1 /* 2 * Copyright (C) 2009 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.collect; 18 19 import static com.google.common.truth.Truth.assertThat; 20 21 import com.google.common.annotations.GwtCompatible; 22 import junit.framework.AssertionFailedError; 23 import junit.framework.TestCase; 24 25 /** 26 * Unit test for {@link ComparisonChain}. 27 * 28 * @author Kevin Bourrillion 29 */ 30 @GwtCompatible 31 public class ComparisonChainTest extends TestCase { 32 private static final DontCompareMe DONT_COMPARE_ME = new DontCompareMe(); 33 34 private static class DontCompareMe implements Comparable<DontCompareMe> { 35 @Override compareTo(DontCompareMe o)36 public int compareTo(DontCompareMe o) { 37 throw new AssertionFailedError(); 38 } 39 } 40 41 @SuppressWarnings("deprecation") testCompareBooleans()42 public void testCompareBooleans() { 43 assertThat( 44 ComparisonChain.start() 45 .compare(true, true) 46 .compare(true, Boolean.TRUE) 47 .compare(Boolean.TRUE, true) 48 .compare(Boolean.TRUE, Boolean.TRUE) 49 .result()) 50 .isEqualTo(0); 51 } 52 testDegenerate()53 public void testDegenerate() { 54 // kinda bogus, but who cares? 55 assertThat(ComparisonChain.start().result()).isEqualTo(0); 56 } 57 testOneEqual()58 public void testOneEqual() { 59 assertThat(ComparisonChain.start().compare("a", "a").result()).isEqualTo(0); 60 } 61 testOneEqualUsingComparator()62 public void testOneEqualUsingComparator() { 63 assertThat(ComparisonChain.start().compare("a", "A", String.CASE_INSENSITIVE_ORDER).result()) 64 .isEqualTo(0); 65 } 66 testManyEqual()67 public void testManyEqual() { 68 assertThat( 69 ComparisonChain.start() 70 .compare(1, 1) 71 .compare(1L, 1L) 72 .compareFalseFirst(true, true) 73 .compare(1.0, 1.0) 74 .compare(1.0f, 1.0f) 75 .compare("a", "a", Ordering.usingToString()) 76 .result()) 77 .isEqualTo(0); 78 } 79 testShortCircuitLess()80 public void testShortCircuitLess() { 81 assertThat( 82 ComparisonChain.start() 83 .compare("a", "b") 84 .compare(DONT_COMPARE_ME, DONT_COMPARE_ME) 85 .result()) 86 .isLessThan(0); 87 } 88 testShortCircuitGreater()89 public void testShortCircuitGreater() { 90 assertThat( 91 ComparisonChain.start() 92 .compare("b", "a") 93 .compare(DONT_COMPARE_ME, DONT_COMPARE_ME) 94 .result()) 95 .isGreaterThan(0); 96 } 97 testShortCircuitSecondStep()98 public void testShortCircuitSecondStep() { 99 assertThat( 100 ComparisonChain.start() 101 .compare("a", "a") 102 .compare("a", "b") 103 .compare(DONT_COMPARE_ME, DONT_COMPARE_ME) 104 .result()) 105 .isLessThan(0); 106 } 107 testCompareFalseFirst()108 public void testCompareFalseFirst() { 109 assertThat(ComparisonChain.start().compareFalseFirst(true, true).result()).isEqualTo(0); 110 assertThat(ComparisonChain.start().compareFalseFirst(true, false).result()).isGreaterThan(0); 111 assertThat(ComparisonChain.start().compareFalseFirst(false, true).result()).isLessThan(0); 112 assertThat(ComparisonChain.start().compareFalseFirst(false, false).result()).isEqualTo(0); 113 } 114 testCompareTrueFirst()115 public void testCompareTrueFirst() { 116 assertThat(ComparisonChain.start().compareTrueFirst(true, true).result()).isEqualTo(0); 117 assertThat(ComparisonChain.start().compareTrueFirst(true, false).result()).isLessThan(0); 118 assertThat(ComparisonChain.start().compareTrueFirst(false, true).result()).isGreaterThan(0); 119 assertThat(ComparisonChain.start().compareTrueFirst(false, false).result()).isEqualTo(0); 120 } 121 } 122