Coverage Summary for Class: SetEqualsTester (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.Helpers;
23 import com.google.common.collect.testing.MinimalSet;
24 import com.google.common.collect.testing.features.CollectionFeature;
25 import com.google.common.collect.testing.features.CollectionSize;
26 import java.util.Collection;
27 import java.util.Set;
28 import org.junit.Ignore;
29 
30 /**
31  * Tests {@link java.util.Set#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 SetEqualsTester<E> extends AbstractSetTester<E> {
38   public void testEquals_otherSetWithSameElements() {
39     assertTrue(
40         "A Set should equal any other Set containing the same elements.",
41         getSet().equals(MinimalSet.from(getSampleElements())));
42   }
43 
44   @CollectionSize.Require(absent = CollectionSize.ZERO)
45   public void testEquals_otherSetWithDifferentElements() {
46     Collection<E> elements = getSampleElements(getNumElements() - 1);
47     elements.add(getSubjectGenerator().samples().e3());
48 
49     assertFalse(
50         "A Set should not equal another Set containing different elements.",
51         getSet().equals(MinimalSet.from(elements)));
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(
62         "A Set should equal any other Set containing the same elements,"
63             + " even if some elements are null.",
64         getSet().equals(MinimalSet.from(elements)));
65   }
66 
67   @CollectionSize.Require(absent = CollectionSize.ZERO)
68   public void testEquals_otherContainsNull() {
69     Collection<E> elements = getSampleElements(getNumElements() - 1);
70     elements.add(null);
71     Set<E> other = MinimalSet.from(elements);
72 
73     assertFalse(
74         "Two Sets should not be equal if exactly one of them contains null.",
75         getSet().equals(other));
76   }
77 
78   @CollectionSize.Require(absent = CollectionSize.ZERO)
79   public void testEquals_smallerSet() {
80     Collection<E> fewerElements = getSampleElements(getNumElements() - 1);
81     assertFalse(
82         "Sets of different sizes should not be equal.",
83         getSet().equals(MinimalSet.from(fewerElements)));
84   }
85 
86   public void testEquals_largerSet() {
87     Collection<E> moreElements = getSampleElements(getNumElements() + 1);
88     assertFalse(
89         "Sets of different sizes should not be equal.",
90         getSet().equals(MinimalSet.from(moreElements)));
91   }
92 
93   public void testEquals_list() {
94     assertFalse("A List should never equal a Set.", getSet().equals(Helpers.copyToList(getSet())));
95   }
96 }