public async Task CalculateTaxAsync_WhenValidPostalCode_ShouldUseCorrectTaxCalculator(TaxType taxType, decimal annualIncome, string postalCode)
{
// Arrange
var loggerMock = Substitute.For <ILogger <TaxCalculatorController> >();
var factory = TestHelper.GetTaxRateCalculatorFactorySubstitude(annualIncome);
var taxQueryServiceSubstitude = Substitute.For <ITaxQueryService>();
taxQueryServiceSubstitude.GetTaxCalculationTypeByPostalCodeAsync(Arg.Any <string>()).Returns(Task.FromResult(taxType));
var taxCommandServiceSubstitude = Substitute.For <ITaxCommandService>();
var controller = new TaxCalculatorController(loggerMock, factory, taxQueryServiceSubstitude, taxCommandServiceSubstitude);
var request = new TaxCalculationRequest
{
PostalCode = postalCode,
AnnualIncome = annualIncome,
};
// Act
var response = await controller.CalculateTaxAsync(request);
// Assert
var okResult = response as OkObjectResult;
factory.Received(1)(Arg.Is <TaxType>(value => value == taxType));
okResult.ShouldNotBeNull();
okResult.StatusCode.ShouldBe(200);
okResult.Value.ShouldBeOfType <ApiResponse <TaxCalculationResponse> >();
var okResultObj = okResult.Value as ApiResponse <TaxCalculationResponse>;
okResultObj.Payload.TaxAmountPayable.ShouldBe(annualIncome);
}
public async Task <OperationResult <TaxCalculationResponse> > CalculateTax(TaxCalculationRequest request)
{
OperationResult <TaxCalculationResponse> validatorResult = _validationRuleEngine.Validate(request);
if (validatorResult.HasErrors)
{
return(validatorResult);
}
var calculationTypeMapping = await _calculationMappingRepository.GetByPostalCodeAsync(request.PostalCode).ConfigureAwait(false);
var taxCalculator = _taxCalculatorFactory.GetCalculator(calculationTypeMapping.CalculationType);
var taxYear = await _taxYearRepository.GetTaxYearAsync(_clock.GetCurrentDateTime()).ConfigureAwait(false);
var taxAmountResult = await taxCalculator.CalculateTaxAsync(taxYear, request.AnnualIncome).ConfigureAwait(false);
if (taxAmountResult.HasErrors)
{
return(taxAmountResult.MapErrors <TaxCalculationResponse>());
}
var response = new TaxCalculationResponse
{
TaxYear = taxYear.ToString(),
CalculationType = calculationTypeMapping.CalculationType,
TaxAmount = taxAmountResult.Response
};
await SaveCalculation(request, response, taxYear);
return(new OperationResult <TaxCalculationResponse>(response));
}
public async Task CalculateTax_Should_Return_ValidationRuleEngine_Errors()
{
//Arrange
var calculationRequest = new TaxCalculationRequest();
var validationRuleEngineResult = new OperationResult <TaxCalculationResponse>();
const string expectedErrorKey1 = "1232";
const string expectedErrorMessage1 = "This is an error";
validationRuleEngineResult.AddErrorMessage(expectedErrorKey1, expectedErrorMessage1);
const string expectedErrorKey2 = "error2";
const string expectedErrorMessage2 = "This is an error number2";
validationRuleEngineResult.AddErrorMessage(expectedErrorKey2, expectedErrorMessage2);
const int expectedErrorCount = 2;
_validationRuleEngine.Setup(s => s.Validate(calculationRequest))
.Returns(validationRuleEngineResult);
//Act
var operationResult = await _calculatorManager.CalculateTax(calculationRequest);
//Assert
Assert.IsTrue(operationResult.HasErrors);
var actualErrors = operationResult.GetErrorMessages();
Assert.AreEqual(expectedErrorCount, actualErrors.Count);
Assert.IsTrue(actualErrors.Any(e => e.Key == expectedErrorKey1 && e.Value.Contains(expectedErrorMessage1)));
