@Test
public void testGetPaymentsAmortizedWithOverPayment() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
amAttrs.setLoanAmount(ofUSD(10000));
amAttrs.setInterestRateAsPercent(3.);
amAttrs.setInterestOnly(false);
amAttrs.setRegularPayment(ofUSD(400));
amAttrs.setPaymentFrequency(TimePeriod.SemiMonthly.getPeriodsPerYear());
int termInMonths = 24;
amAttrs.setTermInMonths(termInMonths);
amAttrs.setAmortizationPeriodInMonths(24);
amAttrs.setCompoundingPeriodsPerYear(2);
List<ScheduledPayment> schedule = AmortizationCalculator.generateSchedule(amAttrs);
assertEquals(
"Amortized payment count",
amAttrs.getPaymentFrequency() * termInMonths / 12,
schedule.size());
MonetaryAmount interestTotal =
schedule.stream().map(payment -> payment.getInterest()).reduce((a, b) -> a.add(b)).get();
assertEquals("Amortized Interest total", ofUSD(164.81), interestTotal);
}
@Test
public void testGenerateScheduleInterestOnlyArrayBounds() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
amAttrs.setLoanAmount(ofUSD(10000));
amAttrs.setInterestRateAsPercent(12.);
amAttrs.setInterestOnly(true);
amAttrs.setPaymentFrequency(TimePeriod.Weekly.getPeriodsPerYear());
int termInMonths = 24;
amAttrs.setTermInMonths(termInMonths);
amAttrs.setAdjustmentDate(LocalDate.of(2016, Month.JANUARY, 1));
List<ScheduledPayment> schedule = AmortizationCalculator.generateSchedule(amAttrs);
try {
schedule.get(-1);
fail("Interest only schedule should not allow negative payment number");
} catch (IndexOutOfBoundsException iobe) {
}
int expectedPayments =
(int) Math.ceil(amAttrs.getPaymentFrequency() * amAttrs.getTermInMonths() / 12.);
try {
schedule.get(expectedPayments);
fail("Interest only schedule should not allow payments beyond schedule bound");
} catch (IndexOutOfBoundsException iobe) {
}
schedule.get(expectedPayments - 1);
}