public void apply_all_individual_discounts()
{
Products products = new Products();
AddProduct(products, new Butter(2));
AddProduct(products, new Bread(1));
AddProduct(products, new Milk(4));
Money discount = _discounts.ApplyTo(products);
var severalDiscountsApplied = new Money(1.65m);
Assert.Equal(severalDiscountsApplied, discount);
}
public Money Total()
{
return(_products.TotalCost() - _discounts.ApplyTo(_products));
}