1 /*
2  * Copyright (C) 2007 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_QUERIES;
20 import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
21 import static com.google.common.collect.testing.features.CollectionSize.ZERO;
22 
23 import com.google.common.annotations.GwtCompatible;
24 import com.google.common.collect.testing.AbstractCollectionTester;
25 import com.google.common.collect.testing.WrongType;
26 import com.google.common.collect.testing.features.CollectionFeature;
27 import com.google.common.collect.testing.features.CollectionSize;
28 
29 /**
30  * A generic JUnit test which tests {@code contains()} operations on a
31  * collection. Can't be invoked directly; please see
32  * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
33  *
34  * @author Kevin Bourrillion
35  * @author Chris Povirk
36  */
37 @GwtCompatible
38 public class CollectionContainsTester<E> extends AbstractCollectionTester<E> {
39   @CollectionSize.Require(absent = ZERO)
testContains_yes()40   public void testContains_yes() {
41     assertTrue("contains(present) should return true",
42         collection.contains(samples.e0));
43   }
44 
testContains_no()45   public void testContains_no() {
46     assertFalse("contains(notPresent) should return false",
47         collection.contains(samples.e3));
48   }
49 
50   @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
testContains_nullNotContainedButQueriesSupported()51   public void testContains_nullNotContainedButQueriesSupported() {
52     assertFalse("contains(null) should return false",
53         collection.contains(null));
54   }
55 
56   @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
testContains_nullNotContainedAndUnsupported()57   public void testContains_nullNotContainedAndUnsupported() {
58     expectNullMissingWhenNullUnsupported(
59         "contains(null) should return false or throw");
60   }
61 
62   @CollectionFeature.Require(ALLOWS_NULL_VALUES)
63   @CollectionSize.Require(absent = ZERO)
testContains_nonNullWhenNullContained()64   public void testContains_nonNullWhenNullContained() {
65     initCollectionWithNullElement();
66     assertFalse("contains(notPresent) should return false",
67         collection.contains(samples.e3));
68   }
69 
70   @CollectionFeature.Require(ALLOWS_NULL_VALUES)
71   @CollectionSize.Require(absent = ZERO)
testContains_nullContained()72   public void testContains_nullContained() {
73     initCollectionWithNullElement();
74     assertTrue("contains(null) should return true", collection.contains(null));
75   }
76 
testContains_wrongType()77   public void testContains_wrongType() {
78     try {
79       assertFalse("contains(wrongType) should return false or throw",
80           collection.contains(WrongType.VALUE));
81     } catch (ClassCastException tolerated) {
82     }
83   }
84 }
85