001/*
002 * Copyright (C) 2008 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.testers;
018
019import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
020import static com.google.common.collect.testing.features.CollectionSize.ONE;
021import static com.google.common.collect.testing.features.CollectionSize.ZERO;
022
023import com.google.common.annotations.GwtCompatible;
024import com.google.common.collect.testing.features.CollectionFeature;
025import com.google.common.collect.testing.features.CollectionSize;
026
027/**
028 * A generic JUnit test which tests {@code remove(Object)} operations on a list. Can't be invoked
029 * directly; please see {@link com.google.common.collect.testing.ListTestSuiteBuilder}.
030 *
031 * @author George van den Driessche
032 */
033@GwtCompatible
034public class ListRemoveTester<E> extends AbstractListTester<E> {
035  @CollectionFeature.Require(SUPPORTS_REMOVE)
036  @CollectionSize.Require(absent = {ZERO, ONE})
037  public void testRemove_duplicate() {
038    ArrayWithDuplicate<E> arrayAndDuplicate = createArrayWithDuplicateElement();
039    collection = getSubjectGenerator().create(arrayAndDuplicate.elements);
040    E duplicate = arrayAndDuplicate.duplicate;
041
042    int firstIndex = getList().indexOf(duplicate);
043    int initialSize = getList().size();
044    assertTrue("remove(present) should return true", getList().remove(duplicate));
045    assertTrue(
046        "After remove(duplicate), a list should still contain the duplicate element",
047        getList().contains(duplicate));
048    assertFalse(
049        "remove(duplicate) should remove the first instance of the "
050            + "duplicate element in the list",
051        firstIndex == getList().indexOf(duplicate));
052    assertEquals(
053        "remove(present) should decrease the size of a list by one.",
054        initialSize - 1,
055        getList().size());
056  }
057}