Assert.IsTrue(actualErrors.Any(e => e.Key == expectedErrorKey2 && e.Value.Contains(expectedErrorMessage2)));
}
public async Task <TaxJarCalculateResponse> Calculate(TaxCalculationRequest request)
{
OrderModel mapped = mapper.Map <OrderModel>(request);
//NOTE: Returning mocked data so clientId isn't used right now
ClientModel client = clientService.GetClient(mapped.ClientId);
ProductModel product = productService.GetProduct(request.ProductId);
var lineItems = new List <Models.LineItem>
{
mapper.Map <Models.LineItem>(product)
};
mapped.LineItems = lineItems;
mapped.FromCity = client.City;
mapped.FromCountry = client.Country;
mapped.FromState = client.State;
mapped.FromStreet = client.Street;
mapped.FromZip = client.Zip;
TaxJarCalculateResponse response = null;
response = await taxRepository.Post <OrderModel, TaxJarCalculateResponse>(mapped);
//TODO: Add mapping to TaxCalculationResposne, but for sake of time, return object from TaxJar. I would like to flatten this response out eventually.
return(response);
}
public IActionResult ProcessCalculation([FromForm] TaxCalculationRequest request)
{
var result = _apiFacade.CalculateTax(new CalculationRequest()
{
//user id gets set via the auth token (if i get that far)
PostalCode = request.PostalCode,
TaxableAmount = request.TaxableAmount,
UserId = UserId
});
ViewBag.Message = string.IsNullOrWhiteSpace(result.ErrorMessage)? $"The assessed tax is {result.AssessedAmount.ToString("##0.00")}":result.ErrorMessage;
return(View("Calculation"));
}
private async Task SaveCalculation(TaxCalculationRequest request, TaxCalculationResponse response, TaxYear taxYear)
{
var calculation = new TaxCalculation
{
AnnualIncome = request.AnnualIncome,
TaxAmount = response.TaxAmount,
CalculationType = response.CalculationType,
CreatedBy = request.RequestedBy,
CreationDate = _clock.GetCurrentDateTime(),
PostalCode = request.PostalCode,
TaxYear = taxYear
};
await _calculationRepository.AddAsync(calculation).ConfigureAwait(false);
}
public async Task <IActionResult> Post([FromBody] TaxCalculationRequest request)
{
try
{
if (request == null)
{
return(BadRequest("Invalid Request"));
}
//TODO: Recommended to get clientId from Auth token/Identity unless an 'agent' is selecting clients in the app
if (string.IsNullOrEmpty(request.ClientId))
{
return(BadRequest("ClientId is Required"));
}
if (string.IsNullOrEmpty(request.ToCountry))
{
return(BadRequest("Ship to Country is Required"));
}
if (string.IsNullOrEmpty(request.ToState))
{
return(BadRequest("Ship to State is Required"));
}
if (request.Shipping == 0)
{
return(BadRequest("Total amount to Ship is Required"));
}
if (request.ToCountry == "US" || request.ToCountry == "CA")
{
if (string.IsNullOrEmpty(request.ToZip))
{
return(BadRequest("Zip is required if US or CA is the Country"));
}
}
TaxJarCalculateResponse calculation = await taxService.Calculate(request);
return(Ok(JsonConvert.SerializeObject(calculation)));
}
catch (Exception ex)
{
return(BadRequest());
}
}
public async Task CalculateTax_Should_Return_Calculation_Errors()
{
//Arrange
var calculationRequest = new TaxCalculationRequest();
var taxCalculationResult = new OperationResult <decimal>();
const string expectedErrorKey1 = "calcError1";
const string expectedErrorMessage1 = "This is a calc error";
taxCalculationResult.AddErrorMessage(expectedErrorKey1, expectedErrorMessage1);
const string expectedErrorKey2 = "calcError2";
const string expectedErrorMessage2 = "This is calc error number2";
