public string CalculateCompoundInterestStringValue(string initialValue, double interestRate, int months)
{
var validateInterestRate = CheckIfInterestRateHasNegativeValue(interestRate);
if (!string.IsNullOrEmpty(validateInterestRate))
{
return(validateInterestRate);
}
var validateParameters = new ValidateStringParameter();
var validationStringParameterResult = validateParameters.Validate(initialValue, months);
if (!string.IsNullOrEmpty(validationStringParameterResult))
{
return(validationStringParameterResult);
}
var validDecimalParameter = validateParameters.ValidateDecimal(initialValue);
if (!string.IsNullOrEmpty(validDecimalParameter))
{
return(validDecimalParameter);
}
initialValue = initialValue.Replace(".", ",");
var initialValueUsed = decimal.Parse(initialValue, CultureInfo.GetCultureInfo("pt-BR"));
return((Math.Truncate(100 * (initialValueUsed * (decimal)Math.Pow((1 + interestRate), (double)months))) / 100).ToString("#0.00"));;
}
public void ValidateStringParameters_ShoulReturnErroWhenInitialValueIsNotNumber(string initialValue)
{
ValidateStringParameter validateStringParameters = new ValidateStringParameter();
var result = validateStringParameters.ValidateDecimal(initialValue);
Assert.Equal("[ERRO] O Valor inicial informado está em formato inválido.", result);
}
public void ValidateStringParameters_ShoulReturnErroWhenInitialValueHasMoreThanOneDot(string initialValue)
{
ValidateStringParameter validateStringParameters = new ValidateStringParameter();
int months = 1;
var result = validateStringParameters.Validate(initialValue, months);
Assert.Equal("[ERRO] O Valor inicial informado está em formato inválido.", result);
}
public void ValidateStringParameters_ShoulReturnErroWhenInitialValueAndMonthsAreValid(string initialValue)
{
ValidateStringParameter validateStringParameters = new ValidateStringParameter();
int months = 1;
var result = validateStringParameters.Validate(initialValue, months);
Assert.Equal(string.Empty, result);
}
public void ValidateStringParameters_ShoulNotReturnErroWhenInitialValueIsValidDecimal()
{
ValidateStringParameter validateStringParameters = new ValidateStringParameter();
string initialValue = "0.01";
var result = validateStringParameters.ValidateDecimal(initialValue);
Assert.Equal(string.Empty, result);
}
public void ValidateStringParameters_ShoulReturnErroWhenInitialValueIsZero()
{
ValidateStringParameter validateStringParameters = new ValidateStringParameter();
string initialValue = "0.00";
var result = validateStringParameters.ValidateDecimal(initialValue);
Assert.Equal("[ERRO] O Valor inicial informado deve ser um número decimal maior que zero (0).", result);
}
public void ValidateStringParameters_ShoulReturnErroWhenMonthsIsZero(string initialValue)
{
ValidateStringParameter validateStringParameters = new ValidateStringParameter();
int months = 0;
var result = validateStringParameters.Validate(initialValue, months);
Assert.Equal("[ERRO] O Valor informado no parâmetro 'meses' deve ser um número inteiro maior que zero (0).", result);
}
