ListRetainAllTester.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.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;
23
24import com.google.common.annotations.GwtCompatible;
25import com.google.common.collect.testing.MinimalCollection;
26import com.google.common.collect.testing.features.CollectionFeature;
27import com.google.common.collect.testing.features.CollectionSize;
28
29/**
30 * A generic JUnit test which tests {@code retainAll} operations on a list.
31 * Can't be invoked directly; please see
32 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
33 *
34 * <p>This class is GWT compatible.
35 *
36 * @author Chris Povirk
37 */
38@GwtCompatible
39public class ListRetainAllTester<E> extends AbstractListTester<E> {
40  @CollectionFeature.Require(SUPPORTS_REMOVE)
41  @CollectionSize.Require(absent = {ZERO, ONE})
42  public void testRetainAll_duplicatesKept() {
43    E[] array = createSamplesArray();
44    array[1] = samples.e0;
45    collection = getSubjectGenerator().create(array);
46    assertFalse("containsDuplicates.retainAll(superset) should return false",
47        collection.retainAll(MinimalCollection.of(createSamplesArray())));
48    expectContents(array);
49  }
50
51  @SuppressWarnings("unchecked")
52  @CollectionFeature.Require(SUPPORTS_REMOVE)
53  @CollectionSize.Require(SEVERAL)
54  public void testRetainAll_duplicatesRemoved() {
55    E[] array = createSamplesArray();
56    array[1] = samples.e0;
57    collection = getSubjectGenerator().create(array);
58    assertTrue("containsDuplicates.retainAll(subset) should return true",
59        collection.retainAll(MinimalCollection.of(samples.e2)));
60    expectContents(samples.e2);
61  }
62}
63