001/*
002 * Copyright (C) 2013 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
005 * in compliance with the License. You may obtain a copy of the License at
006 *
007 * http://www.apache.org/licenses/LICENSE-2.0
008 *
009 * Unless required by applicable law or agreed to in writing, software distributed under the License
010 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
011 * or implied. See the License for the specific language governing permissions and limitations under
012 * the License.
013 */
014
015package com.google.common.collect.testing.google;
016
017import static com.google.common.collect.testing.features.CollectionFeature.ALLOWS_NULL_VALUES;
018import static com.google.common.collect.testing.features.CollectionSize.ZERO;
019
020import com.google.common.annotations.GwtCompatible;
021import com.google.common.collect.testing.features.CollectionFeature;
022import com.google.common.collect.testing.features.CollectionSize;
023import com.google.common.testing.EqualsTester;
024
025/**
026 * Tests for {@code Multiset.equals} and {@code Multiset.hashCode}.
027 *
028 * @author Louis Wasserman
029 */
030@GwtCompatible
031public class MultisetEqualsTester<E> extends AbstractMultisetTester<E> {
032  public void testEqualsSameContents() {
033    new EqualsTester()
034        .addEqualityGroup(
035            getMultiset(), getSubjectGenerator().create(getSampleElements().toArray()))
036        .testEquals();
037  }
038
039  @CollectionSize.Require(absent = ZERO)
040  public void testNotEqualsEmpty() {
041    new EqualsTester()
042        .addEqualityGroup(getMultiset())
043        .addEqualityGroup(getSubjectGenerator().create())
044        .testEquals();
045  }
046
047  public void testHashCodeMatchesEntrySet() {
048    assertEquals(getMultiset().entrySet().hashCode(), getMultiset().hashCode());
049  }
050
051  @CollectionSize.Require(absent = ZERO)
052  @CollectionFeature.Require(ALLOWS_NULL_VALUES)
053  public void testEqualsMultisetWithNullValue() {
054    new EqualsTester()
055        .addEqualityGroup(getMultiset())
056        .addEqualityGroup(
057            getSubjectGenerator().create(createArrayWithNullElement()),
058            getSubjectGenerator().create(createArrayWithNullElement()))
059        .testEquals();
060  }
061}