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
17package com.google.common.collect.testing.testers;
18
19import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_QUERIES;
20import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
21import static com.google.common.collect.testing.features.CollectionSize.ZERO;
22
23import com.google.common.collect.testing.AbstractCollectionTester;
24import com.google.common.collect.testing.WrongType;
25import com.google.common.collect.testing.features.CollectionFeature;
26import com.google.common.collect.testing.features.CollectionSize;
27
28/**
29 * A generic JUnit test which tests {@code contains()} operations on a
30 * collection. Can't be invoked directly; please see
31 * {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
32 *
33 * <p>This class is GWT compatible.
34 *
35 * @author Kevin Bourrillion
36 * @author Chris Povirk
37 */
38public class CollectionContainsTester<E> extends AbstractCollectionTester<E> {
39  @CollectionSize.Require(absent = ZERO)
40  public void testContains_yes() {
41    assertTrue("contains(present) should return true",
42        collection.contains(samples.e0));
43  }
44
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)
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)
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)
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)
72  public void testContains_nullContained() {
73    initCollectionWithNullElement();
74    assertTrue("contains(null) should return true", collection.contains(null));
75  }
76
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