1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 import java.io.ByteArrayInputStream;
25 import java.io.ByteArrayOutputStream;
26 import java.io.IOException;
27 import java.io.ObjectInputStream;
28 import java.io.ObjectOutputStream;
29 import java.util.ArrayList;
30 import java.util.Arrays;
31 import java.util.Collections;
32 import java.util.Iterator;
33 import java.util.List;
34
35 import org.testng.annotations.DataProvider;
36 import org.testng.annotations.Test;
37
38 import static java.util.Arrays.asList;
39
40 import static org.testng.Assert.assertEquals;
41 import static org.testng.Assert.assertFalse;
42 import static org.testng.Assert.assertTrue;
43 import static org.testng.Assert.fail;
44
45 /*
46 * @test
47 * @bug 8048330
48 * @summary Test convenience static factory methods on List.
49 * @run testng ListFactories
50 */
51
52 public class ListFactories {
53
54 static final int NUM_STRINGS = 20; // should be larger than the largest fixed-arg overload
55 static final String[] stringArray;
56 static {
57 String[] sa = new String[NUM_STRINGS];
58 for (int i = 0; i < NUM_STRINGS; i++) {
59 sa[i] = String.valueOf((char)('a' + i));
60 }
61 stringArray = sa;
62 }
63
64 // returns array of [actual, expected]
65 static Object[] a(List<String> act, List<String> exp) {
66 return new Object[] { act, exp };
67 }
68
69 @DataProvider(name="empty")
70 public Iterator<Object[]> empty() {
71 return Collections.singletonList(
72 a(List.of(), Collections.emptyList())
73 ).iterator();
74 }
75
76 @DataProvider(name="nonempty")
77 public Iterator<Object[]> nonempty() {
78 return asList(
79 a(List.of("a"),
80 asList("a")),
81 a(List.of("a", "b"),
82 asList("a", "b")),
83 a(List.of("a", "b", "c"),
84 asList("a", "b", "c")),
85 a(List.of("a", "b", "c", "d"),
86 asList("a", "b", "c", "d")),
87 a(List.of("a", "b", "c", "d", "e"),
88 asList("a", "b", "c", "d", "e")),
89 a(List.of("a", "b", "c", "d", "e", "f"),
90 asList("a", "b", "c", "d", "e", "f")),
91 a(List.of("a", "b", "c", "d", "e", "f", "g"),
92 asList("a", "b", "c", "d", "e", "f", "g")),
93 a(List.of("a", "b", "c", "d", "e", "f", "g", "h"),
94 asList("a", "b", "c", "d", "e", "f", "g", "h")),
95 a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i"),
96 asList("a", "b", "c", "d", "e", "f", "g", "h", "i")),
97 a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", "j"),
98 asList("a", "b", "c", "d", "e", "f", "g", "h", "i", "j")),
99 a(List.of(stringArray),
100 asList(stringArray))
101 ).iterator();
102 }
103
104 @DataProvider(name="all")
105 public Iterator<Object[]> all() {
106 List<Object[]> all = new ArrayList<>();
107 empty().forEachRemaining(all::add);
108 nonempty().forEachRemaining(all::add);
109 return all.iterator();
110 }
111
112 @Test(dataProvider="all", expectedExceptions=UnsupportedOperationException.class)
113 public void cannotAddLast(List<String> act, List<String> exp) {
114 act.add("x");
115 }
116
117 @Test(dataProvider="all", expectedExceptions=UnsupportedOperationException.class)
118 public void cannotAddFirst(List<String> act, List<String> exp) {
119 act.add(0, "x");
120 }
121
122 @Test(dataProvider="nonempty", expectedExceptions=UnsupportedOperationException.class)
123 public void cannotRemove(List<String> act, List<String> exp) {
124 act.remove(0);
125 }
126
127 @Test(dataProvider="nonempty", expectedExceptions=UnsupportedOperationException.class)
128 public void cannotSet(List<String> act, List<String> exp) {
129 act.set(0, "x");
130 }
131
132 @Test(dataProvider="all")
133 public void contentsMatch(List<String> act, List<String> exp) {
134 assertEquals(act, exp);
135 }
136
137 @Test(expectedExceptions=NullPointerException.class)
138 public void nullDisallowed1() {
139 List.of((Object)null); // force one-arg overload
140 }
141
142 @Test(expectedExceptions=NullPointerException.class)
143 public void nullDisallowed2a() {
144 List.of("a", null);
145 }
146
147 @Test(expectedExceptions=NullPointerException.class)
148 public void nullDisallowed2b() {
149 List.of(null, "b");
150 }
151
152 @Test(expectedExceptions=NullPointerException.class)
153 public void nullDisallowed3() {
154 List.of("a", "b", null);
155 }
156
157 @Test(expectedExceptions=NullPointerException.class)
158 public void nullDisallowed4() {
159 List.of("a", "b", "c", null);
160 }
161
162 @Test(expectedExceptions=NullPointerException.class)
163 public void nullDisallowed5() {
164 List.of("a", "b", "c", "d", null);
165 }
166
167 @Test(expectedExceptions=NullPointerException.class)
168 public void nullDisallowed6() {
169 List.of("a", "b", "c", "d", "e", null);
170 }
171
172 @Test(expectedExceptions=NullPointerException.class)
173 public void nullDisallowed7() {
174 List.of("a", "b", "c", "d", "e", "f", null);
175 }
176
177 @Test(expectedExceptions=NullPointerException.class)
178 public void nullDisallowed8() {
179 List.of("a", "b", "c", "d", "e", "f", "g", null);
180 }
181
182 @Test(expectedExceptions=NullPointerException.class)
183 public void nullDisallowed9() {
184 List.of("a", "b", "c", "d", "e", "f", "g", "h", null);
185 }
186
187 @Test(expectedExceptions=NullPointerException.class)
188 public void nullDisallowed10() {
189 List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", null);
190 }
191
192 @Test(expectedExceptions=NullPointerException.class)
193 public void nullDisallowedN() {
194 String[] array = stringArray.clone();
195 array[0] = null;
196 List.of(array);
197 }
198
199 @Test(expectedExceptions=NullPointerException.class)
200 public void nullArrayDisallowed() {
201 List.of((Object[])null);
202 }
203
204 @Test
205 public void ensureArrayCannotModifyList() {
206 String[] array = stringArray.clone();
207 List<String> list = List.of(array);
208 array[0] = "xyzzy";
209 assertEquals(list, Arrays.asList(stringArray));
210 }
211
212 @Test(dataProvider="all")
213 public void serialEquality(List<String> act, List<String> exp) {
214 // assume that act.equals(exp) tested elsewhere
215 List<String> copy = serialClone(act);
216 assertEquals(act, copy);
217 assertEquals(copy, exp);
218 }
219
220 @SuppressWarnings("unchecked")
221 static <T> T serialClone(T obj) {
222 try {
223 ByteArrayOutputStream baos = new ByteArrayOutputStream();
224 ObjectOutputStream oos = new ObjectOutputStream(baos);
225 oos.writeObject(obj);
226 oos.close();
227 ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
228 ObjectInputStream ois = new ObjectInputStream(bais);
229 return (T) ois.readObject();
230 } catch (IOException | ClassNotFoundException e) {
231 throw new AssertionError(e);
232 }
233 }
234 }