public void FillInPrices_ValidInputProvided_ReturnsCorrectAmounts(
decimal netAmountInput, decimal grossAmountInput, decimal vatAmountInput,
decimal vatRate,
decimal expectedNet, decimal expectedGross, decimal expectedVatAmount)
{
// Arrange
var service = CreateService();
PriceDetailsInput details = new PriceDetailsInput()
{
NetAmount = netAmountInput,
GrossAmount = grossAmountInput,
VatAmount = vatAmountInput,
VatRate = vatRate
};
// Act
var calculatedPrice = service.GetCalculatedPrice(
details);
// Assert
Assert.Equal(expectedNet, calculatedPrice.NetAmount);
Assert.Equal(expectedGross, calculatedPrice.GrossAmount);
Assert.Equal(expectedVatAmount, calculatedPrice.VatAmount);
_mockRepository.VerifyAll();
}
public PriceDetails Calculate(PriceDetailsInput details)
{
if (!details.NetAmount.HasValue)
{
throw new ArgumentNullException(nameof(details.NetAmount));
}
if (details.VatRate <= 0 || details.VatRate > 100)
{
throw new ArgumentOutOfRangeException(nameof(details.VatRate));
}
var vatAmount = details.NetAmount.Value * details.VatRate / 100;
var grossAmount = details.NetAmount.Value + vatAmount;
return(new PriceDetails(details.NetAmount.Value, grossAmount, vatAmount));
}
public PriceDetails Calculate(PriceDetailsInput details)
{
if (!details.VatAmount.HasValue)
{
throw new ArgumentNullException(nameof(details.VatAmount));
}
if (details.VatRate <= 0 || details.VatRate > 100)
{
throw new ArgumentOutOfRangeException(nameof(details.VatRate));
}
var netAmount = 100 / details.VatRate * details.VatAmount.Value;
var grossAmount = netAmount + details.VatAmount.Value;
return(new PriceDetails(netAmount, grossAmount, details.VatAmount.Value));
}
private IPriceCalculationStrategy ChoosePriceCalculationStrategy(PriceDetailsInput details)
{
if (details.NetAmount.HasValue && details.NetAmount.Value > 0)
{
return(new PriceCalculationFromNetAmountStrategy());
}
if (details.GrossAmount.HasValue && details.GrossAmount.Value > 0)
{
return(new PriceCalculationFromGrossAmountStrategy());
}
if (details.VatAmount.HasValue && details.VatAmount.Value > 0)
{
return(new PriceCalculationFromVatAmountStrategy());
}
_logger.LogWarning("Unexpected State: No data to perform calculation. Vat ammount, net ammount and gross amount were all null");
throw new ArgumentException("Unexpected State: No data to perform calculation. Vat ammount, net ammount and gross amount were all null");
}
public void FillInPrices_NoValidDataProided_ArgumentExceptionRaised(
decimal netAmountInput, decimal grossAmountInput, decimal vatAmountInput,
decimal vatRate)
{
// Arrange
var service = CreateService();
PriceDetailsInput details = new PriceDetailsInput()
{
NetAmount = netAmountInput,
GrossAmount = grossAmountInput,
VatAmount = vatAmountInput,
VatRate = vatRate
};
// Act and Assert
Assert.Throws <ArgumentException>(() => service.GetCalculatedPrice(
details));
_mockRepository.VerifyAll();
}
public PriceDetails GetCalculatedPrice(PriceDetailsInput details)
{
IPriceCalculationStrategy priceCalculationStrategy = ChoosePriceCalculationStrategy(details);
return(priceCalculationStrategy.Calculate(details));
}