@Test
public void testGetPeriodInterest_InterestOnly() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
amAttrs.setLoanAmount(USD50000);
amAttrs.setPaymentFrequency(12);
amAttrs.setInterestRateAsPercent(11.);
amAttrs.setInterestOnly(true);
// MonetaryAmount expectedResult = Monetary.getDefaultAmountFactory()
// .setCurrency("USD")
// .setNumber(458.34)
// .create();
MonetaryAmount periodicPaymentResult = AmortizationCalculator.getPeriodicPayment(amAttrs);
MonetaryAmount periodInterestRestult = AmortizationCalculator.getPeriodInterest(amAttrs);
assertEquals(
"Monthly interest-only payment should match interest computed for period.",
periodicPaymentResult,
periodInterestRestult);
}
@Test
public void testGetPeriodInterest_Amortized() {
AmortizationAttributes amAttrs = generateAmortizationAttributesObjectTemplate();
amAttrs.setLoanAmount(USD50000.multiply(2));
amAttrs.setInterestRateAsPercent(12.);
amAttrs.setCompoundingPeriodsPerYear(2);
amAttrs.setPaymentFrequency(12);
List<ScheduledPayment> generatedSchedule = AmortizationCalculator.generateSchedule(amAttrs);
generatedSchedule
.stream()
.forEachOrdered(
p -> {
MonetaryAmount periodInterest = AmortizationCalculator.getPeriodInterest(amAttrs);
assertEquals(
"Monthly amortized payment interest matches peirod interest",
p.getInterest(),
periodInterest);
amAttrs.setLoanAmount(p.getBalance());
});
}