public void discount_4th_milk(int quantity, decimal expectedDiscount)
{
Products products = new Products();
AddMilks(products, quantity);
Money discount = _fourthMilkFreeDiscount.ApplyTo(products);
Assert.Equal(new Money(expectedDiscount), discount);
}
public void discount_a_bread_at_50_percent_off(int butterQuantity, int breadQuantity, decimal expectedDiscount)
{
Products products = new Products();
AddButter(products, butterQuantity);
AddBread(products, breadQuantity);
Money discount = fiftyPercentBreadDiscount.ApplyTo(products);
Assert.Equal(new Money(expectedDiscount), discount);
}
public void AddDiscount(IDiscount discount)
{
if(discount.AppliesTo(this))
{
_discounts.Add(discount);
discount.ApplyTo(this);
}
}