Coverage Summary for Class: MapPutIfAbsentTester (com.google.common.collect.testing.testers)

1 /*
2  * Copyright (C) 2015 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_KEYS;
21 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
22 import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_PUT;
23 
24 import com.google.common.annotations.GwtCompatible;
25 import com.google.common.collect.testing.AbstractMapTester;
26 import com.google.common.collect.testing.features.CollectionSize;
27 import com.google.common.collect.testing.features.MapFeature;
28 import java.util.Map;
29 import org.junit.Ignore;
30 
31 /**
32  * A generic JUnit test which tests {@link Map#putIfAbsent}. Can't be invoked directly; please see
33  * {@link com.google.common.collect.testing.MapTestSuiteBuilder}.
34  *
35  * @author Louis Wasserman
36  */
37 @GwtCompatible
38 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
39 public class MapPutIfAbsentTester<K, V> extends AbstractMapTester<K, V> {
40 
41   @MapFeature.Require(SUPPORTS_PUT)
42   public void testPutIfAbsent_supportedAbsent() {
43     assertNull(
44         "putIfAbsent(notPresent, value) should return null", getMap().putIfAbsent(k3(), v3()));
45     expectAdded(e3());
46   }
47 
48   @MapFeature.Require(SUPPORTS_PUT)
49   @CollectionSize.Require(absent = ZERO)
50   public void testPutIfAbsent_supportedPresent() {
51     assertEquals(
52         "putIfAbsent(present, value) should return existing value",
53         v0(),
54         getMap().putIfAbsent(k0(), v3()));
55     expectUnchanged();
56   }
57 
58   @MapFeature.Require(absent = SUPPORTS_PUT)
59   public void testPutIfAbsent_unsupportedAbsent() {
60     try {
61       getMap().putIfAbsent(k3(), v3());
62       fail("putIfAbsent(notPresent, value) should throw");
63     } catch (UnsupportedOperationException expected) {
64     }
65     expectUnchanged();
66     expectMissing(e3());
67   }
68 
69   @MapFeature.Require(absent = SUPPORTS_PUT)
70   @CollectionSize.Require(absent = ZERO)
71   public void testPutIfAbsent_unsupportedPresentExistingValue() {
72     try {
73       assertEquals(
74           "putIfAbsent(present, existingValue) should return present or throw",
75           v0(),
76           getMap().putIfAbsent(k0(), v0()));
77     } catch (UnsupportedOperationException tolerated) {
78     }
79     expectUnchanged();
80   }
81 
82   @MapFeature.Require(absent = SUPPORTS_PUT)
83   @CollectionSize.Require(absent = ZERO)
84   public void testPutIfAbsent_unsupportedPresentDifferentValue() {
85     try {
86       getMap().putIfAbsent(k0(), v3());
87     } catch (UnsupportedOperationException tolerated) {
88     }
89     expectUnchanged();
90   }
91 
92   @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEYS)
93   public void testPutIfAbsent_nullKeyUnsupported() {
94     try {
95       getMap().putIfAbsent(null, v3());
96       fail("putIfAbsent(null, value) should throw");
97     } catch (NullPointerException expected) {
98     }
99     expectUnchanged();
100     expectNullKeyMissingWhenNullKeysUnsupported(
101         "Should not contain null key after unsupported putIfAbsent(null, value)");
102   }
103 
104   @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
105   public void testPutIfAbsent_nullValueUnsupported() {
106     try {
107       getMap().putIfAbsent(k3(), null);
108       fail("putIfAbsent(key, null) should throw");
109     } catch (NullPointerException expected) {
110     }
111     expectUnchanged();
112     expectNullValueMissingWhenNullValuesUnsupported(
113         "Should not contain null value after unsupported put(key, null)");
114   }
115 
116   @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
117   @CollectionSize.Require(absent = ZERO)
118   public void testPutIfAbsent_putWithNullValueUnsupported() {
119     try {
120       getMap().putIfAbsent(k0(), null);
121     } catch (NullPointerException tolerated) {
122     }
123     expectUnchanged();
124     expectNullValueMissingWhenNullValuesUnsupported(
125         "Should not contain null after unsupported putIfAbsent(present, null)");
126   }
127 }