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  * @library /test/lib
29  * @run junit AsList
30  */
31 
32 import java.time.LocalDate;
33 import java.util.Arrays;
34 import java.util.Iterator;
35 import java.util.NoSuchElementException;
36 import java.util.Optional;
37 import java.util.stream.IntStream;
38 
39 import jdk.test.lib.valueclass.AsValueClass;
40 
41 import org.junit.jupiter.api.TestInstance;
42 import org.junit.jupiter.params.ParameterizedTest;
43 import org.junit.jupiter.params.provider.MethodSource;
44 
45 import static org.junit.jupiter.api.Assertions.*;
46 
47 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
48 public class AsList {
49 
50     @AsValueClass
51     record V(int x) {}
52 
53     /*
54      * Iterator contract test
55      */
56     @ParameterizedTest
57     @MethodSource("arrays")
58     public void testIterator(Object[] array) {
59         Iterator<Object> itr = Arrays.asList(array).iterator();
60         for (Object o : array) {
61             assertTrue(itr.hasNext());
62             assertTrue(itr.hasNext()); // must be idempotent
63             assertSame(o, itr.next());
64             assertThrows(UnsupportedOperationException.class, itr::remove);
65         }
66         for (int i = 0; i < 3; i++) {
67             assertFalse(itr.hasNext());
68             assertThrows(NoSuchElementException.class, itr::next);
69         }
70     }
71 
72     public static Object[][] arrays() {
73         return new Object[][] {
74             { new Object[] { } },
75             { new Object[] { 1 } },
76             { new Object[] { null } },
77             { new Object[] { null, 1 } },
78             { new Object[] { 1, null } },
79             { new Object[] { null, null } },
80             { new Object[] { null, 1, 2 } },
81             { new Object[] { 1, null, 2 } },
82             { new Object[] { 1, 2, null } },
83             { new Object[] { null, null, null } },
84             { new Object[] { 1, 2, 3, null, 4 } },
85             { new Object[] { "a", "a", "a", "a" } },
86             { IntStream.range(0, 100).boxed().toArray() },
87             { new Object[] { new V(1), new V(2), null, new V(3) } },
88             { new Object[] { Integer.valueOf(1), Integer.valueOf(2), null, Integer.valueOf(3) } },
89             { new Object[] { LocalDate.of(2000, 1, 1), LocalDate.of(2000, 12, 31), LocalDate.now() } },
90             { new Object[] { Optional.of(1), Optional.empty(), Optional.of("a") } },
91             { new Object[] { Boolean.TRUE, Boolean.FALSE, null } }
92         };
93     }
94 }
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