public void CanGenerateSchedule_MonthlyPaymentsShouldBeCorrect()
{
var sut = new FixedMonthlyRateCalculationStrategy();
var parameters = new LoanCalculationParameters
{
Principal = 100000,
AnnualInterestRate = 0.06D,
PaybackTimeInYears = 10
};
var ret = sut.GetPayments(parameters);
ExpectMonthlyPayment(new Payment
{
Interest = 500,
Principal = 610.21D,
Balance = 99389.79D
}, ret[0]);
ExpectMonthlyPayment(new Payment
{
Interest = 471.99D,
Principal = 638.22D,
Balance = 93758.81D
}, ret[9]);
ExpectMonthlyPayment(new Payment
{
Interest = 5.52D,
Principal = 1104.68D,
Balance = 0
}, ret[119]);
}
private void CanGetMonthlyPaymentTest(LoanCalculationParameters parameters, double expected)
{
var sut = new FixedMonthlyRateCalculationStrategy();
var ret = sut.GetMonthlyPayment(parameters);
Assert.AreEqual(expected, Math.Round(ret, MagicNumbers.DecimalPonitPrecision));
}
public void CanGenerateSchedule_ShouldGenerateProperNumberOfPayments()
{
var sut = new FixedMonthlyRateCalculationStrategy();
var parameters = new LoanCalculationParameters
{
Principal = 100000,
AnnualInterestRate = 0.06D,
PaybackTimeInYears = 10
};
var ret = sut.GetPayments(parameters);
Assert.AreEqual(120, ret.Count);
}
public PaymentSchedule GetPaymentSchedule(LoanType loanType, int duration, double principal)
{
Validate(duration, principal);
var factory = new LoanFactory();
var loan = factory.GetLoan(loanType);
var calculationStrategy = new FixedMonthlyRateCalculationStrategy();
var loanCalulator = new LoanCalculator(calculationStrategy);
return(loanCalulator.GetPaymentSchedule(new LoanCalculationParameters()
{
AnnualInterestRate = loan.InterestRate,
PaybackTimeInYears = duration,
Principal = principal
}));
}
