public decimal CalculateNetPayableAmount(IBill bill)
{
var percentageDiscount = PercentageDiscountCalculator.ApplyDiscount(bill.Order);
var fixedDiscount = FixedDiscountCalculator.ApplyDiscount(bill.BillAmount - percentageDiscount);
return(bill.BillAmount - percentageDiscount - fixedDiscount);
}
public void CalculateTest()
{
// Arrange
var order = new Order
{
Price = 100,
Quantity = 2,
OrderDate = DateTime.Parse("2018-03-06 14:00")
};
// Act
IDiscountValidator validator = new HappyHourDiscountValidator(TimeSpan.FromHours(13), TimeSpan.FromHours(16));
IDiscountCalculator calculator = new FixedDiscountCalculator(20);
var orderCalculator = new OrderCalculator(validator, calculator);
var amount = orderCalculator.Calculate(order);
// Assert
Assert.AreEqual(180, amount);
}
