@Test
public void testGetPaymentsAmortizedFully() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
MonetaryAmount loanAmount = ofUSD(10000);
amAttrs.setLoanAmount(loanAmount);
amAttrs.setInterestRateAsPercent(7.);
amAttrs.setInterestOnly(false);
amAttrs.setPaymentFrequency(TimePeriod.Monthly.getPeriodsPerYear());
int termInMonths = 12;
amAttrs.setTermInMonths(termInMonths);
amAttrs.setAmortizationPeriodInMonths(12);
amAttrs.setCompoundingPeriodsPerYear(2);
amAttrs.setRegularPayment(AmortizationCalculator.getPeriodicPayment(amAttrs));
List<ScheduledPayment> schedule = AmortizationCalculator.generateSchedule(amAttrs);
MonetaryAmount interestTotal =
schedule.stream().map(payment -> payment.getInterest()).reduce((a, b) -> a.add(b)).get();
assertEquals("Amortized Interest total", ofUSD(377.67), interestTotal);
MonetaryAmount principalTotal =
schedule.stream().map(payment -> payment.getPrincipal()).reduce((a, b) -> a.add(b)).get();
assertEquals("Amortized Principal fully paid", loanAmount, principalTotal);
}
@Test
public void testGenerateScheduleInterestOnlyMonthly() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
amAttrs.setLoanAmount(ofUSD(10000));
amAttrs.setInterestRateAsPercent(10.);
amAttrs.setInterestOnly(true);
amAttrs.setPaymentFrequency(TimePeriod.Monthly.getPeriodsPerYear());
int termInMonths = 12;
amAttrs.setTermInMonths(termInMonths);
amAttrs.setAdjustmentDate(LocalDate.of(2016, Month.JANUARY, 1));
amAttrs.setRegularPayment(ofUSD(0));
List<ScheduledPayment> schedule = AmortizationCalculator.generateSchedule(amAttrs);
assertEquals("Interest only schedule term in months", termInMonths, schedule.size());
MonetaryAmount expectedInterest = ofUSD(83.34);
MonetaryAmount expectedPrincipal = ofUSD(0);
LocalDate expectedDate = amAttrs.getAdjustmentDate();
int index = 0;
for (ScheduledPayment payment : schedule) {
expectedDate = expectedDate.plusMonths(1L);
assertEquals("Interest only schedule payment number", ++index, payment.getPaymentNumber());
assertEquals("Interest only schedule payment date", expectedDate, payment.getPaymentDate());
assertEquals(
"Interest only schedule payment interest", expectedInterest, payment.getInterest());
assertEquals(
"Interest only schedule payment principal", expectedPrincipal, payment.getPrincipal());
assertEquals(
"Interest only schedule payment total payment", expectedInterest, payment.getPayment());
assertEquals(
"Interest only schedule payment loan principal", ofUSD(10000), payment.getBalance());
}
}
@Test
public void testGetPeriodicPaymentCompoundSemiPaymentMonthly() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
amAttrs.setLoanAmount(USD50000.divide(5));
amAttrs.setInterestRateAsPercent(10.);
amAttrs.setCompoundingPeriodsPerYear(TimePeriod.SemiAnnually.getPeriodsPerYear());
amAttrs.setAmortizationPeriodInMonths(12);
amAttrs.setPaymentFrequency(TimePeriod.Monthly.getPeriodsPerYear());
MonetaryAmount result = AmortizationCalculator.getPeriodicPayment(amAttrs);
MonetaryAmount expectedResult = ofUSD(878.22);
assertEquals("Amortized, compounded semi-annual, payment monthly", expectedResult, result);
}
@Test
public void testGetPaymentsAmortized() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
amAttrs.setLoanAmount(ofUSD(200000));
amAttrs.setInterestRateAsPercent(8.);
amAttrs.setInterestOnly(false);
amAttrs.setPaymentFrequency(TimePeriod.Monthly.getPeriodsPerYear());
int termInMonths = 36;
amAttrs.setTermInMonths(termInMonths);
amAttrs.setAmortizationPeriodInMonths(20 * 12);
amAttrs.setCompoundingPeriodsPerYear(2);
amAttrs.setRegularPayment(AmortizationCalculator.getPeriodicPayment(amAttrs));
List<ScheduledPayment> schedule = AmortizationCalculator.generateSchedule(amAttrs);
assertEquals("Amortized payment count", termInMonths, schedule.size());
MonetaryAmount interestTotal =
schedule.stream().map(payment -> payment.getInterest()).reduce((a, b) -> a.add(b)).get();
assertEquals("Amortized Interest total", ofUSD(45681.29), interestTotal);
}
@Test
public void testPaymentDateMonthly() {
testPaymentDatesWithMonthlyIntervals(TimePeriod.Monthly.getPeriodsPerYear());
}
