1/*
2 * Copyright (c) 2016, 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 8139233
27 * @summary ensure entry set's iterator doesn't have side effects on the entry set
28 * @run testng EntrySetIterator
29 */
30
31import java.util.*;
32import org.testng.annotations.Test;
33import static org.testng.Assert.assertTrue;
34import static org.testng.Assert.assertEquals;
35
36public class EntrySetIterator {
37    @Test
38    public void main() {
39        Map<String, String> map = Map.of("a", "1", "b", "2", "c", "3");
40        Set<Map.Entry<String, String>> entrySet = map.entrySet();
41        Iterator<Map.Entry<String, String>> iterator = entrySet.iterator();
42
43        assertTrue(iterator.hasNext());
44
45        // copying implicitly iterates an iterator
46        Set<Map.Entry<String, String>> copy1 = new HashSet<>(entrySet);
47        Set<Map.Entry<String, String>> copy2 = new HashSet<>(entrySet);
48
49        assertEquals(copy2, copy1);
50        assertTrue(iterator.hasNext());
51    }
52}
53