public void DiscountIsTwoMilkWhenEightMilkAndFourRequired()
{
SingleDiscountCalculator milkDiscount = new SingleDiscountCalculator(milk, 4, 1);
Dictionary <Product, int> eightMilk = new Dictionary <Product, int>
{
{ milk, 8 }
};
decimal discount = milkDiscount.CalculateDiscount(eightMilk);
decimal expectedDiscount = milk.Cost * 2;
Assert.AreEqual(expectedDiscount, discount);
}
public void DiscountIsZeroWhenThreeMilkAndFourRequired()
{
SingleDiscountCalculator milkDiscount = new SingleDiscountCalculator(milk, 4, 1);
Dictionary <Product, int> threeMilk = new Dictionary <Product, int>
{
{ milk, 3 }
};
decimal discount = milkDiscount.CalculateDiscount(threeMilk);
decimal expectedDiscount = 0;
Assert.AreEqual(expectedDiscount, discount);
}
public void DiscountIsOneMilkWhenSevenMilkAndFourRequired()
{
SingleDiscountCalculator milkDiscount = new SingleDiscountCalculator(milk, 4, 1);
Dictionary <Product, int> sevenMilk = new Dictionary <Product, int>
{
{ milk, 7 }
};
decimal discount = milkDiscount.CalculateDiscount(sevenMilk);
decimal expectedDiscount = milk.Cost;
Assert.AreEqual(expectedDiscount, discount);
}
public void CanNotCreateSingleCalculatorWithNoRequiredProducts()
{
SingleDiscountCalculator milkDiscount = new SingleDiscountCalculator(milk, 0, 1);
}
