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