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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  
17  package com.google.common.collect.testing.testers;
18  
19  import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
20  import static com.google.common.collect.testing.features.CollectionSize.ONE;
21  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
22  
23  import com.google.common.annotations.GwtCompatible;
24  import com.google.common.collect.testing.features.CollectionFeature;
25  import com.google.common.collect.testing.features.CollectionSize;
26  
27  /**
28   * A generic JUnit test which tests {@code remove(Object)} operations on a list.
29   * Can't be invoked directly; please see
30   * {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
31   *
32   * @author George van den Driessche
33   */
34  @GwtCompatible
35  public 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", getList().remove(duplicate));
46      assertTrue(
47          "After remove(duplicate), a list should still contain the duplicate element",
48          getList().contains(duplicate));
49      assertFalse(
50          "remove(duplicate) should remove the first instance of the "
51              + "duplicate element in the list",
52          firstIndex == getList().indexOf(duplicate));
53      assertEquals(
54          "remove(present) should decrease the size of a list by one.",
55          initialSize - 1,
56          getList().size());
57    }
58  }