taxCalculationResult.AddErrorMessage(expectedErrorKey2, expectedErrorMessage2);
const int expectedErrorCount = 2;
_validationRuleEngine.Setup(s => s.Validate(calculationRequest))
.Returns(new OperationResult <TaxCalculationResponse>());
_calculationMappingRepository.Setup(f => f.GetByPostalCodeAsync(calculationRequest.PostalCode))
.ReturnsAsync(new PostalCodeCalculationTypeMapping());
_taxCalculatorFactory.Setup(f => f.GetCalculator(It.IsAny <TaxCalculationType>()))
.Returns(_taxCalculator.Object);
_taxYearRepository.Setup(t => t.GetTaxYearAsync(It.IsAny <DateTime>()))
.ReturnsAsync(new TaxYear());
_taxCalculator.Setup(t => t.CalculateTaxAsync(It.IsAny <TaxYear>(), calculationRequest.AnnualIncome))
.ReturnsAsync(taxCalculationResult);
//Act
var operationResult = await _calculatorManager.CalculateTax(calculationRequest);
//Assert
Assert.IsTrue(operationResult.HasErrors);
var actualErrors = operationResult.GetErrorMessages();
Assert.AreEqual(expectedErrorCount, actualErrors.Count);
Assert.IsTrue(actualErrors.Any(e => e.Key == expectedErrorKey1 && e.Value.Contains(expectedErrorMessage1)));
Assert.IsTrue(actualErrors.Any(e => e.Key == expectedErrorKey2 && e.Value.Contains(expectedErrorMessage2)));
}
public async Task Calculate_Should_Calculate()
{
//Arrange
const decimal annualIncome = 250000;
const string postalCode = "1234";
const string expectedTaxYear = "Tax Year";
const decimal expectedTaxAmount = 234.56M;
const TaxCalculationType expectedCalculationType = TaxCalculationType.PROGRESSIVE_TAX;
string expectedCalculationTypeDescription = expectedCalculationType.GetDescription();
TaxCalculationRequestModel model = new TaxCalculationRequestModel
{
AnnualIncome = annualIncome,
PostalCode = postalCode
};
TaxCalculationRequest actualManagerRequest = null;
TaxCalculationResponse managerResponse = new TaxCalculationResponse
{
CalculationType = expectedCalculationType,
TaxAmount = expectedTaxAmount,
TaxYear = expectedTaxYear
};
_manager.Setup(r => r.CalculateTax(It.IsAny <TaxCalculationRequest>()))
.Callback((TaxCalculationRequest r) => actualManagerRequest = r)
.ReturnsAsync(() => new OperationResult <TaxCalculationResponse>(managerResponse));
//Act
var result = await _controller.Calculate(model);
//Assert
Assert.IsInstanceOf <OkObjectResult>(result.Result);
TaxCalculationResponseModel
responseMode = (TaxCalculationResponseModel)((OkObjectResult)result.Result).Value;
Assert.AreEqual(expectedCalculationTypeDescription, responseMode.CalculationType);
Assert.AreEqual(expectedTaxYear, responseMode.TaxYear);
Assert.AreEqual(expectedTaxAmount, responseMode.TaxAmount);
_manager.Verify(f => f.CalculateTax(It.IsAny <TaxCalculationRequest>()), Times.Once);
Assert.AreEqual(annualIncome, actualManagerRequest.AnnualIncome);
Assert.AreEqual(postalCode, actualManagerRequest.PostalCode);
}
public async Task <ActionResult <TaxCalculationResponse> > PostAsync([FromBody] TaxCalculationRequest request)
{
try
{
// retrieve the username from the JWT claims
var requestedByUser = HttpContext?.User?.Identity?.Name;
// execute main tax calculation logic
var(statusCode, response) = await _taxCalculationService.CalculateAsync(request, requestedByUser);
return(StatusCode((int)statusCode, response));
}
catch (Exception)
{
return(StatusCode(500, new TaxCalculationResponse
{
Message = $"Error while processing tax calculation request for {nameof(request.PostalCode)} - {request.PostalCode ?? ("Unknown")} and {nameof(request.AnnualIncome)} - {request.AnnualIncome}."
