public IActionResult OnPost()
{
dto.CashFlows = new List <CashFlowDTO>();
for (int i = 0; i < Request.Form["y.Id"].Count; i++)
{
dto.CashFlows.Add(new CashFlowDTO
{
Id = Convert.ToInt32(Request.Form["y.Id"][i]),
Amount = string.IsNullOrEmpty(Request.Form["y.Amount"][i]) ? 0 : Convert.ToDouble(Request.Form["y.Amount"][i])
});
}
NpvValidate validate = new NpvValidate();
NpvCalculator calc = new NpvCalculator(validate);
dto = calc.Compute(dto);
if (ModelState.IsValid)
{
var npv = mapper.Map <Npv>(dto);
npvData.Update(npv);
return(RedirectToPage("./Detail", new { npvId = dto.NpvId }));
}
else
{
ModelState.AddModelError("error", "An error occured");
}
return(Page());
}
public void MoreThan20ResultShouldOnlyReturn20Records(
double[] expectedNpvResult, decimal lowerDiscount, decimal upperDiscount,
decimal increment, decimal outflow, double[] inflows)
{
var sut = new NpvCalculator();
//Validation has been tested on project NpvApi.Dtos.Test so will not test again here.
var npvOptions = new NpvOptions
{
RateOption = new RateOption
{
LowerDiscount = lowerDiscount,
UpperDiscount = upperDiscount,
DiscountIncrement = increment
},
Outflow = outflow
};
foreach (var inflow in inflows.ToList())
{
npvOptions.Inflows.Add(new Inflow()
{
Value = (decimal)inflow
});
}
var result = sut.Calculate(npvOptions);
Assert.Equal(20, result.Count);
}
public void Should_Not_Accept_Lower_Rate_Higher_Than_Upper_Rate()
{
var dto = new NpvDTO
{
Name = "Cashflow 1",
IncrementRate = 25,
LowerRate = 2,
UpperRate = 1,
InitialValue = 10000,
TotalNpvAmount = null,
CashFlows = new List <CashFlowDTO> {
new CashFlowDTO {
Amount = 1000
},
new CashFlowDTO {
Amount = 2000
}
}
};
Mock <INpvValidate> mockValidator = new Mock <INpvValidate>();
mockValidator.Setup(x => x.Validate(It.Is <NpvDTO>(n => n.LowerRate > n.UpperRate))).Throws <Exception>();
var sut = new NpvCalculator(mockValidator.Object);
Assert.Throws <Exception>(() => sut.Compute(dto));
}
public void Compute_NPV()
{
var dto = new NpvDTO
{
Name = "Cashflow 1",
IncrementRate = 25,
LowerRate = 1,
UpperRate = 2,
InitialValue = 10000,
TotalNpvAmount = null,
CashFlows = new List <CashFlowDTO> {
new CashFlowDTO {
Amount = 1000
},
new CashFlowDTO {
Amount = 2000
}
}
};
Mock <INpvValidate> mockValidator = new Mock <INpvValidate>();
mockValidator.Setup(x => x.Validate(It.IsAny <NpvDTO>())).Returns(true);
var sut = new NpvCalculator(mockValidator.Object);
var n = sut.Compute(dto);
Assert.Equal("-7750.14", String.Format("{0:0.##}", n.TotalNpvAmount));
}
public void CalculateCashFlows_Should_be_passed_when_testing_npv_amount_for_given_inputs()
{
// Arrange
INpvCalculator calculator = new NpvCalculator();
NpvInput input = new NpvInput();
input.Cash = 100m;
input.CashSeries = 10m;
input.IncrementDiscountRate = 0.0025m;
input.LowerDiscountRateBound = 0.01m;
input.UpperDiscountRateBound = 0.15m;
// Act
var npvCashFlows = calculator.CalculateCashFlows(input);
// Assert
var npvCashFlow = npvCashFlows.Where(c => c.Rate == 0.01m).SingleOrDefault <NpvCashFlow>();
var npvCashFlow2 = npvCashFlows.Where(c => c.Rate == 0.1m).SingleOrDefault <NpvCashFlow>();
var npvCashFlow3 = npvCashFlows.Where(c => c.Rate == 0.15m).SingleOrDefault <NpvCashFlow>();
Assert.IsTrue(npvCashFlows.Count() > 0);
Assert.IsTrue(Math.Round(npvCashFlow.Amount, 2) == 947.13m);
Assert.IsTrue(Math.Round(npvCashFlow2.Amount, 2) == 614.46m);
Assert.IsTrue(Math.Round(npvCashFlow3.Amount, 2) == 501.88m);
}
public void Should_Not_Accept_If_Empty_Cashflow()
{
var dto = new NpvDTO
{
Name = "Cashflow 1",
IncrementRate = 25,
LowerRate = 2,
UpperRate = 1,
InitialValue = 10000,
TotalNpvAmount = null,
CashFlows = null
};
Mock <INpvValidate> mockValidator = new Mock <INpvValidate>();
mockValidator.Setup(x => x.Validate(It.Is <NpvDTO>(n => n.CashFlows == null))).Throws <Exception>();
var sut = new NpvCalculator(mockValidator.Object);
Assert.Throws <Exception>(() => sut.Compute(dto));
}
public IActionResult OnGet()
{
try
{
dto = TempData.Get <NpvDTO>("npvDTO");
if (dto == null)
{
return(RedirectToPage("./NotFound"));
}
NpvValidate validate = new NpvValidate();
NpvCalculator calc = new NpvCalculator(validate);
dto = calc.Compute(dto);
return(Page());
}
catch (Exception e)
{
return(RedirectToPage("./Error"));
}
}
public void ValidInputShouldGetCorrectNpvResults(double[] expectedNpvResult,
decimal lowerDiscount, decimal upperDiscount, decimal increment, decimal outflow,
double[] inflows)
{
var sut = new NpvCalculator();
//Validation testing has been done on project NpvApi.Dtos.Test so will not test again here.
var npvOptions = new NpvOptions
{
RateOption = new RateOption
{
LowerDiscount = lowerDiscount,
UpperDiscount = upperDiscount,
DiscountIncrement = increment
},
Outflow = outflow
};
foreach (var inflow in inflows.ToList())
{
npvOptions.Inflows.Add(new Inflow()
{
Value = (decimal)inflow
});
}
var result = sut.Calculate(npvOptions);
Assert.Equal(expectedNpvResult.Length, result.Count);
for (int i = 0; i < expectedNpvResult.Length; i++)
{
var expected = expectedNpvResult[i];
var actual = (double)result[i].NetPresentValue;
Assert.Equal(expected, actual);
}
}
public void RateIncrement0ShouldOnlyReturn1ResultBack(
double[] expectedNpvResult, decimal lowerDiscount, decimal upperDiscount,
decimal increment, decimal outflow, double[] inflows)
{
//This case need to check the result set which is different than the previous one\
//so just keep it seperate.
var sut = new NpvCalculator();
var npvOptions = new NpvOptions
{
RateOption = new RateOption
{
LowerDiscount = lowerDiscount,
UpperDiscount = upperDiscount,
DiscountIncrement = increment
},
Outflow = outflow
};
foreach (var inflow in inflows.ToList())
{
npvOptions.Inflows.Add(new Inflow()
{
Value = (decimal)inflow
});
}
var result = sut.Calculate(npvOptions);
Assert.Equal(1, result.Count);
var expected = expectedNpvResult.First();
var actual = (double)result.First().NetPresentValue;
Assert.Equal(expected, actual);
}