public void CalculateNewCost_UsesRegularPrice_WhenNotBuyingEnough()
{
BuyNGetMDiscountedEachesGroceryItemSpecial special =
new BuyNGetMDiscountedEachesGroceryItemSpecial(4, 1, 100M);
Assert.AreEqual(3.00M, special.CalculateNewPrice(1.00M, 3));
}
public void CalculateNewCost_ProvidesDiscountForExtraItems_WhenBuyingMultipleOfSaleAmount()
{
BuyNGetMDiscountedEachesGroceryItemSpecial special =
new BuyNGetMDiscountedEachesGroceryItemSpecial(4, 1, 100M);
// buy 4 for $1 each, get one free
Assert.AreEqual(8.00M, special.CalculateNewPrice(1.00M, 10));
}
public void CalculateNewCost_ProvidesFreeItems_WhenBuyingMoreThanRequiredAmountButNotMultipleOfSaleAmount()
{
BuyNGetMDiscountedEachesGroceryItemSpecial special =
new BuyNGetMDiscountedEachesGroceryItemSpecial(3, 3, 100M);
// the special is for buy 3, get 3 free
// but we want the customer to still be able to get 2 free items
// when they have 5 items in their cart
Assert.AreEqual(3.00M, special.CalculateNewPrice(1.00M, 5));
}
