public void CanMakeTenPercentDiscountOnPepsi()
{
// arrange
var pepsiTenPercentOff = new PercentDiscount {PercentOff = 10m, Product = Pepsi};
_order.AddDiscount(pepsiTenPercentOff);
_order.ApplyDiscounts();
// act
var total = _order.CalculateTotal();
// assert
Assert.Equal(0.9m, total);
}
public void UnableToApplySameDiscountsTwice()
{
// arrange
var pepsiTenPercentOff = new PercentDiscount { PercentOff = 10m, Product = Pepsi };
_order.AddDiscount(pepsiTenPercentOff);
// act
_order.ApplyDiscounts();
_order.ApplyDiscounts();
// assert
var total = _order.CalculateTotal();
Assert.Equal(0.9m, total);
}