ListRetainAllTester.java revision 3ecfa412eddc4b084663f38d562537b86b9734d5 
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.CollectionFeature.SUPPORTS_REMOVE;
20import static com.google.common.collect.testing.features.CollectionSize.ONE;
21import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
22import static com.google.common.collect.testing.features.CollectionSize.ZERO;
23import static com.google.common.truth.Truth.assertThat;
24
25import com.google.common.annotations.GwtCompatible;
26import com.google.common.collect.testing.MinimalCollection;
27import com.google.common.collect.testing.features.CollectionFeature;
28import com.google.common.collect.testing.features.CollectionSize;
29
30import java.util.Arrays;
31
32/**
33 * A generic JUnit test which tests {@code retainAll} operations on a list.
34 * Can't be invoked directly; please see
35 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
36 *
37 * @author Chris Povirk
38 */
39@GwtCompatible
40public class ListRetainAllTester<E> extends AbstractListTester<E> {
41  @CollectionFeature.Require(SUPPORTS_REMOVE)
42  @CollectionSize.Require(absent = {ZERO, ONE})
43  public void testRetainAll_duplicatesKept() {
44    E[] array = createSamplesArray();
45    array[1] = samples.e0;
46    collection = getSubjectGenerator().create(array);
47    assertFalse("containsDuplicates.retainAll(superset) should return false",
48        collection.retainAll(MinimalCollection.of(createSamplesArray())));
49    expectContents(array);
50  }
51
52  @SuppressWarnings("unchecked")
53  @CollectionFeature.Require(SUPPORTS_REMOVE)
54  @CollectionSize.Require(SEVERAL)
55  public void testRetainAll_duplicatesRemoved() {
56    E[] array = createSamplesArray();
57    array[1] = samples.e0;
58    collection = getSubjectGenerator().create(array);
59    assertTrue("containsDuplicates.retainAll(subset) should return true",
60        collection.retainAll(MinimalCollection.of(samples.e2)));
61    expectContents(samples.e2);
62  }
63
64  @SuppressWarnings("unchecked")
65  @CollectionFeature.Require(SUPPORTS_REMOVE)
66  @CollectionSize.Require(SEVERAL)
67  public void testRetainAll_countIgnored() {
68    resetContainer(getSubjectGenerator().create(samples.e0, samples.e2, samples.e1, samples.e0));
69    assertTrue(getList().retainAll(Arrays.asList(samples.e0, samples.e1)));
70    assertThat(getList()).has().exactly(samples.e0, samples.e1, samples.e0).inOrder();
71  }
72}
73