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.MinimalSet; 023import com.google.common.collect.testing.features.CollectionFeature; 024import com.google.common.collect.testing.features.CollectionSize; 025import java.util.ArrayList; 026import java.util.Collection; 027import java.util.List; 028import org.junit.Ignore; 029 030/** 031 * Tests {@link List#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 ListEqualsTester<E> extends AbstractListTester<E> { 038 public void testEquals_otherListWithSameElements() { 039 assertTrue( 040 "A List should equal any other List containing the same elements.", 041 getList().equals(new ArrayList<E>(getOrderedElements()))); 042 } 043 044 @CollectionSize.Require(absent = CollectionSize.ZERO) 045 public void testEquals_otherListWithDifferentElements() { 046 ArrayList<E> other = new ArrayList<>(getSampleElements()); 047 other.set(other.size() / 2, getSubjectGenerator().samples().e3()); 048 assertFalse( 049 "A List should not equal another List containing different elements.", 050 getList().equals(other)); 051 } 052 053 @CollectionSize.Require(absent = CollectionSize.ZERO) 054 public void testEquals_otherListContainingNull() { 055 List<E> other = new ArrayList<>(getSampleElements()); 056 other.set(other.size() / 2, null); 057 assertFalse( 058 "Two Lists should not be equal if exactly one of them has null at a given index.", 059 getList().equals(other)); 060 } 061 062 @CollectionSize.Require(absent = CollectionSize.ZERO) 063 @CollectionFeature.Require(ALLOWS_NULL_VALUES) 064 public void testEquals_containingNull() { 065 ArrayList<E> elements = new ArrayList<>(getSampleElements()); 066 elements.set(elements.size() / 2, null); 067 collection = getSubjectGenerator().create(elements.toArray()); 068 List<E> other = new ArrayList<>(getSampleElements()); 069 assertFalse( 070 "Two Lists should not be equal if exactly one of them has null at a given index.", 071 getList().equals(other)); 072 } 073 074 @CollectionSize.Require(absent = CollectionSize.ZERO) 075 public void testEquals_shorterList() { 076 Collection<E> fewerElements = getSampleElements(getNumElements() - 1); 077 assertFalse( 078 "Lists of different sizes should not be equal.", 079 getList().equals(new ArrayList<E>(fewerElements))); 080 } 081 082 public void testEquals_longerList() { 083 Collection<E> moreElements = getSampleElements(getNumElements() + 1); 084 assertFalse( 085 "Lists of different sizes should not be equal.", 086 getList().equals(new ArrayList<E>(moreElements))); 087 } 088 089 public void testEquals_set() { 090 assertFalse("A List should never equal a Set.", getList().equals(MinimalSet.from(getList()))); 091 } 092}