387 lines
13 KiB
Java
387 lines
13 KiB
Java
/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.io.ObjectOutputStream;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import java.util.ListIterator;
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import java.util.stream.Stream;
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import org.testng.annotations.DataProvider;
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import org.testng.annotations.Test;
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import static java.util.Arrays.asList;
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import static org.testng.Assert.assertEquals;
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import static org.testng.Assert.assertFalse;
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import static org.testng.Assert.assertNotEquals;
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import static org.testng.Assert.assertNotSame;
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import static org.testng.Assert.assertSame;
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import static org.testng.Assert.assertTrue;
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import static org.testng.Assert.fail;
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/*
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* @test
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* @bug 8048330 8203184
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* @summary Test convenience static factory methods on List.
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* @run testng ListFactories
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*/
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public class ListFactories {
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static final int NUM_STRINGS = 20; // should be larger than the largest fixed-arg overload
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static final String[] stringArray;
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static {
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String[] sa = new String[NUM_STRINGS];
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for (int i = 0; i < NUM_STRINGS; i++) {
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sa[i] = String.valueOf((char)('a' + i));
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}
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stringArray = sa;
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}
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// returns array of [actual, expected]
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static Object[] a(List<String> act, List<String> exp) {
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return new Object[] { act, exp };
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}
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@DataProvider(name="empty")
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public Iterator<Object[]> empty() {
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return Collections.singletonList(
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a(List.of(), asList())
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).iterator();
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}
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@DataProvider(name="nonempty")
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public Iterator<Object[]> nonempty() {
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return asList(
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a(List.of("a"),
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asList("a")),
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a(List.of("a", "b"),
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asList("a", "b")),
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a(List.of("a", "b", "c"),
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asList("a", "b", "c")),
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a(List.of("a", "b", "c", "d"),
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asList("a", "b", "c", "d")),
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a(List.of("a", "b", "c", "d", "e"),
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asList("a", "b", "c", "d", "e")),
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a(List.of("a", "b", "c", "d", "e", "f"),
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asList("a", "b", "c", "d", "e", "f")),
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a(List.of("a", "b", "c", "d", "e", "f", "g"),
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asList("a", "b", "c", "d", "e", "f", "g")),
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a(List.of("a", "b", "c", "d", "e", "f", "g", "h"),
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asList("a", "b", "c", "d", "e", "f", "g", "h")),
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a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i"),
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asList("a", "b", "c", "d", "e", "f", "g", "h", "i")),
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a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", "j"),
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asList("a", "b", "c", "d", "e", "f", "g", "h", "i", "j")),
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a(List.of(stringArray),
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asList(stringArray))
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).iterator();
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}
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@DataProvider(name="sublists")
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public Iterator<Object[]> sublists() {
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return asList(
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a(List.<String>of().subList(0,0),
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asList()),
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a(List.of("a").subList(0,0),
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asList("a").subList(0,0)),
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a(List.of("a", "b").subList(0,1),
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asList("a", "b").subList(0,1)),
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a(List.of("a", "b", "c").subList(1,3),
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asList("a", "b", "c").subList(1,3)),
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a(List.of("a", "b", "c", "d").subList(0,4),
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asList("a", "b", "c", "d").subList(0,4)),
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a(List.of("a", "b", "c", "d", "e").subList(0,3),
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asList("a", "b", "c", "d", "e").subList(0,3)),
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a(List.of("a", "b", "c", "d", "e", "f").subList(3, 5),
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asList("a", "b", "c", "d", "e", "f").subList(3, 5)),
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a(List.of("a", "b", "c", "d", "e", "f", "g").subList(0, 7),
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asList("a", "b", "c", "d", "e", "f", "g").subList(0, 7)),
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a(List.of("a", "b", "c", "d", "e", "f", "g", "h").subList(0, 0),
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asList("a", "b", "c", "d", "e", "f", "g", "h").subList(0, 0)),
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a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i").subList(4, 5),
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asList("a", "b", "c", "d", "e", "f", "g", "h", "i").subList(4, 5)),
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a(List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", "j").subList(1,10),
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asList("a", "b", "c", "d", "e", "f", "g", "h", "i", "j").subList(1,10)),
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a(List.of(stringArray).subList(5, NUM_STRINGS),
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asList(Arrays.copyOfRange(stringArray, 5, NUM_STRINGS)))
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).iterator();
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}
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@DataProvider(name="all")
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public Iterator<Object[]> all() {
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List<Object[]> all = new ArrayList<>();
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empty().forEachRemaining(all::add);
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nonempty().forEachRemaining(all::add);
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sublists().forEachRemaining(all::add);
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return all.iterator();
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}
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@DataProvider(name="nonsublists")
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public Iterator<Object[]> nonsublists() {
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List<Object[]> all = new ArrayList<>();
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empty().forEachRemaining(all::add);
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nonempty().forEachRemaining(all::add);
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return all.iterator();
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}
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@Test(dataProvider="all", expectedExceptions=UnsupportedOperationException.class)
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public void cannotAddLast(List<String> act, List<String> exp) {
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act.add("x");
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}
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@Test(dataProvider="all", expectedExceptions=UnsupportedOperationException.class)
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public void cannotAddFirst(List<String> act, List<String> exp) {
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act.add(0, "x");
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}
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@Test(dataProvider="nonempty", expectedExceptions=UnsupportedOperationException.class)
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public void cannotRemove(List<String> act, List<String> exp) {
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act.remove(0);
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}
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@Test(dataProvider="nonempty", expectedExceptions=UnsupportedOperationException.class)
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public void cannotSet(List<String> act, List<String> exp) {
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act.set(0, "x");
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}
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@Test(dataProvider="all")
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public void contentsMatch(List<String> act, List<String> exp) {
