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.CollectionSize.ONE;
20import static com.google.common.collect.testing.features.CollectionSize.ZERO;
21import static com.google.common.collect.testing.features.ListFeature.SUPPORTS_REMOVE_WITH_INDEX;
22
23import com.google.common.collect.testing.Helpers;
24import com.google.common.collect.testing.features.CollectionSize;
25import com.google.common.collect.testing.features.ListFeature;
26
27import java.util.List;
28
29/**
30 * A generic JUnit test which tests {@code remove(int)} 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 */
38public class ListRemoveAtIndexTester<E> extends AbstractListTester<E> {
39  @ListFeature.Require(absent = SUPPORTS_REMOVE_WITH_INDEX)
40  @CollectionSize.Require(absent = ZERO)
41  public void testRemoveAtIndex_unsupported() {
42    try {
43      getList().remove(0);
44      fail("remove(i) should throw");
45    } catch (UnsupportedOperationException expected) {
46    }
47    expectUnchanged();
48  }
49
50  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
51  public void testRemoveAtIndex_negative() {
52    try {
53      getList().remove(-1);
54      fail("remove(-1) should throw");
55    } catch (IndexOutOfBoundsException expected) {
56    }
57    expectUnchanged();
58  }
59
60  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
61  public void testRemoveAtIndex_tooLarge() {
62    try {
63      getList().remove(getNumElements());
64      fail("remove(size) should throw");
65    } catch (IndexOutOfBoundsException expected) {
66    }
67    expectUnchanged();
68  }
69
70  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
71  @CollectionSize.Require(absent = ZERO)
72  public void testRemoveAtIndex_first() {
73    runRemoveTest(0);
74  }
75
76  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
77  @CollectionSize.Require(absent = {ZERO, ONE})
78  public void testRemoveAtIndex_middle() {
79    runRemoveTest(getNumElements() / 2);
80  }
81
82  @ListFeature.Require(SUPPORTS_REMOVE_WITH_INDEX)
83  @CollectionSize.Require(absent = ZERO)
84  public void testRemoveAtIndex_last() {
85    runRemoveTest(getNumElements() - 1);
86  }
87
88  private void runRemoveTest(int index) {
89    assertEquals(Platform.format(
90        "remove(%d) should return the element at index %d", index, index),
91        getList().get(index), getList().remove(index));
92    List<E> expected = Helpers.copyToList(createSamplesArray());
93    expected.remove(index);
94    expectContents(expected);
95  }
96}
97