public void GivenNullProduct_WhenApplyDiscount_ThenThrowsException()
{
var discount = new BuyManyGetOneFree();
Assert.Throws <ArgumentNullException>(() =>
{
discount.ApplyDiscount(null);
});
}
public void GivenProduct_WhenApplyDiscountBuy4Get1Free_ThenReturnsCorrectPrice(int qty, int minimumToBuy, decimal price, decimal result)
{
var discount = new BuyManyGetOneFree();
var item = new BasketItem
{
Quantity = qty,
AfterDiscountPrice = 0,
DiscountRuleType = DiscountRuleType.BuyManyGetOneFree,
DiscountParameter = minimumToBuy,
Product = new Product
{
Price = price
}
};
discount.ApplyDiscount(item);
Assert.AreEqual(result, item.AfterDiscountPrice);
}
public void GivenProductHasNotMatchingDiscountRule_WhenApplyDiscount_ThenThrowsException()
{
var discount = new BuyManyGetOneFree();
var item = new BasketItem
{
Quantity = 2,
AfterDiscountPrice = 0,
DiscountRuleType = DiscountRuleType.None,
Product = new Product
{
Price = (decimal)12.33
}
};
Assert.Throws <InvalidOperationException>(() =>
{
discount.ApplyDiscount(item);
});
}
