@Test public void testGetActualPaymentWithNullRegularPayment() { AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate(); amAttrs.setRegularPayment(null); MonetaryAmount periodicPayment = AmortizationCalculator.getPeriodicPayment(amAttrs); assertNotNull("Regular payment computed when initialized as null", periodicPayment); }
@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 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 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()); } }
private AmortizationAttributes generateAmortizationAttributesObjectTemplate() { AmortizationAttributes amAttrs = new AmortizationAttributes(); amAttrs.setLoanAmount(USD50000); amAttrs.setRegularPayment(USD50000.divide(100)); amAttrs.setStartDate(LocalDate.of(2015, Month.DECEMBER, 28)); amAttrs.setAdjustmentDate(LocalDate.of(2016, Month.JANUARY, 1)); amAttrs.setTermInMonths(24); amAttrs.setInterestOnly(false); amAttrs.setAmortizationPeriodInMonths(300); amAttrs.setCompoundingPeriodsPerYear(2); amAttrs.setPaymentFrequency(12); amAttrs.setInterestRateAsPercent(12.); return amAttrs; }