}));
}
}
public async Task Calculate_Should_Return_BadRequest_When_Manager_Returns_Errors()
{
//Arrange
const decimal annualIncome = 250000;
const string postalCode = "1234";
var expectedErrorMessage = "my errors";
var errorKey = "errorKey";
TaxCalculationRequestModel model = new TaxCalculationRequestModel
{
AnnualIncome = annualIncome,
PostalCode = postalCode
};
TaxCalculationRequest actualManagerRequest = null;
var managerResult = new OperationResult <TaxCalculationResponse>();
managerResult.AddErrorMessage(errorKey, expectedErrorMessage);
_manager.Setup(r => r.CalculateTax(It.IsAny <TaxCalculationRequest>()))
.Callback((TaxCalculationRequest r) => actualManagerRequest = r)
.ReturnsAsync(() => managerResult);
//Act
var result = await _controller.Calculate(model);
//Assert
Assert.IsInstanceOf <BadRequestObjectResult>(result.Result);
var
responseModel = (SerializableError)((BadRequestObjectResult)result.Result).Value;
Assert.AreEqual(expectedErrorMessage, ((string[])responseModel[errorKey])[0]);
_manager.Verify(f => f.CalculateTax(It.IsAny <TaxCalculationRequest>()), Times.Once);
Assert.AreEqual(annualIncome, actualManagerRequest.AnnualIncome);
Assert.AreEqual(postalCode, actualManagerRequest.PostalCode);
}
public async Task <IActionResult> CalculateTaxAsync([FromBody] TaxCalculationRequest taxCalculationRequest)
{
var taxType = await _taxQueryService.GetTaxCalculationTypeByPostalCodeAsync(taxCalculationRequest.PostalCode);
var calculator = _taxRateCalculatorFactory(taxType);
var taxAmountPayable = await calculator.CalculateTaxAmountAsync(taxCalculationRequest.AnnualIncome);
await _taxCommandService.CreateTaxCalculationHistoryAsync(new TaxCalculatorHistoryRequest
{
AnnualIncome = taxCalculationRequest.AnnualIncome,
PostalCode = taxCalculationRequest.PostalCode,
CalculatedTax = taxAmountPayable,
CalculationType = taxType
});
var response = new TaxCalculationResponse
{
TaxCalculationType = taxType,
TaxAmountPayable = taxAmountPayable
};
return(OkApiResponse(response));
}
/// <summary>
/// Makes an HTTP request to the TaxCalculation API to calculate the tax ammount for a given postal code and annual income
/// </summary>
/// <param name="postalCode">Postal code</param>
/// <param name="annualIncome">Total annual income</param>
/// <returns>TaxCalculationResponse</returns>
public async Task <TaxCalculationResponse> CalculateAsync(string postalCode, decimal annualIncome)
{
try
{
var endpointUri = new Uri($"{_apiGatewayUri}api/v1/calculateTax");
var request = new TaxCalculationRequest
{
PostalCode = postalCode,
AnnualIncome = annualIncome
};
using (var client = new GenericHttpClient <TaxCalculationResponse>(endpointUri))
{
return(await client.PostAsync(request));
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Error while trying to tax caluclation request to the PostalCodeTax API.");
// rethrow to preserve stack details
throw;
}
}
/// <summary>
/// Main service method that facilitates the tax calculation request.
