001/* 002 * Copyright (C) 2008 The Guava Authors 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package com.google.common.collect.testing.testers; 018 019import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES; 020 021import com.google.common.annotations.GwtCompatible; 022import com.google.common.collect.testing.Helpers; 023import com.google.common.collect.testing.MinimalSet; 024import com.google.common.collect.testing.features.CollectionFeature; 025import com.google.common.collect.testing.features.CollectionSize; 026import java.util.Collection; 027import java.util.Set; 028import org.junit.Ignore; 029 030/** 031 * Tests {@link java.util.Set#equals}. 032 * 033 * @author George van den Driessche 034 */ 035@GwtCompatible 036@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests. 037public class SetEqualsTester<E> extends AbstractSetTester<E> { 038 public void testEquals_otherSetWithSameElements() { 039 assertTrue( 040 "A Set should equal any other Set containing the same elements.", 041 getSet().equals(MinimalSet.from(getSampleElements()))); 042 } 043 044 @CollectionSize.Require(absent = CollectionSize.ZERO) 045 public void testEquals_otherSetWithDifferentElements() { 046 Collection<E> elements = getSampleElements(getNumElements() - 1); 047 elements.add(getSubjectGenerator().samples().e3()); 048 049 assertFalse( 050 "A Set should not equal another Set containing different elements.", 051 getSet().equals(MinimalSet.from(elements))); 052 } 053 054 @CollectionSize.Require(absent = CollectionSize.ZERO) 055 @CollectionFeature.Require(ALLOWS_NULL_VALUES) 056 public void testEquals_containingNull() { 057 Collection<E> elements = getSampleElements(getNumElements() - 1); 058 elements.add(null); 059 060 collection = getSubjectGenerator().create(elements.toArray()); 061 assertTrue( 062 "A Set should equal any other Set containing the same elements," 063 + " even if some elements are null.", 064 getSet().equals(MinimalSet.from(elements))); 065 } 066 067 @CollectionSize.Require(absent = CollectionSize.ZERO) 068 public void testEquals_otherContainsNull() { 069 Collection<E> elements = getSampleElements(getNumElements() - 1); 070 elements.add(null); 071 Set<E> other = MinimalSet.from(elements); 072 073 assertFalse( 074 "Two Sets should not be equal if exactly one of them contains null.", 075 getSet().equals(other)); 076 } 077 078 @CollectionSize.Require(absent = CollectionSize.ZERO) 079 public void testEquals_smallerSet() { 080 Collection<E> fewerElements = getSampleElements(getNumElements() - 1); 081 assertFalse( 082 "Sets of different sizes should not be equal.", 083 getSet().equals(MinimalSet.from(fewerElements))); 084 } 085 086 public void testEquals_largerSet() { 087 Collection<E> moreElements = getSampleElements(getNumElements() + 1); 088 assertFalse( 089 "Sets of different sizes should not be equal.", 090 getSet().equals(MinimalSet.from(moreElements))); 091 } 092 093 public void testEquals_list() { 094 assertFalse("A List should never equal a Set.", getSet().equals(Helpers.copyToList(getSet()))); 095 } 096}