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 com.google.common.annotations.GwtCompatible; 20 21 import junit.framework.AssertionFailedError; 22 import junit.framework.TestCase; 23 24 /** 25 * Unit test for {@link ComparisonChain}. 26 * 27 * @author Kevin Bourrillion 28 */ 29 @GwtCompatible 30 public class ComparisonChainTest extends TestCase { 31 private static final DontCompareMe DONT_COMPARE_ME = new DontCompareMe(); 32 33 private static class DontCompareMe implements Comparable<DontCompareMe> { 34 @Override compareTo(DontCompareMe o)35 public int compareTo(DontCompareMe o) { 36 throw new AssertionFailedError(); 37 } 38 } 39 testDegenerate()40 public void testDegenerate() { 41 // kinda bogus, but who cares? 42 assertEquals(0, ComparisonChain.start().result()); 43 } 44 testOneEqual()45 public void testOneEqual() { 46 assertEquals(0, ComparisonChain.start() 47 .compare("a", "a") 48 .result()); 49 } 50 testOneEqualUsingComparator()51 public void testOneEqualUsingComparator() { 52 assertEquals(0, ComparisonChain.start() 53 .compare("a", "A", String.CASE_INSENSITIVE_ORDER) 54 .result()); 55 } 56 testManyEqual()57 public void testManyEqual() { 58 assertEquals(0, ComparisonChain.start() 59 .compare(1, 1) 60 .compare(1L, 1L) 61 .compareFalseFirst(true, true) 62 .compare(1.0, 1.0) 63 .compare(1.0f, 1.0f) 64 .compare("a", "a", Ordering.usingToString()) 65 .result()); 66 } 67 testShortCircuitLess()68 public void testShortCircuitLess() { 69 assertTrue(ComparisonChain.start() 70 .compare("a", "b") 71 .compare(DONT_COMPARE_ME, DONT_COMPARE_ME) 72 .result() < 0); 73 } 74 75 public void testShortCircuitGreater() { 76 assertTrue(ComparisonChain.start() 77 .compare("b", "a") 78 .compare(DONT_COMPARE_ME, DONT_COMPARE_ME) 79 .result() > 0); 80 } 81 testShortCircuitSecondStep()82 public void testShortCircuitSecondStep() { 83 assertTrue(ComparisonChain.start() 84 .compare("a", "a") 85 .compare("a", "b") 86 .compare(DONT_COMPARE_ME, DONT_COMPARE_ME) 87 .result() < 0); 88 } 89 90 public void testCompareFalseFirst() { 91 assertTrue(ComparisonChain.start().compareFalseFirst(true, true).result() == 0); 92 assertTrue(ComparisonChain.start().compareFalseFirst(true, false).result() > 0); 93 assertTrue(ComparisonChain.start().compareFalseFirst(false, true).result() < 0); 94 assertTrue(ComparisonChain.start().compareFalseFirst(false, false).result() == 0); 95 } 96 97 public void testCompareTrueFirst() { 98 assertTrue(ComparisonChain.start().compareTrueFirst(true, true).result() == 0); 99 assertTrue(ComparisonChain.start().compareTrueFirst(true, false).result() < 0); 100 assertTrue(ComparisonChain.start().compareTrueFirst(false, true).result() > 0); 101 assertTrue(ComparisonChain.start().compareTrueFirst(false, false).result() == 0); 102 } 103 } 104