/*
 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package org.openjdk.tests.java.util.stream;

import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collector;
import java.util.stream.Collectors;

import org.testng.annotations.Test;
import static org.testng.Assert.*;

/*
 * @test
 * @bug 8254090
 * @summary Test for Collectors.toUnmodifiableList().
 */
public class CollectorToUnmodListTest {
    @SuppressWarnings("unchecked")
    @Test
    public void testFinisher() {
        String[] array = { "x", "y", "z" };
        List<String> in = new ArrayList<>() {
            public Object[] toArray() {
                return array;
            }
        };
        var finisher = (Function<List<String>, List<String>>)Collectors.<String>toUnmodifiableList().finisher();
        assertThrows(IllegalArgumentException.class, () -> finisher.apply(in));
  }
}