public void throw_an_exception_if_algorithm_cannot_converge(
decimal principal,
decimal totalRepayment,
int monthlyPayments,
double lowerBoundInterestRate,
double upperBoundInterestRate)
{
var monthlyCompoundingInterest = new MonthlyCompoundingInterest();
Action action = () => monthlyCompoundingInterest.FindCompoundInterestRate(
new Money(principal), new Money(totalRepayment), monthlyPayments, new InterestRate(lowerBoundInterestRate), new InterestRate(upperBoundInterestRate));
action.ShouldThrow <CompoundInterestRateConvergenceException>();
}
public void get_loan_repayment_breakdown(
decimal principal,
double annualInterestRate,
int monthlyRepayments,
decimal expectedMonthlyRepayment)
{
var monthlyCompoundingInterest = new MonthlyCompoundingInterest();
var monthlyPayment = monthlyCompoundingInterest.GetMonthlyPayment(
new Money(principal), new InterestRate(annualInterestRate), monthlyRepayments
);
monthlyPayment.Amount.Should().BeApproximately(expectedMonthlyRepayment, DesiredAmountPrecision);
}
public void display_a_loan_quote_for_monthly_compunding_interests()
{
var quotePrinter = new QuotePrinter(console.Object);
var interestCalculation = new MonthlyCompoundingInterest();
var lenderMarket = new LenderMarket(interestCalculation);
var loanCalculator = new LoanCalculator(inputValidator.Object, quotePrinter, new CsvFileMarketDataSource(),
lenderMarket, interestCalculation);
loanCalculator.GetQuoteFor(MonthlyPayments, inputParameters);
console.Verify(a => a.WriteLine("Requested amount: �00"));
console.Verify(a => a.WriteLine("Rate: 7.0%"));
console.Verify(a => a.WriteLine("Monthly repayment: �.88"));
console.Verify(a => a.WriteLine("Total repayment: �11.64"));
}
public void calculate_interest_rate_from(
decimal principal,
decimal totalRepayment,
int monthlyPayments,
double lowerBoundInterestRate,
double upperBoundInterestRate,
double expectedInterestRate)
{
var monthlyCompoundingInterest = new MonthlyCompoundingInterest();
var rate = monthlyCompoundingInterest.FindCompoundInterestRate(
new Money(principal), new Money(totalRepayment), monthlyPayments, new InterestRate(lowerBoundInterestRate), new InterestRate(upperBoundInterestRate));
rate.Annual.Should().BeApproximately(expectedInterestRate, DesiredInterestRatePrecision);
}
