1/*
2 * Copyright (C) 2007 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.CollectionFeature.ALLOWS_NULL_VALUES;
20import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
21import static com.google.common.collect.testing.features.CollectionSize.ZERO;
22
23import com.google.common.annotations.GwtCompatible;
24import com.google.common.collect.testing.Helpers;
25import com.google.common.collect.testing.features.CollectionFeature;
26import com.google.common.collect.testing.features.CollectionSize;
27
28import java.util.List;
29
30/**
31 * A generic JUnit test which tests {@code add(Object)} operations on a list.
32 * Can't be invoked directly; please see
33 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
34 *
35 * @author Chris Povirk
36 */
37@SuppressWarnings("unchecked") // too many "unchecked generic array creations"
38@GwtCompatible(emulated = true)
39public class ListAddTester<E> extends AbstractListTester<E> {
40  @CollectionFeature.Require(SUPPORTS_ADD)
41  @CollectionSize.Require(absent = ZERO)
42  public void testAdd_supportedPresent() {
43    assertTrue("add(present) should return true", getList().add(samples.e0));
44    expectAdded(samples.e0);
45  }
46
47  @CollectionFeature.Require(absent = SUPPORTS_ADD)
48  @CollectionSize.Require(absent = ZERO)
49  /*
50   * absent = ZERO isn't required, since unmodList.add() must
51   * throw regardless, but it keeps the method name accurate.
52   */
53  public void testAdd_unsupportedPresent() {
54    try {
55      getList().add(samples.e0);
56      fail("add(present) should throw");
57    } catch (UnsupportedOperationException expected) {
58    }
59  }
60
61  @CollectionFeature.Require(value = {SUPPORTS_ADD, ALLOWS_NULL_VALUES})
62  @CollectionSize.Require(absent = ZERO)
63  public void testAdd_supportedNullPresent() {
64    E[] array = createArrayWithNullElement();
65    collection = getSubjectGenerator().create(array);
66    assertTrue("add(nullPresent) should return true", getList().add(null));
67
68    List<E> expected = Helpers.copyToList(array);
69    expected.add(null);
70    expectContents(expected);
71  }
72}
73
74