AsList.java

/*
 * Copyright (c) 2016, 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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 * questions.
 */

/**
 * @test
 * @bug 8155600
 * @summary Tests for Arrays.asList()
 * @run testng AsList
 */

import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.stream.IntStream;

import org.testng.annotations.Test;
import org.testng.annotations.DataProvider;
import static org.testng.Assert.assertSame;
import static org.testng.Assert.assertTrue;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.fail;

public class AsList {
    /*
     * Iterator contract test
     */
    @Test(dataProvider = "Arrays")
    public void testIterator(Object[] array) {
        Iterator<Object> itr = Arrays.asList(array).iterator();
        for (int i = 0; i < array.length; i++) {
            assertTrue(itr.hasNext());
            assertTrue(itr.hasNext()); // must be idempotent
            assertSame(array[i], itr.next());
            try {
                itr.remove();
                fail("Remove must throw");
            } catch (UnsupportedOperationException ex) {
                // expected
            }
        }
        assertFalse(itr.hasNext());
        for (int i = 0; i < 3; i++) {
            assertFalse(itr.hasNext());
            try {
                itr.next();
                fail("Next succeed when there's no data left");
            } catch (NoSuchElementException ex) {
                // expected
            }
        }
    }

    @DataProvider(name = "Arrays")
    public static Object[][] arrays() {
        Object[][] arrays = {
            { new Object[] { } },
            { new Object[] { 1 } },
            { new Object[] { null } },
            { new Object[] { null, 1 } },
            { new Object[] { 1, null } },
            { new Object[] { null, null } },
            { new Object[] { null, 1, 2 } },
            { new Object[] { 1, null, 2 } },
            { new Object[] { 1, 2, null } },
            { new Object[] { null, null, null } },
            { new Object[] { 1, 2, 3, null, 4 } },
            { new Object[] { "a", "a", "a", "a" } },
            { IntStream.range(0, 100).boxed().toArray() }
        };

        return arrays;
    }
}