001/*
002 * Copyright (C) 2013 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.google;
018
019import static com.google.common.collect.testing.Helpers.assertEmpty;
020import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ADD;
021import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_REMOVE;
022import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
023import static com.google.common.collect.testing.features.CollectionSize.ZERO;
024
025import com.google.common.annotations.GwtCompatible;
026import com.google.common.annotations.GwtIncompatible;
027import com.google.common.annotations.J2ktIncompatible;
028import com.google.common.collect.testing.Helpers;
029import com.google.common.collect.testing.features.CollectionFeature;
030import com.google.common.collect.testing.features.CollectionSize;
031import java.lang.reflect.Method;
032import java.util.Arrays;
033import java.util.Collections;
034import java.util.List;
035import java.util.Set;
036import org.junit.Ignore;
037
038/**
039 * Tests for {@code Multiset.elementSet()} not covered by the derived {@code SetTestSuiteBuilder}.
040 *
041 * @author Louis Wasserman
042 */
043@GwtCompatible
044@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
045public class MultisetElementSetTester<E> extends AbstractMultisetTester<E> {
046  @CollectionFeature.Require(SUPPORTS_ADD)
047  public void testElementSetReflectsAddAbsent() {
048    Set<E> elementSet = getMultiset().elementSet();
049    assertFalse(elementSet.contains(e3()));
050    getMultiset().add(e3(), 4);
051    assertTrue(elementSet.contains(e3()));
052  }
053
054  @CollectionSize.Require(absent = ZERO)
055  @CollectionFeature.Require(SUPPORTS_REMOVE)
056  public void testElementSetReflectsRemove() {
057    Set<E> elementSet = getMultiset().elementSet();
058    assertTrue(elementSet.contains(e0()));
059    getMultiset().removeAll(Collections.singleton(e0()));
060    assertFalse(elementSet.contains(e0()));
061  }
062
063  @CollectionSize.Require(absent = ZERO)
064  @CollectionFeature.Require(SUPPORTS_REMOVE)
065  public void testElementSetRemovePropagatesToMultiset() {
066    Set<E> elementSet = getMultiset().elementSet();
067    int size = getNumElements();
068    int expectedSize = size - getMultiset().count(e0());
069    assertTrue(elementSet.remove(e0()));
070    assertFalse(getMultiset().contains(e0()));
071    assertEquals(expectedSize, getMultiset().size());
072  }
073
074  @CollectionSize.Require(SEVERAL)
075  @CollectionFeature.Require(SUPPORTS_REMOVE)
076  public void testElementSetRemoveDuplicatePropagatesToMultiset() {
077    initThreeCopies();
078    int size = getNumElements();
079    int expectedSize = size - getMultiset().count(e0());
080    Set<E> elementSet = getMultiset().elementSet();
081    assertTrue(elementSet.remove(e0()));
082    assertEmpty(getMultiset());
083    assertEquals(expectedSize, getMultiset().size());
084  }
085
086  @CollectionFeature.Require(SUPPORTS_REMOVE)
087  public void testElementSetRemoveAbsent() {
088    Set<E> elementSet = getMultiset().elementSet();
089    assertFalse(elementSet.remove(e3()));
090    expectUnchanged();
091  }
092
093  @CollectionFeature.Require(SUPPORTS_REMOVE)
094  public void testElementSetClear() {
095    getMultiset().elementSet().clear();
096    assertEmpty(getMultiset());
097  }
098
099  /**
100   * Returns {@link Method} instances for the read tests that assume multisets support duplicates so
101   * that the test of {@code Multisets.forSet()} can suppress them.
102   */
103  @J2ktIncompatible
104  @GwtIncompatible // reflection
105  public static List<Method> getElementSetDuplicateInitializingMethods() {
106    return Arrays.asList(
107        Helpers.getMethod(
108            MultisetElementSetTester.class, "testElementSetRemoveDuplicatePropagatesToMultiset"));
109  }
110}