1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 */
22
23 /*
24 * This file is available under and governed by the GNU General Public
25 * License version 2 only, as published by the Free Software Foundation.
26 * However, the following notice accompanied the original version of this
27 * file:
28 *
29 * Written by Doug Lea and Martin Buchholz with assistance from
30 * members of JCP JSR-166 Expert Group and released to the public
31 * domain, as explained at
32 * http://creativecommons.org/publicdomain/zero/1.0/
33 */
34
35 import junit.framework.Test;
36
37 import java.util.ArrayList;
38 import java.util.Iterator;
39 import java.util.List;
40 import java.util.Map;
41 import java.util.concurrent.ThreadLocalRandom;
42
43 /**
44 * Contains tests applicable to all Map implementations.
45 */
46 public class MapTest extends JSR166TestCase {
47 final MapImplementation impl;
48
49 /** Tests are parameterized by a Map implementation. */
50 MapTest(MapImplementation impl, String methodName) {
51 super(methodName);
52 this.impl = impl;
53 }
54
55 public static Test testSuite(MapImplementation impl) {
56 return newTestSuite(
57 parameterizedTestSuite(MapTest.class,
58 MapImplementation.class,
59 impl));
60 }
61
62 public void testImplSanity() {
63 final ThreadLocalRandom rnd = ThreadLocalRandom.current();
64 {
65 Map m = impl.emptyMap();
66 assertTrue(m.isEmpty());
67 assertEquals(0, m.size());
68 Object k = impl.makeKey(rnd.nextInt());
69 Object v = impl.makeValue(rnd.nextInt());
70 m.put(k, v);
71 assertFalse(m.isEmpty());
72 assertEquals(1, m.size());
73 assertTrue(m.containsKey(k));
74 assertTrue(m.containsValue(v));
75 }
76 {
77 Map m = impl.emptyMap();
78 Object v = impl.makeValue(rnd.nextInt());
79 if (impl.permitsNullKeys()) {
80 m.put(null, v);
81 assertTrue(m.containsKey(null));
82 assertTrue(m.containsValue(v));
83 } else {
84 assertThrows(NullPointerException.class, () -> m.put(null, v));
85 }
86 }
87 {
88 Map m = impl.emptyMap();
89 Object k = impl.makeKey(rnd.nextInt());
90 if (impl.permitsNullValues()) {
91 m.put(k, null);
92 assertTrue(m.containsKey(k));
93 assertTrue(m.containsValue(null));
94 } else {
95 assertThrows(NullPointerException.class, () -> m.put(k, null));
96 }
97 }
98 {
99 Map m = impl.emptyMap();
100 Object k = impl.makeKey(rnd.nextInt());
101 Object v1 = impl.makeValue(rnd.nextInt());
102 Object v2 = impl.makeValue(rnd.nextInt());
103 m.put(k, v1);
104 if (impl.supportsSetValue()) {
105 ((Map.Entry)(m.entrySet().iterator().next())).setValue(v2);
106 assertSame(v2, m.get(k));
107 assertTrue(m.containsKey(k));
108 assertTrue(m.containsValue(v2));
109 assertFalse(m.containsValue(v1));
110 } else {
111 assertThrows(UnsupportedOperationException.class,
112 () -> ((Map.Entry)(m.entrySet().iterator().next())).setValue(v2));
113 }
114 }
115 }
116
117 /**
118 * Tests and extends the scenario reported in
119 * https://bugs.openjdk.java.net/browse/JDK-8186171
120 * HashMap: Entry.setValue may not work after Iterator.remove() called for previous entries
121 * ant -Djsr166.tckTestClass=HashMapTest -Djsr166.methodFilter=testBug8186171 -Djsr166.runsPerTest=1000 tck
122 */
123 public void testBug8186171() {
124 if (!impl.supportsSetValue()) return;
125 final ThreadLocalRandom rnd = ThreadLocalRandom.current();
126 final boolean permitsNullValues = impl.permitsNullValues();
127 final Object v1 = (permitsNullValues && rnd.nextBoolean())
128 ? null : impl.makeValue(1);
129 final Object v2 = (permitsNullValues && rnd.nextBoolean() && v1 != null)
130 ? null : impl.makeValue(2);
131
132 // If true, always lands in first bucket in hash tables.
133 final boolean poorHash = rnd.nextBoolean();
134 class Key implements Comparable<Key> {
135 final int i;
136 Key(int i) { this.i = i; }
137 public int hashCode() { return poorHash ? 0 : super.hashCode(); }
138 public int compareTo(Key x) {
139 return Integer.compare(this.i, x.i);
140 }
141 }
142
143 // Both HashMap and ConcurrentHashMap have:
144 // TREEIFY_THRESHOLD = 8; UNTREEIFY_THRESHOLD = 6;
145 final int size = rnd.nextInt(1, 25);
146
147 List<Key> keys = new ArrayList<>();
148 for (int i = size; i-->0; ) keys.add(new Key(i));
149 Key keyToFrob = keys.get(rnd.nextInt(keys.size()));
150
151 Map<Key, Object> m = impl.emptyMap();
152 for (Key key : keys) m.put(key, v1);
153
154 for (Iterator<Map.Entry<Key, Object>> it = m.entrySet().iterator();
155 it.hasNext(); ) {
156 Map.Entry<Key, Object> entry = it.next();
157 if (entry.getKey() == keyToFrob)
158 entry.setValue(v2); // does this have the expected effect?
159 else
160 it.remove();
161 }
162
163 assertFalse(m.containsValue(v1));
164 assertTrue(m.containsValue(v2));
165 assertTrue(m.containsKey(keyToFrob));
166 assertEquals(1, m.size());
167 }
168
169 /**
170 * "Missing" test found while investigating JDK-8210280.
171 * See discussion on mailing list.
172 * TODO: randomize
173 */
174 public void testBug8210280() {
175 Map m = impl.emptyMap();
176 for (int i = 0; i < 4; i++) m.put(7 + i * 16, 0);
177 Map more = impl.emptyMap();
178 for (int i = 0; i < 128; i++) more.put(-i, 42);
179 m.putAll(more);
180 for (int i = 0; i < 4; i++) assertEquals(0, m.get(7 + i * 16));
181 }
182
183 // public void testFailsIntentionallyForDebugging() {
184 // fail(impl.klazz().getSimpleName());
185 // }
186 }