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.collect.testing.features.CollectionSize;
22
23import java.util.Arrays;
24
25/**
26 * A generic JUnit test which tests {@code toArray()} operations on a list.
27 * Can't be invoked directly; please see
28 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
29 *
30 * <p>This class is GWT compatible.
31 *
32 * @author Chris Povirk
33 */
34public class ListToArrayTester<E> extends AbstractListTester<E> {
35  // CollectionToArrayTester tests everything except ordering.
36
37  public void testToArray_noArg() {
38    Object[] actual = getList().toArray();
39    assertArrayEquals("toArray() order should match list",
40        createSamplesArray(), actual);
41  }
42
43  @CollectionSize.Require(absent = ZERO)
44  public void testToArray_tooSmall() {
45    Object[] actual = getList().toArray(new Object[0]);
46    assertArrayEquals("toArray(tooSmall) order should match list",
47        createSamplesArray(), actual);
48  }
49
50  public void testToArray_largeEnough() {
51    Object[] actual = getList().toArray(new Object[getNumElements()]);
52    assertArrayEquals("toArray(largeEnough) order should match list",
53        createSamplesArray(), actual);
54  }
55
56  private static void assertArrayEquals(String message, Object[] expected,
57      Object[] actual) {
58    assertEquals(message, Arrays.asList(expected), Arrays.asList(actual));
59  }
60}
61