public decimal CalculateCredit(Customer customer)
{
var creditScoreCalculator = new CreditScoreCalculator(customer.BureauScore);
var missedPaymentsCalculator = new MissedPaymentsCalculator(customer.MissedPaymentCount);
var completedPaymentsCalculator = new CompletedPaymentsCalculator(customer.CompletedPaymentCount);
if (creditScoreCalculator.CreditScoreBand == CreditScoreBands.Ineligible)
{
throw new InvalidCreditScoreException("Customer's credit score is too low.");
}
var maximumPoints = creditScoreCalculator.GetScore() + missedPaymentsCalculator.GetScore() + completedPaymentsCalculator.GetScore();
var ageAdjustedPoints = ApplyAgePointsCeiling(maximumPoints, customer.AgeInYears);
return(CalculateAvailableCreditFromPoints(ageAdjustedPoints));
}
public void GetScore_High()
{
var calculator = new MissedPaymentsCalculator(5);
Assert.Equal(-6, calculator.GetScore());
}
public void GetScore_Low()
{
var calculator = new MissedPaymentsCalculator(1);
Assert.Equal(-1, calculator.GetScore());
}
public void GetScore_Medium()
{
var calculator = new MissedPaymentsCalculator(2);
Assert.Equal(-3, calculator.GetScore());
}
public void GetScore_Zero()
{
var calculator = new MissedPaymentsCalculator(0);
Assert.Equal(0, calculator.GetScore());
}