public ActionResult Get([FromQuery] CalculateInterestInput input)
{
var result = _calculateInterestService.Calculate(input);
_logger.Log($"Result calculated: {result}", LogEvent.Debug);
return(Ok(result));
}
/// <summary>
/// Calculate the specified input and rate.
/// </summary>
/// <returns>The calculate.</returns>
/// <param name="input">Input.</param>
/// <param name="rate">Rate.</param>
public decimal Calculate(CalculateInterestInput input, decimal rate)
{
var initialValue = Convert.ToDouble(input.ValorInicial);
var interestRate = Convert.ToDouble(rate);
var interestRateCalculed = Math.Pow(1 + interestRate, input.Meses);
var result = initialValue * interestRateCalculed;
var resultWithTruncate = Convert.ToDecimal(Math.Truncate(100 * result) / 100);
return(resultWithTruncate);
}
public void ShouldCalculateInterestController(decimal valorInicial, int meses, decimal result)
{
var input = new CalculateInterestInput
{
ValorInicial = valorInicial,
Meses = meses
};
var actual = Assert.IsType <OkObjectResult>(_calculateInterestController.Get(input));
var expected = result;
Assert.Equal(expected, actual.Value);
}
public void ShouldCalculateZeroWhenInitialValueAndMonthIsZero()
{
var calculateInterestInput = new CalculateInterestInput
{
ValorInicial = 0,
Meses = 0
};
var actual = _calculateInterestService.Calculate(calculateInterestInput);
var expected = 0m;
Assert.Equal(expected, actual);
}
public void ShouldCalculateInterestValuesWithoutInterestRateSetInOptions(decimal valorInicial, int meses, decimal interestRate, decimal result)
{
var input = new CalculateInterestInput
{
ValorInicial = valorInicial,
Meses = meses
};
var actual = _calculateInterestService.Calculate(input, interestRate);
var expected = result;
Assert.Equal(expected, actual);
}
public void ShouldCalculateInterestValueFromExample()
{
var calculateInterestInput = new CalculateInterestInput
{
ValorInicial = 100,
Meses = 5
};
var actual = _calculateInterestService.Calculate(calculateInterestInput);
var expected = 105.10m;
Assert.Equal(expected, actual);
}
public void ShouldCalculateWhenInterestRateIsZero()
{
var interestRate = 0m;
var calculateInterestInput = new CalculateInterestInput
{
ValorInicial = 100,
Meses = 5
};
var actual = _calculateInterestService.Calculate(calculateInterestInput, interestRate);
var expected = 100m;
Assert.Equal(expected, actual);
}
/// <summary>
/// Calculate the specified input.
/// </summary>
/// <returns>The calculate.</returns>
/// <param name="input">Input.</param>
public decimal Calculate(CalculateInterestInput input)
{
return(Calculate(input, _options.InterestRate));
}