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assertEquals(act, exp);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed1() {
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List.of((Object)null); // force one-arg overload
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed2a() {
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List.of("a", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed2b() {
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List.of(null, "b");
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed3() {
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List.of("a", "b", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed4() {
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List.of("a", "b", "c", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed5() {
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List.of("a", "b", "c", "d", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed6() {
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List.of("a", "b", "c", "d", "e", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed7() {
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List.of("a", "b", "c", "d", "e", "f", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed8() {
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List.of("a", "b", "c", "d", "e", "f", "g", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed9() {
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List.of("a", "b", "c", "d", "e", "f", "g", "h", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowed10() {
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List.of("a", "b", "c", "d", "e", "f", "g", "h", "i", null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullDisallowedN() {
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String[] array = stringArray.clone();
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array[0] = null;
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List.of(array);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void nullArrayDisallowed() {
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List.of((Object[])null);
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}
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@Test
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public void ensureArrayCannotModifyList() {
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String[] array = stringArray.clone();
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List<String> list = List.of(array);
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array[0] = "xyzzy";
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assertEquals(list, Arrays.asList(stringArray));
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}
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@Test(dataProvider="all", expectedExceptions=NullPointerException.class)
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public void containsNullShouldThrowNPE(List<String> act, List<String> exp) {
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act.contains(null);
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}
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@Test(dataProvider="all", expectedExceptions=NullPointerException.class)
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public void indexOfNullShouldThrowNPE(List<String> act, List<String> exp) {
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act.indexOf(null);
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}
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@Test(dataProvider="all", expectedExceptions=NullPointerException.class)
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public void lastIndexOfNullShouldThrowNPE(List<String> act, List<String> exp) {
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act.lastIndexOf(null);
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}
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// List.of().subList views should not be Serializable
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@Test(dataProvider="sublists")
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public void isNotSerializable(List<String> act, List<String> exp) {
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assertFalse(act instanceof Serializable);
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}
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// ... but List.of() should be
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@Test(dataProvider="nonsublists")
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public void serialEquality(List<String> act, List<String> exp) {
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// assume that act.equals(exp) tested elsewhere
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List<String> copy = serialClone(act);
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assertEquals(act, copy);
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assertEquals(copy, exp);
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}
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@SuppressWarnings("unchecked")
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static <T> T serialClone(T obj) {
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try {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
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oos.writeObject(obj);
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}
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ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
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ObjectInputStream ois = new ObjectInputStream(bais);
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return (T) ois.readObject();
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} catch (IOException | ClassNotFoundException e) {
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throw new AssertionError(e);
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}
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}
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List<Integer> genList() {
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return new ArrayList<>(Arrays.asList(1, 2, 3));
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}
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@Test
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public void copyOfResultsEqual() {
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List<Integer> orig = genList();
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List<Integer> copy = List.copyOf(orig);
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assertEquals(orig, copy);
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assertEquals(copy, orig);
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}
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@Test
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public void copyOfModifiedUnequal() {
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List<Integer> orig = genList();
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List<Integer> copy = List.copyOf(orig);
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orig.add(4);
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assertNotEquals(orig, copy);
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assertNotEquals(copy, orig);
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}
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@Test
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public void copyOfIdentity() {
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List<Integer> orig = genList();
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List<Integer> copy1 = List.copyOf(orig);
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List<Integer> copy2 = List.copyOf(copy1);
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assertNotSame(orig, copy1);
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assertSame(copy1, copy2);
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}
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@Test
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public void copyOfSubList() {
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List<Integer> orig = List.of(0, 1, 2, 3);
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List<Integer> sub = orig.subList(0, 3);
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List<Integer> copy = List.copyOf(sub);
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assertNotSame(sub, copy);
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}
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@Test
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public void copyOfSubSubList() {
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List<Integer> orig = List.of(0, 1, 2, 3);
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List<Integer> sub = orig.subList(0, 3).subList(0, 2);
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List<Integer> copy = List.copyOf(sub);
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assertNotSame(sub, copy);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void copyOfRejectsNullCollection() {
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List<Integer> list = List.copyOf(null);
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void copyOfRejectsNullElements() {
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List<Integer> list = List.copyOf(Arrays.asList(1, null, 3));
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}
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@Test(expectedExceptions=NullPointerException.class)
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public void copyOfRejectsNullElements2() {
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List<String> list = List.copyOf(Stream.of("a", null, "c").toList());
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}
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@Test
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public void copyOfCopiesNullAllowingList() {
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List<String> orig = Stream.of("a", "b", "c").toList();
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List<String> copy = List.copyOf(orig);
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assertNotSame(orig, copy);
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}
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@Test
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public void iteratorShouldNotBeListIterator() {
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List<Integer> list = List.of(1, 2, 3, 4, 5);
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Iterator<Integer> it = list.iterator();
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it.next();
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try {
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((ListIterator<Integer>) it).previous();
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fail("ListIterator operation succeeded on Iterator");
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} catch (ClassCastException|UnsupportedOperationException ignore) { }
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}
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}
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