ListToArrayTester.java revision 7dd252788645e940eada959bdde927426e2531c9 
1/*
2 * Copyright (C) 2008 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect.testing.testers;
18
19import static com.google.common.collect.testing.features.CollectionSize.ZERO;
20
21import com.google.common.annotations.GwtCompatible;
22import com.google.common.collect.testing.features.CollectionSize;
23
24import java.util.Arrays;
25
26/**
27 * A generic JUnit test which tests {@code toArray()} operations on a list.
28 * Can't be invoked directly; please see
29 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
30 *
31 * <p>This class is GWT compatible.
32 *
33 * @author Chris Povirk
34 */
35@GwtCompatible
36public class ListToArrayTester<E> extends AbstractListTester<E> {
37  // CollectionToArrayTester tests everything except ordering.
38
39  public void testToArray_noArg() {
40    Object[] actual = getList().toArray();
41    assertArrayEquals("toArray() order should match list",
42        createOrderedArray(), actual);
43  }
44
45  @CollectionSize.Require(absent = ZERO)
46  public void testToArray_tooSmall() {
47    Object[] actual = getList().toArray(new Object[0]);
48    assertArrayEquals("toArray(tooSmall) order should match list",
49        createOrderedArray(), actual);
50  }
51
52  public void testToArray_largeEnough() {
53    Object[] actual = getList().toArray(new Object[getNumElements()]);
54    assertArrayEquals("toArray(largeEnough) order should match list",
55        createOrderedArray(), actual);
56  }
57
58  private static void assertArrayEquals(String message, Object[] expected,
59      Object[] actual) {
60    assertEquals(message, Arrays.asList(expected), Arrays.asList(actual));
61  }
62}
63