public IActionResult AddNewTaxCalculation(CalculateTaxModel calculateTaxCommand)
{
var entity = new CalculatedTaxEntity(calculateTaxCommand.PostalCode, calculateTaxCommand.AnnualIncome);
calculationService.CalculateTax(entity);
return(Ok());
}
private static CalculatedTaxEntity CalulateTaxAnPopulateEntity(CalculatedTaxEntity calculatedTaxEntity, ITaxTypeCalculator taxTypeCalculator)
{
var calculatedTaxAmount = taxTypeCalculator.CalulateTax(calculatedTaxEntity.AnnualIncome);
calculatedTaxEntity.CalculatedTaxAmount = calculatedTaxAmount;
return(calculatedTaxEntity);
}
private CalculatedTaxEntity PersistCalculatedTax(CalculatedTaxEntity calculatedTaxEntity)
{
var savedEntity = calculatedTaxRepostiory.Add(calculatedTaxEntity);
calculatedTaxRepostiory.SaveChanges();
return(savedEntity);
}
public Guid CalculateTax(CalculatedTaxEntity calculatedTaxEntity)
{
ValidateEntityIntegrity(calculatedTaxEntity);
var taxTypeCalculator = TaxTypeCalculator(calculatedTaxEntity, taxTypeCalculatorStrategy);
var savedEntity = PersistCalculatedTax(CalulateTaxAnPopulateEntity(calculatedTaxEntity, taxTypeCalculator));
return(savedEntity.Id);
}
private static ITaxTypeCalculator TaxTypeCalculator(CalculatedTaxEntity calculatedTaxEntity, Func <string, ITaxTypeCalculator> taxTypeCalculatorStrategy)
{
var taxTypeCalculator = taxTypeCalculatorStrategy.Invoke(calculatedTaxEntity.PostalCode);
if (taxTypeCalculator == null)
{
throw new ValidationException($"The postal code of {calculatedTaxEntity.PostalCode} is not known.");
}
return(taxTypeCalculator);
}
private static void ValidateEntityIntegrity(CalculatedTaxEntity calculatedTaxEntity)
{
if (calculatedTaxEntity.AnnualIncome < 0)
{
throw new ValidationException("Annaul Income cannot be less than 0");
}
if (string.IsNullOrWhiteSpace(calculatedTaxEntity.PostalCode))
{
throw new ValidationException("Postal Code Cannot be empty");
}
}
public void ShouldCalculateTaxAndPerist()
{
var calculatedTaxEntity = new CalculatedTaxEntity("PostalCode", 5m);
var calculatedTax = fixture.Create <decimal>();
mocktaxTypeCalculatorStrategy.Setup(x => x.Invoke(It.IsAny <string>())).Returns(mockTaxTypeCalculator.Object);
mockTaxTypeCalculator.Setup(x => x.CalulateTax(It.IsAny <decimal>())).Returns(calculatedTax);
mockCalculatedTaxRepostiory.Setup(x => x.Add(It.IsAny <CalculatedTaxEntity>())).Returns(calculatedTaxEntity);
taxCalculationService = new TaxCalculationService(mocktaxTypeCalculatorStrategy.Object, mockCalculatedTaxRepostiory.Object);
taxCalculationService.CalculateTax(calculatedTaxEntity);
mockCalculatedTaxRepostiory.Verify(x => x.Add(It.Is <CalculatedTaxEntity>(y => y.CalculatedTaxAmount == calculatedTax)), Times.Once);
}
