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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)
40    public void testContains_yes() {
41      assertTrue("contains(present) should return true", collection.contains(e0()));
42    }
43  
44    public void testContains_no() {
45      assertFalse("contains(notPresent) should return false", collection.contains(e3()));
46    }
47  
48    @CollectionFeature.Require(ALLOWS_NULL_QUERIES)
49    public void testContains_nullNotContainedButQueriesSupported() {
50      assertFalse("contains(null) should return false", collection.contains(null));
51    }
52  
53    @CollectionFeature.Require(absent = ALLOWS_NULL_QUERIES)
54    public void testContains_nullNotContainedAndUnsupported() {
55      expectNullMissingWhenNullUnsupported("contains(null) should return false or throw");
56    }
57  
58    @CollectionFeature.Require(ALLOWS_NULL_VALUES)
59    @CollectionSize.Require(absent = ZERO)
60    public void testContains_nonNullWhenNullContained() {
61      initCollectionWithNullElement();
62      assertFalse("contains(notPresent) should return false", collection.contains(e3()));
63    }
64  
65    @CollectionFeature.Require(ALLOWS_NULL_VALUES)
66    @CollectionSize.Require(absent = ZERO)
67    public void testContains_nullContained() {
68      initCollectionWithNullElement();
69      assertTrue("contains(null) should return true", collection.contains(null));
70    }
71  
72    public void testContains_wrongType() {
73      try {
74        assertFalse(
75            "contains(wrongType) should return false or throw", collection.contains(WrongType.VALUE));
76      } catch (ClassCastException tolerated) {
77      }
78    }
79  }