1 /* 2 * Copyright (C) 2008 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.testing.testers; 18 19 import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES; 20 21 import com.google.common.collect.testing.Helpers; 22 import com.google.common.collect.testing.MinimalSet; 23 import com.google.common.collect.testing.features.CollectionFeature; 24 import com.google.common.collect.testing.features.CollectionSize; 25 26 import java.util.Collection; 27 import java.util.Set; 28 29 /** 30 * Tests {@link java.util.Set#equals}. 31 * 32 * <p>This class is GWT compatible. 33 * 34 * @author George van den Driessche 35 */ 36 public class SetEqualsTester<E> extends AbstractSetTester<E> { 37 public void testEquals_otherSetWithSameElements() { 38 assertTrue( 39 "A Set should equal any other Set containing the same elements.", 40 getSet().equals(MinimalSet.from(getSampleElements()))); 41 } 42 43 @CollectionSize.Require(absent = CollectionSize.ZERO) 44 public void testEquals_otherSetWithDifferentElements() { 45 Collection<E> elements = getSampleElements(getNumElements() - 1); 46 elements.add(getSubjectGenerator().samples().e3); 47 48 assertFalse( 49 "A Set should not equal another Set containing different elements.", 50 getSet().equals(MinimalSet.from(elements)) 51 ); 52 } 53 54 @CollectionSize.Require(absent = CollectionSize.ZERO) 55 @CollectionFeature.Require(ALLOWS_NULL_VALUES) 56 public void testEquals_containingNull() { 57 Collection<E> elements = getSampleElements(getNumElements() - 1); 58 elements.add(null); 59 60 collection = getSubjectGenerator().create(elements.toArray()); 61 assertTrue("A Set should equal any other Set containing the same elements," 62 + " even if some elements are null.", 63 getSet().equals(MinimalSet.from(elements))); 64 } 65 66 @CollectionSize.Require(absent = CollectionSize.ZERO) 67 public void testEquals_otherContainsNull() { 68 Collection<E> elements = getSampleElements(getNumElements() - 1); 69 elements.add(null); 70 Set<E> other = MinimalSet.from(elements); 71 72 assertFalse( 73 "Two Sets should not be equal if exactly one of them contains null.", 74 getSet().equals(other)); 75 } 76 77 @CollectionSize.Require(absent = CollectionSize.ZERO) 78 public void testEquals_smallerSet() { 79 Collection<E> fewerElements = getSampleElements(getNumElements() - 1); 80 assertFalse("Sets of different sizes should not be equal.", 81 getSet().equals(MinimalSet.from(fewerElements))); 82 } 83 84 public void testEquals_largerSet() { 85 Collection<E> moreElements = getSampleElements(getNumElements() + 1); 86 assertFalse("Sets of different sizes should not be equal.", 87 getSet().equals(MinimalSet.from(moreElements))); 88 } 89 90 public void testEquals_list() { 91 assertFalse("A List should never equal a Set.", 92 getSet().equals(Helpers.copyToList(getSet()))); 93 } 94 } 95
