public void Calculate_WhenBaseChargeIncludesACalculatedCharge_ShouldAddMultipleRatesToReverseRatesCollection()
{
// Arrange
var dutyRate = new Rate(5);
var baseCharges = new List <ChargeName> {
ChargeNames.Item, ChargeNames.Duty
};
var orderItem = _orderItemBuilder
.WithVatRate(10)
.Build();
orderItem.AddReverseRate(new ReverseRate("DutyOnItem", ChargeNames.Duty, dutyRate));
var order = _orderBuilder
.WithOrderItems(new List <OrderItem> {
orderItem
})
.Build();
var sut = new ReverseRateCalculator(ChargeNames.Vat, oi => oi.VatRate, baseCharges);
// Act
sut.Calculate(order);
// Assert
orderItem.ReverseRates.Should()
.HaveCount(3).And
.ContainSingle(rr => rr.Rate == orderItem.VatRate && rr.ChargeName.Value == "VatOnItem" && rr.BaseChargeName.Value == ChargeNames.Vat).And
.ContainSingle(rr => rr.Rate == dutyRate && rr.ChargeName.Value == "DutyOnItem" && rr.BaseChargeName.Value == ChargeNames.Duty).And
.ContainSingle(rr => rr.Rate == new Rate(0.5m) && rr.ChargeName.Value == "VatOnDutyOnItem" && rr.BaseChargeName.Value == ChargeNames.Vat);
}
public void Calculate_WhenBaseChargeAlreadyCalculated_ShouldCalculateForwardAndAddCorrectCharge()
{
// Arrange
var baseCharges = new List <ChargeName> {
ChargeNames.Duty
};
var orderItem = _orderItemBuilder
.WithVatRate(10)
.Build();
orderItem.AddCharge(new OrderCharge("DutyOnItem", new Price(CurrencyFakes.EUR, 100), ChargeNames.Duty));
var order = _orderBuilder
.WithOrderItems(new List <OrderItem> {
orderItem
})
.Build();
var sut = new ReverseRateCalculator(ChargeNames.Vat, oi => oi.VatRate, baseCharges);
// Act
sut.Calculate(order);
// Assert
orderItem.ReverseRates.Should().BeEmpty();
orderItem.Charges.Should().ContainSingle(c => c.ChargeName.Value == "VatOnDuty" && c.ChargeAmount.Value == 10);
}
public void Calculate_WhenBaseChargeIsNotACalculatedCharge_ShouldAddRateToReverseRatesCollection()
{
// Arrange
var baseCharges = new List <ChargeName> {
ChargeNames.Item
};
var orderItem = _orderItemBuilder
.WithVatRate(10)
.Build();
var order = _orderBuilder
.WithOrderItems(new List <OrderItem> {
orderItem
})
.Build();
var sut = new ReverseRateCalculator(ChargeNames.Vat, oi => oi.VatRate, baseCharges);
// Act
sut.Calculate(order);
// Assert
orderItem.ReverseRates.Should()
.ContainSingle(rr => rr.Rate == orderItem.VatRate && rr.ChargeName.Value == "VatOnItem" && rr.BaseChargeName.Value == ChargeNames.Vat);
}
public static Calculator?Create(CalculationRange range, IEnumerable <ChargeName> deminimisBaseCharges)
{
Calculator?calculatorDelegate = null;
foreach (var config in range.ChargeConfigurations)
{
IChargeCalculator calculator;
switch (config)
{
// FIXED RATE CONFIGURATIONS
case FixedRateChargeConfiguration fixedChargeConfig when config is FixedRateChargeConfiguration:
{
calculator = new FixedChargeCalculator(fixedChargeConfig.ChargeName, fixedChargeConfig.FixedChargeAmount);
break;
}
// WEIGHT BASED CONFIGURATIONS
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && weightBasedChargeConfig.Rate != null:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => weightBasedChargeConfig.Rate);
break;
}
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && config.ChargeName.Value is ChargeNames.Duty:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => oi.DutyRate);
break;
}
case WeightBasedChargeConfiguration weightBasedChargeConfig when config is WeightBasedChargeConfiguration && config.ChargeName.Value is ChargeNames.Vat:
{
calculator = new WeightBasedChargeCalculator(weightBasedChargeConfig.ChargeName, (oi) => oi.VatRate);
break;
}
// RATE BASED CONFIGURATIONS
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.Rate != null:
{
calculator = new ReverseRateCalculator(rateBasedChargeConfig.ChargeName, (oi) => rateBasedChargeConfig.Rate, rateBasedChargeConfig.BaseCharges);
break;
}
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.ChargeName.Value is ChargeNames.Duty:
{
calculator = new ReverseRateCalculator(rateBasedChargeConfig.ChargeName, (oi) => oi.DutyRate, rateBasedChargeConfig.BaseCharges);
break;
}
case RateBasedChargeConfiguration rateBasedChargeConfig when config is RateBasedChargeConfiguration && rateBasedChargeConfig.ChargeName.Value is ChargeNames.Vat:
{
calculator = new ReverseRateCalculator(rateBasedChargeConfig.ChargeName, (oi) => oi.VatRate, rateBasedChargeConfig.BaseCharges);
break;
}
default:
throw new InvalidChargeConfigurationException("Unknown charge configuration - can't create calculator delegate.");
}
// Add created calculator to delegate
calculatorDelegate += calculator.Calculate;
}
foreach (var deminimisBaseCharge in deminimisBaseCharges)
{
// Add the item price calculator last
calculatorDelegate += new ReversePriceCalculator(deminimisBaseCharge, $"Input{deminimisBaseCharge}").Calculate;
}
return(calculatorDelegate);
}
