public void OnGet()
{
if (!ModelState.IsValid)
{
return;
}
var input = new LoanCalculatorInput(Amount, TermYears * 12, InterestRate);
CalculationResult <decimal> result = null;
try
{
result = _loanCalculator.Calculate(input);
}
catch (ArgumentNullException)
{
OutputMessage = _localizer[LocalizationResourceKeys.LoanCalculatorErrorMessage];
}
if (result != null && result.Successful)
{
OutputMessage = string.Format(_localizer[LocalizationResourceKeys.LoanCalculatorResultMessage], Amount, TermYears, result.Value);
}
}
public void Calculate_NegativeInterestRate_FailsWithInvalidInputReason()
{
var input = new LoanCalculatorInput(100m, 12, -0.1m);
CalculationResult <decimal> result = _calculator.Calculate(input);
Assert.That(() => result.Successful, Is.False);
Assert.That(() => result.FailureReason, Is.EqualTo(CalculationFailureReason.InvalidInput));
}
public void Calculate_ZeroInterestRate_ResultContainsCorrectValue()
{
var input = new LoanCalculatorInput(100m, 12, 0m);
CalculationResult <decimal> result = _calculator.Calculate(input);
Assert.That(() => result.Successful, Is.True);
Assert.That(() => result.Value, Is.EqualTo(8.33m));
}
public void Calculate_ZeroAmount_ResultContainsZero()
{
var input = new LoanCalculatorInput(0, 12, 0.1m);
CalculationResult <decimal> result = _calculator.Calculate(input);
Assert.That(() => result.Successful, Is.True);
Assert.That(() => result.Value, Is.EqualTo(0));
}
