Coverage Summary for Class: ConcurrentMapPutIfAbsentTester (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.Entry;
29 import java.util.concurrent.ConcurrentMap;
30 import org.junit.Ignore;
31 
32 /**
33  * A generic JUnit test which tests {@code putIfAbsent} operations on a concurrent map. Can't be
34  * invoked directly; please see {@link
35  * com.google.common.collect.testing.ConcurrentMapTestSuiteBuilder}.
36  *
37  * @author Louis Wasserman
38  */
39 @GwtCompatible
40 @Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
41 public class ConcurrentMapPutIfAbsentTester<K, V> extends AbstractMapTester<K, V> {
42   @Override
43   protected ConcurrentMap<K, V> getMap() {
44     return (ConcurrentMap<K, V>) super.getMap();
45   }
46 
47   @MapFeature.Require(SUPPORTS_PUT)
48   public void testPutIfAbsent_supportedAbsent() {
49     assertNull("putIfAbsent(notPresent, value) should return null", putIfAbsent(e3()));
50     expectAdded(e3());
51   }
52 
53   @MapFeature.Require(SUPPORTS_PUT)
54   @CollectionSize.Require(absent = ZERO)
55   public void testPutIfAbsent_supportedPresent() {
56     assertEquals(
57         "putIfAbsent(present, value) should return existing value",
58         v0(),
59         getMap().putIfAbsent(k0(), v3()));
60     expectUnchanged();
61   }
62 
63   @MapFeature.Require(absent = SUPPORTS_PUT)
64   public void testPutIfAbsent_unsupportedAbsent() {
65     try {
66       putIfAbsent(e3());
67       fail("putIfAbsent(notPresent, value) should throw");
68     } catch (UnsupportedOperationException expected) {
69     }
70     expectUnchanged();
71     expectMissing(e3());
72   }
73 
74   @MapFeature.Require(absent = SUPPORTS_PUT)
75   @CollectionSize.Require(absent = ZERO)
76   public void testPutIfAbsent_unsupportedPresentExistingValue() {
77     try {
78       assertEquals(
79           "putIfAbsent(present, existingValue) should return present or throw",
80           v0(),
81           putIfAbsent(e0()));
82     } catch (UnsupportedOperationException tolerated) {
83     }
84     expectUnchanged();
85   }
86 
87   @MapFeature.Require(absent = SUPPORTS_PUT)
88   @CollectionSize.Require(absent = ZERO)
89   public void testPutIfAbsent_unsupportedPresentDifferentValue() {
90     try {
91       getMap().putIfAbsent(k0(), v3());
92     } catch (UnsupportedOperationException tolerated) {
93     }
94     expectUnchanged();
95   }
96 
97   @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEYS)
98   public void testPutIfAbsent_nullKeyUnsupported() {
99     try {
100       getMap().putIfAbsent(null, v3());
101       fail("putIfAbsent(null, value) should throw");
102     } catch (NullPointerException expected) {
103     }
104     expectUnchanged();
105     expectNullKeyMissingWhenNullKeysUnsupported(
106         "Should not contain null key after unsupported putIfAbsent(null, value)");
107   }
108 
109   @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
110   public void testPutIfAbsent_nullValueUnsupported() {
111     try {
112       getMap().putIfAbsent(k3(), null);
113       fail("putIfAbsent(key, null) should throw");
114     } catch (NullPointerException expected) {
115     }
116     expectUnchanged();
117     expectNullValueMissingWhenNullValuesUnsupported(
118         "Should not contain null value after unsupported put(key, null)");
119   }
120 
121   @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_VALUES)
122   @CollectionSize.Require(absent = ZERO)
123   public void testPutIfAbsent_putWithNullValueUnsupported() {
124     try {
125       getMap().putIfAbsent(k0(), null);
126     } catch (NullPointerException tolerated) {
127     }
128     expectUnchanged();
129     expectNullValueMissingWhenNullValuesUnsupported(
130         "Should not contain null after unsupported putIfAbsent(present, null)");
131   }
132 
133   private V putIfAbsent(Entry<K, V> entry) {
134     return getMap().putIfAbsent(entry.getKey(), entry.getValue());
135   }
136 }