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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.CollectionSize.ZERO;
20  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
21  import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUE_QUERIES;
22  
23  import com.google.common.annotations.GwtCompatible;
24  import com.google.common.collect.testing.AbstractMapTester;
25  import com.google.common.collect.testing.WrongType;
26  import com.google.common.collect.testing.features.CollectionSize;
27  import com.google.common.collect.testing.features.MapFeature;
28  
29  /**
30   * A generic JUnit test which tests {@code containsValue()} operations on a map.
31   * Can't be invoked directly; please see
32   * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
33   *
34   * @author George van den Driessche
35   * @author Chris Povirk
36   */
37  @GwtCompatible
38  public class MapContainsValueTester<K, V> extends AbstractMapTester<K, V> {
39    @CollectionSize.Require(absent = ZERO)
40    public void testContains_yes() {
41      assertTrue("containsValue(present) should return true", getMap().containsValue(v0()));
42    }
43  
44    public void testContains_no() {
45      assertFalse("containsValue(notPresent) should return false", getMap().containsValue(v3()));
46    }
47  
48    @MapFeature.Require(ALLOWS_NULL_VALUE_QUERIES)
49    public void testContains_nullNotContainedButAllowed() {
50      assertFalse("containsValue(null) should return false", getMap().containsValue(null));
51    }
52  
53    @MapFeature.Require(absent = ALLOWS_NULL_VALUE_QUERIES)
54    public void testContains_nullNotContainedAndUnsupported() {
55      expectNullValueMissingWhenNullValuesUnsupported(
56          "containsValue(null) should return false or throw");
57    }
58  
59    @MapFeature.Require(ALLOWS_NULL_VALUES)
60    @CollectionSize.Require(absent = ZERO)
61    public void testContains_nonNullWhenNullContained() {
62      initMapWithNullValue();
63      assertFalse("containsValue(notPresent) should return false", getMap().containsValue(v3()));
64    }
65  
66    @MapFeature.Require(ALLOWS_NULL_VALUES)
67    @CollectionSize.Require(absent = ZERO)
68    public void testContains_nullContained() {
69      initMapWithNullValue();
70      assertTrue("containsValue(null) should return true", getMap().containsValue(null));
71    }
72  
73    public void testContains_wrongType() {
74      try {
75        //noinspection SuspiciousMethodCalls
76        assertFalse(
77            "containsValue(wrongType) should return false or throw",
78            getMap().containsValue(WrongType.VALUE));
79      } catch (ClassCastException tolerated) {
80      }
81    }
82  }