@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()); } }