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 21 * questions. 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