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.*;
21 
22 import com.google.common.annotations.GwtCompatible;
23 import com.google.common.collect.testing.AbstractMapTester;
24 import com.google.common.collect.testing.WrongType;
25 import com.google.common.collect.testing.features.CollectionSize;
26 import com.google.common.collect.testing.features.MapFeature;
27 
28 /**
29  * A generic JUnit test which tests {@code containsValue()} operations on a map.
30  * Can't be invoked directly; please see
31  * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
32  *
33  * @author George van den Driessche
34  * @author Chris Povirk
35  */
36 @GwtCompatible
37 public class MapContainsValueTester<K, V> extends AbstractMapTester<K, V> {
38   @CollectionSize.Require(absent = ZERO)
testContains_yes()39   public void testContains_yes() {
40     assertTrue("containsValue(present) should return true",
41         getMap().containsValue(samples.e0.getValue()));
42   }
43 
testContains_no()44   public void testContains_no() {
45     assertFalse("containsValue(notPresent) should return false",
46         getMap().containsValue(samples.e3.getValue()));
47   }
48 
49   @MapFeature.Require(ALLOWS_NULL_VALUE_QUERIES)
testContains_nullNotContainedButAllowed()50   public void testContains_nullNotContainedButAllowed() {
51     assertFalse("containsValue(null) should return false",
52         getMap().containsValue(null));
53   }
54 
55   @MapFeature.Require(absent = ALLOWS_NULL_VALUE_QUERIES)
testContains_nullNotContainedAndUnsupported()56   public void testContains_nullNotContainedAndUnsupported() {
57     expectNullValueMissingWhenNullValuesUnsupported(
58         "containsValue(null) should return false or throw");
59   }
60 
61   @MapFeature.Require(ALLOWS_NULL_VALUES)
62   @CollectionSize.Require(absent = ZERO)
testContains_nonNullWhenNullContained()63   public void testContains_nonNullWhenNullContained() {
64     initMapWithNullValue();
65     assertFalse("containsValue(notPresent) should return false",
66         getMap().containsValue(samples.e3.getValue()));
67   }
68 
69   @MapFeature.Require(ALLOWS_NULL_VALUES)
70   @CollectionSize.Require(absent = ZERO)
testContains_nullContained()71   public void testContains_nullContained() {
72     initMapWithNullValue();
73     assertTrue("containsValue(null) should return true",
74         getMap().containsValue(null));
75   }
76 
testContains_wrongType()77   public void testContains_wrongType() {
78     try {
79       //noinspection SuspiciousMethodCalls
80       assertFalse("containsValue(wrongType) should return false or throw",
81           getMap().containsValue(WrongType.VALUE));
82     } catch (ClassCastException tolerated) {
83     }
84   }
85 }
86