/// </summary>
/// <param name="request">TaxCalculationRequest object</param>
/// <param name="requestBy">Username of person that requested the tax calculation</param>
/// <returns>HTTP Status Code + TaxCalculationResponse</returns>
public async Task <Tuple <HttpStatusCode, TaxCalculationResponse> > CalculateAsync(TaxCalculationRequest request, string requestedBy)
{
try
{
var postalCode = request.PostalCode;
// first retrieve the tax type for the given postal Code
var taxType = await _postalCodeTaxRepository.GetAsync(postalCode);
// if unknown, it means it is a client error, thus respond with 400 - Bad Request
if (taxType == TaxType.Unknown)
{
return(new Tuple <HttpStatusCode, TaxCalculationResponse>(
HttpStatusCode.BadRequest,
new TaxCalculationResponse
{
Message = $"The {nameof(postalCode)}: {postalCode} that was provided is not a valid {nameof(postalCode)}"
}));
}
// let the factory method resolve the correct implementation of ITaxCalculation without exposing the creation logic of the factory to the client
var taxCalculation = _taxCalculationResolver(taxType);
var annualIncome = request.AnnualIncome;
// execute main tax calculation logic
var taxAmount = await taxCalculation.CalculateAsyc(annualIncome);
// use a builder to separate the construction of the TaxCalculationModel from its representation
var model = new TaxCalculationModelBuilder()
.AddPostalCode(postalCode)
.AddAnnualIncome(annualIncome)
.AddTaxAmount(taxAmount)
.AddRequestedBy(requestedBy)
.Build();
// then store the tax results to the database
var persisted = await _taxCalculationRepository.SaveAsync(model);
// use a builder to separate the construction of the complex Tuple result object from its representation
var result = new ResultBuilder(persisted)
.AddTaxAmount(taxAmount)
.AddTaxType(taxType)
.Build();
return(result);
}
catch (Exception ex)
{
_logger.LogError(ex, $"Error while trying to calculate tax for postal code - {request?.PostalCode ?? ("Unknown")} and annual income - {request.AnnualIncome}.");
// rethrow to preserve stack details
throw;
}
}
public async Task CalculateTax_Should_Save_Successfully_Calculated_Tax()
{
//Arrange
const string expectedPostalCode = "12234";
const decimal expectedAnnualIncome = 23000M;
const int expectedTaxAmount = 100;
const TaxCalculationType expectedCalculationType = TaxCalculationType.PROGRESSIVE_TAX;
DateTime expectedCreationDate = new DateTime(2020, 12, 16);
Guid expectedRequestedBy = Guid.Parse("e64a32e6-f2a9-43d5-b87b-79c845955f93");
var calculationRequest = new TaxCalculationRequest()
{
AnnualIncome = expectedAnnualIncome,
PostalCode = expectedPostalCode,
RequestedBy = expectedRequestedBy
};
TaxCalculation savedRecord = null;
var taxYear = new TaxYear
{
FromDate = new DateTime(2020, 01, 01),
ToDate = new DateTime(2021, 01, 02),
Name = "Tax Year"
};
var taxCalculationResult = new OperationResult <decimal>
{
Response = expectedTaxAmount
};
_clock.Setup(c => c.GetCurrentDateTime()).Returns(expectedCreationDate);
_validationRuleEngine.Setup(s => s.Validate(It.IsAny <TaxCalculationRequest>()))
.Returns(new OperationResult <TaxCalculationResponse>());
_calculationMappingRepository.Setup(f => f.GetByPostalCodeAsync(It.IsAny <string>()))
.ReturnsAsync(new PostalCodeCalculationTypeMapping {
CalculationType = expectedCalculationType
});
_taxCalculatorFactory.Setup(f => f.GetCalculator(It.IsAny <TaxCalculationType>()))
