/*
* Copyright (c) 2005-2011 Grameen Foundation USA
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*
* See also http://www.apache.org/licenses/LICENSE-2.0.html for an
* explanation of the license and how it is applied.
*/
package org.mifos.clientportfolio.newloan.domain;
import static org.hamcrest.Matchers.is;
import static org.junit.Assert.assertThat;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mifos.accounts.productdefinition.util.helpers.GraceType;
import org.mifos.framework.util.helpers.Money;
import org.mockito.runners.MockitoJUnitRunner;
@RunWith(MockitoJUnitRunner.class)
public class DecliningBalanceLoanInterestCalculatorTest {
private DecliningBalanceLoanInterestCalculator decliningBalanceLoanInterestCalculator;
@Before
public void setup() {
decliningBalanceLoanInterestCalculator = new DecliningBalanceLoanInterestCalculator();
}
@Test
public void shouldCalculateLoanInterest() {
// setup
LoanInterestCalculationDetails loanInterestCalculationDetails = new LoanInterestCalculationDetailsBuilder().withLoanAmount("100.0")
.withInterestRate("10.0")
.withDurationInYears("1.0")
.withGraceType(GraceType.NONE)
.withGraceDurationOf(0)
.withNumberOfInstallments(6)
.withInterestFractionalRatePerInstallmentOf("0.16")
.build();
// exercise test
Money calculatedInterest = decliningBalanceLoanInterestCalculator.calculate(loanInterestCalculationDetails);
// verification
assertThat(moneyOf(calculatedInterest), is(moneyOf(TestMoneyUtil.createMoney("62.8"))));
}
@Test
public void shouldCalculateLoanInterestWithPrincipalOnlyGrace() {
// setup
LoanInterestCalculationDetails loanInterestCalculationDetails = new LoanInterestCalculationDetailsBuilder().withLoanAmount("100.0")
.withInterestRate("10.0")
.withDurationInYears("1.0")
.withGraceType(GraceType.PRINCIPALONLYGRACE)
.withGraceDurationOf(0)
.withNumberOfInstallments(6)
.withInterestFractionalRatePerInstallmentOf("0.16")
.build();
// exercise test
Money calculatedInterest = decliningBalanceLoanInterestCalculator.calculate(loanInterestCalculationDetails);
// verification
assertThat(moneyOf(calculatedInterest), is(moneyOf(TestMoneyUtil.createMoney("62.8"))));
}
@Test
public void shouldCalculateLoanInterestWithPrincipalOnlyGraceAndGraceDuration() {
// setup
LoanInterestCalculationDetails loanInterestCalculationDetails = new LoanInterestCalculationDetailsBuilder().withLoanAmount("100.0")
.withInterestRate("10.0")
.withDurationInYears("1.0")
.withGraceType(GraceType.PRINCIPALONLYGRACE)
.withGraceDurationOf(3)
.withNumberOfInstallments(6)
.withInterestFractionalRatePerInstallmentOf("0.16")
.build();
// exercise test
Money calculatedInterest = decliningBalanceLoanInterestCalculator.calculate(loanInterestCalculationDetails);
// verification
assertThat(moneyOf(calculatedInterest), is(moneyOf(TestMoneyUtil.createMoney("81.6"))));
}
@Test
public void shouldCalculateLoanInterestWithZeroInterest() {
// setup
LoanInterestCalculationDetails loanInterestCalculationDetails = new LoanInterestCalculationDetailsBuilder().withLoanAmount("100.0")
.withInterestRate("0.0")
.withDurationInYears("1.0")
.withGraceType(GraceType.PRINCIPALONLYGRACE)
.withGraceDurationOf(3)
.withNumberOfInstallments(6)
.withInterestFractionalRatePerInstallmentOf("0.16")
.build();
// exercise test
Money calculatedInterest = decliningBalanceLoanInterestCalculator.calculate(loanInterestCalculationDetails);
// verification
assertThat(moneyOf(calculatedInterest), is(moneyOf(TestMoneyUtil.createMoney("48.0"))));
}
private String moneyOf(Money money) {
return money.toString(Short.valueOf("1"));
}
}