Coverage Summary for Class: ListEqualsTester (com.google.common.collect.testing.testers)

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.annotations.GwtCompatible;
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 import java.util.ArrayList;
26 import java.util.Collection;
27 import java.util.List;
28 import org.junit.Ignore;
29 
30 /**
31  * Tests {@link List#equals}.
32  *
33  * @author George van den Driessche
34  */
35 @GwtCompatible
36 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
37 public class ListEqualsTester<E> extends AbstractListTester<E> {
38   public void testEquals_otherListWithSameElements() {
39     assertTrue(
40         "A List should equal any other List containing the same elements.",
41         getList().equals(new ArrayList<E>(getOrderedElements())));
42   }
43 
44   @CollectionSize.Require(absent = CollectionSize.ZERO)
45   public void testEquals_otherListWithDifferentElements() {
46     ArrayList<E> other = new ArrayList<>(getSampleElements());
47     other.set(other.size() / 2, getSubjectGenerator().samples().e3());
48     assertFalse(
49         "A List should not equal another List containing different elements.",
50         getList().equals(other));
51   }
52 
53   @CollectionSize.Require(absent = CollectionSize.ZERO)
54   public void testEquals_otherListContainingNull() {
55     List<E> other = new ArrayList<>(getSampleElements());
56     other.set(other.size() / 2, null);
57     assertFalse(
58         "Two Lists should not be equal if exactly one of them has null at a given index.",
59         getList().equals(other));
60   }
61 
62   @CollectionSize.Require(absent = CollectionSize.ZERO)
63   @CollectionFeature.Require(ALLOWS_NULL_VALUES)
64   public void testEquals_containingNull() {
65     ArrayList<E> elements = new ArrayList<>(getSampleElements());
66     elements.set(elements.size() / 2, null);
67     collection = getSubjectGenerator().create(elements.toArray());
68     List<E> other = new ArrayList<>(getSampleElements());
69     assertFalse(
70         "Two Lists should not be equal if exactly one of them has null at a given index.",
71         getList().equals(other));
72   }
73 
74   @CollectionSize.Require(absent = CollectionSize.ZERO)
75   public void testEquals_shorterList() {
76     Collection<E> fewerElements = getSampleElements(getNumElements() - 1);
77     assertFalse(
78         "Lists of different sizes should not be equal.",
79         getList().equals(new ArrayList<E>(fewerElements)));
80   }
81 
82   public void testEquals_longerList() {
83     Collection<E> moreElements = getSampleElements(getNumElements() + 1);
84     assertFalse(
85         "Lists of different sizes should not be equal.",
86         getList().equals(new ArrayList<E>(moreElements)));
87   }
88 
89   public void testEquals_set() {
90     assertFalse("A List should never equal a Set.", getList().equals(MinimalSet.from(getList())));
91   }
92 }