.Returns(_taxCalculator.Object);
_taxYearRepository.Setup(t => t.GetTaxYearAsync(It.IsAny <DateTime>()))
.ReturnsAsync(taxYear);
_taxCalculator.Setup(t => t.CalculateTaxAsync(It.IsAny <TaxYear>(), It.IsAny <decimal>()))
.ReturnsAsync(taxCalculationResult);
_calculationRepository.Setup(r => r.AddAsync(It.IsAny <TaxCalculation>()))
.Callback((TaxCalculation c) => savedRecord = c);
//Act
var operationResult = await _calculatorManager.CalculateTax(calculationRequest);
//Assert
Assert.IsNotNull(operationResult?.Response);
Assert.IsFalse(operationResult.HasErrors);
_calculationRepository.Verify(r => r.AddAsync(It.IsAny <TaxCalculation>()), Times.Once);
Assert.IsNotNull(savedRecord);
Assert.AreEqual(expectedAnnualIncome, savedRecord.AnnualIncome);
Assert.AreEqual(expectedTaxAmount, savedRecord.TaxAmount);
Assert.AreEqual(expectedCalculationType, savedRecord.CalculationType);
Assert.AreEqual(expectedRequestedBy, savedRecord.CreatedBy);
Assert.AreEqual(expectedCreationDate, savedRecord.CreationDate);
Assert.AreEqual(expectedPostalCode, savedRecord.PostalCode);
Assert.AreEqual(taxYear, savedRecord.TaxYear);
}
public async Task CalculateTax_Should_Successfully_Calculate_Tax()
{
//Arrange
const string postalCode = "12234";
const decimal incomeAmount = 23000M;
var requestDate = new DateTime(2020, 12, 15);
var calculationRequest = new TaxCalculationRequest()
{
AnnualIncome = incomeAmount,
PostalCode = postalCode
};
const int expectedTaxAmount = 100;
const TaxCalculationType expectedCalculationType = TaxCalculationType.PROGRESSIVE_TAX;
const string expectedTaxYear = "Tax Year (01-Jan-2020 - 02-Jan-2021)";
var taxYear = new TaxYear
{
FromDate = new DateTime(2020, 01, 01),
ToDate = new DateTime(2021, 01, 02),
Name = "Tax Year"
};
var taxCalculationResult = new OperationResult <decimal>
{
Response = expectedTaxAmount
};
_clock.Setup(c => c.GetCurrentDateTime()).Returns(requestDate);
_validationRuleEngine.Setup(s => s.Validate(It.IsAny <TaxCalculationRequest>()))
.Returns(new OperationResult <TaxCalculationResponse>());
_calculationMappingRepository.Setup(f => f.GetByPostalCodeAsync(It.IsAny <string>()))
.ReturnsAsync(new PostalCodeCalculationTypeMapping {
CalculationType = expectedCalculationType
});
_taxCalculatorFactory.Setup(f => f.GetCalculator(It.IsAny <TaxCalculationType>()))
.Returns(_taxCalculator.Object);
_taxYearRepository.Setup(t => t.GetTaxYearAsync(It.IsAny <DateTime>()))
.ReturnsAsync(taxYear);
_taxCalculator.Setup(t => t.CalculateTaxAsync(It.IsAny <TaxYear>(), It.IsAny <decimal>()))
.ReturnsAsync(taxCalculationResult);
//Act
var operationResult = await _calculatorManager.CalculateTax(calculationRequest);
//Assert
Assert.IsNotNull(operationResult?.Response);
Assert.IsFalse(operationResult.HasErrors);
_validationRuleEngine.Verify(s => s.Validate(calculationRequest), Times.Once);
_calculationMappingRepository.Verify(f => f.GetByPostalCodeAsync(postalCode),
Times.Once);
_taxCalculatorFactory.Verify(f => f.GetCalculator(expectedCalculationType), Times.Once);
_taxYearRepository.Verify(t => t.GetTaxYearAsync(requestDate), Times.Once);
_taxCalculator.Verify(t => t.CalculateTaxAsync(taxYear, incomeAmount), Times.Once());
Assert.AreEqual(expectedTaxAmount, operationResult.Response.TaxAmount);
Assert.AreEqual(expectedCalculationType, operationResult.Response.CalculationType);
Assert.AreEqual(expectedTaxYear, operationResult.Response.TaxYear);
}