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.ZERO;
22
23import com.google.common.collect.testing.features.CollectionFeature;
24import com.google.common.collect.testing.features.CollectionSize;
25
26/**
27 * A generic JUnit test which tests {@code remove(Object)} operations on a list.
28 * Can't be invoked directly; please see
29 * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
30 *
31 * <p>This class is GWT compatible.
32 *
33 * @author George van den Driessche
34 */
35public class ListRemoveTester<E> extends AbstractListTester<E> {
36  @CollectionFeature.Require(SUPPORTS_REMOVE)
37  @CollectionSize.Require(absent = {ZERO, ONE})
38  public void testRemove_duplicate() {
39    ArrayWithDuplicate<E> arrayAndDuplicate = createArrayWithDuplicateElement();
40    collection = getSubjectGenerator().create(arrayAndDuplicate.elements);
41    E duplicate = arrayAndDuplicate.duplicate;
42
43    int firstIndex = getList().indexOf(duplicate);
44    int initialSize = getList().size();
45    assertTrue("remove(present) should return true",
46        getList().remove(duplicate));
47    assertTrue("After remove(duplicate), a list should still contain "
48        + "the duplicate element", getList().contains(duplicate));
49    assertFalse("remove(duplicate) should remove the first instance of the "
50        + "duplicate element in the list",
51        firstIndex == getList().indexOf(duplicate));
52    assertEquals("remove(present) should decrease the size of a list by one.",
53        initialSize - 1, getList().size());
54  }
55}
56