1 /*
 2  * Copyright (c) 2016, 2026, 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 /*
25  * @test
26  * @bug 8155600
27  * @summary Tests for Arrays.asList()
28  * @run junit AsList
29  */
30 
31 import java.util.Arrays;
32 import java.util.Iterator;
33 import java.util.NoSuchElementException;
34 import java.util.stream.IntStream;
35 
36 import org.junit.jupiter.api.TestInstance;
37 import org.junit.jupiter.params.ParameterizedTest;
38 import org.junit.jupiter.params.provider.MethodSource;
39 
40 import static org.junit.jupiter.api.Assertions.*;
41 
42 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
43 public class AsList {
44     /*
45      * Iterator contract test
46      */
47     @ParameterizedTest
48     @MethodSource("arrays")
49     public void testIterator(Object[] array) {
50         Iterator<Object> itr = Arrays.asList(array).iterator();
51         for (Object o : array) {
52             assertTrue(itr.hasNext());
53             assertTrue(itr.hasNext()); // must be idempotent
54             assertSame(o, itr.next());
55             assertThrows(UnsupportedOperationException.class, itr::remove);
56         }
57         for (int i = 0; i < 3; i++) {
58             assertFalse(itr.hasNext());
59             assertThrows(NoSuchElementException.class, itr::next);
60         }
61     }
62 
63     public static Object[][] arrays() {
64         return new Object[][] {
65             { new Object[] { } },
66             { new Object[] { 1 } },
67             { new Object[] { null } },
68             { new Object[] { null, 1 } },
69             { new Object[] { 1, null } },
70             { new Object[] { null, null } },
71             { new Object[] { null, 1, 2 } },
72             { new Object[] { 1, null, 2 } },
73             { new Object[] { 1, 2, null } },
74             { new Object[] { null, null, null } },
75             { new Object[] { 1, 2, 3, null, 4 } },
76             { new Object[] { "a", "a", "a", "a" } },
77             { IntStream.range(0, 100).boxed().toArray() }
78         };
79     }
80 }