount(discountPrice1, product);
Price discountPrice2 = new Price(product.Price * 0.2m);
IProductDiscount discount2 = new FakeProductDiscount(discountPrice2, product);
// discount2 provides more saving that discount1, so that should be applied.
sut.AddProductDiscount(discount1);
sut.AddProductDiscount(discount2);
Price result = sut.ApplyDiscounts(new[] { product });
result.Should().Be(new Price(product.Price - discountPrice2));
}
