public void CalculateNewCost_UsesRegularPrice_WhenNotBuyingEnough()
{
BuyNForXEachesGroceryItemSpecial special =
new BuyNForXEachesGroceryItemSpecial(3, 5.00M);
Assert.AreEqual(3.48M, special.CalculateNewPrice(1.74M, 2));
}
public void CalculateNewCost_IsMultipleOfFixedPrice_WhenBuyingMultipleOfRequiredCount()
{
BuyNForXEachesGroceryItemSpecial special =
new BuyNForXEachesGroceryItemSpecial(3, 5.00M);
Assert.AreEqual(15.00M, special.CalculateNewPrice(1.89M, 9));
}
public void CalculateNewCost_IsFixedPrice_WhenBuyingExactAmount()
{
decimal expectedPrice = 5.00M;
BuyNForXEachesGroceryItemSpecial special =
new BuyNForXEachesGroceryItemSpecial(3, expectedPrice);
Assert.AreEqual(expectedPrice, special.CalculateNewPrice(1.89M, 3));
}
public void CalculateNewCost_UsesRegularPriceForOddItems_WhenNotBuyingAmountThatIsNotAMultipleOfRequiredCount()
{
BuyNForXEachesGroceryItemSpecial special =
new BuyNForXEachesGroceryItemSpecial(3, 5.00M);
// the first 3 should cost 5.00M
// the last 2 should cost (1.74M) * 2 = 3.48
// total should be 8.48M
Assert.AreEqual(8.48M, special.CalculateNewPrice(1.74M, 5));
}
