| /* |
| * Copyright 2017 The Mifos Initiative. |
| * |
| * 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. |
| */ |
| package io.mifos.individuallending.internal.service; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.junit.runners.Parameterized; |
| |
| import java.math.BigDecimal; |
| import java.util.*; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| /** |
| * @author Myrle Krantz |
| */ |
| @RunWith(Parameterized.class) |
| public class RateCollectorsTest { |
| final static private BigDecimal pointOne = BigDecimal.valueOf(0.1); |
| private static class TestCase { |
| private final String description; |
| private Collection<BigDecimal> values; |
| private BigDecimal expectedCompound; |
| private BigDecimal expectedGeometricMean; |
| private int significantDigits; |
| |
| TestCase(final String description) { |
| this.description = description; |
| } |
| |
| TestCase values(final Collection<BigDecimal> newVal) { |
| values = newVal; |
| return this; |
| } |
| |
| TestCase compound(final BigDecimal newVal) { |
| expectedCompound = newVal; |
| return this; |
| } |
| |
| TestCase geometricMean(final BigDecimal newVal) { |
| expectedGeometricMean = newVal; |
| return this; |
| } |
| |
| TestCase significantDigits(final int newVal) { |
| significantDigits = newVal; |
| return this; |
| } |
| |
| @Override |
| public String toString() { |
| return "TestCase{" + |
| "description='" + description + '\'' + |
| '}'; |
| } |
| } |
| |
| @Parameterized.Parameters |
| public static Collection testCases() { |
| final Collection<TestCase> ret = new ArrayList<>(); |
| ret.add(baseCase()); |
| ret.add(lotsaPointOnesCase()); |
| ret.add(slightlyMoreComplexCase()); |
| return ret; |
| } |
| |
| private static TestCase baseCase() { |
| return new TestCase("baseCase") |
| .values(Collections.singletonList(pointOne)) |
| .significantDigits(1) |
| .compound(pointOne) |
| .geometricMean(pointOne); |
| } |
| |
| private static TestCase lotsaPointOnesCase() { |
| return new TestCase("lotsaPointOnesCase") |
| .values(Stream |
| .iterate(pointOne, x -> pointOne) |
| .limit(10).collect(Collectors.toList())) |
| .significantDigits(3) |
| .compound(BigDecimal.valueOf(1.594)) |
| .geometricMean(pointOne.setScale(3, BigDecimal.ROUND_HALF_EVEN)); |
| } |
| |
| private static TestCase slightlyMoreComplexCase() { |
| return new TestCase("slightlyMoreComplexCase") |
| .values(Arrays.asList(BigDecimal.valueOf(0.2), BigDecimal.valueOf(0.06), BigDecimal.valueOf(0.01))) |
| .significantDigits(4) |
| .compound(BigDecimal.valueOf(0.2847)) |
| .geometricMean(BigDecimal.valueOf(0.0871)); |
| } |
| |
| private final TestCase testCase; |
| |
| public RateCollectorsTest(final TestCase testCase) |
| { |
| this.testCase = testCase; |
| } |
| |
| |
| @Test |
| public void geometricMean() throws Exception { |
| Assert.assertEquals(testCase.expectedGeometricMean, testCase.values.stream().collect(RateCollectors.geometricMean(testCase.significantDigits))); |
| } |
| |
| |
| @Test |
| public void compound() |
| { |
| Assert.assertEquals(testCase.expectedCompound, testCase.values.stream().collect(RateCollectors.compound(testCase.significantDigits))); |
| } |
| |
| @Test |
| public void compoundAndGeometricMeanCompatible() |
| { |
| final BigDecimal geometricMean = testCase.values.stream() |
| .collect(RateCollectors.geometricMean(testCase.significantDigits)); |
| |
| final BigDecimal compoundingOfGeometricMean = Stream |
| .iterate(geometricMean, x -> geometricMean) |
| .limit(testCase.values.size()) |
| .collect(RateCollectors.compound(testCase.significantDigits)); |
| |
| Assert.assertEquals(testCase.expectedCompound, compoundingOfGeometricMean); |
| } |
| |
| @Test |
| public void compoundViaParalletStream() |
| { |
| Assert.assertEquals(testCase.expectedCompound, testCase.values.parallelStream().collect(RateCollectors.compound(testCase.significantDigits))); |
| } |
| |
| @Test |
| public void geometricMeanViaParalletStream() |
| { |
| Assert.assertEquals(testCase.expectedGeometricMean, testCase.values.parallelStream().collect(RateCollectors.geometricMean(testCase.significantDigits))); |
| } |
| } |