1 /*
2  * Copyright (c) 2020, 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
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22  */
23 package org.openjdk.tests.java.util.stream;
24 
25 import java.util.ArrayList;
26 import java.util.List;
27 import java.util.function.Function;
28 import java.util.stream.Collector;
29 import java.util.stream.Collectors;
30 
31 import org.testng.annotations.Test;
32 import static org.testng.Assert.*;
33 
34 /*
35  * @test
36  * @bug 8254090
37  * @summary Test for Collectors.toUnmodifiableList().
38  */
39 public class CollectorToUnmodListTest {
40     @SuppressWarnings("unchecked")
41     @Test
testFinisher()42     public void testFinisher() {
43         String[] array = { "x", "y", "z" };
44         List<String> in = new ArrayList<>() {
45             public Object[] toArray() {
46                 return array;
47             }
48         };
49         var finisher = (Function<List<String>, List<String>>)Collectors.<String>toUnmodifiableList().finisher();
50         assertThrows(IllegalArgumentException.class, () -> finisher.apply(in));
51   }
52 }
53