MultisetReadsTester.java revision 0888a09821a98ac0680fad765217302858e70fa4 
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.google;
18
19import static com.google.common.collect.testing.features.CollectionSize.ONE;
20import static com.google.common.collect.testing.features.CollectionSize.ZERO;
21
22import com.google.common.annotations.GwtCompatible;
23import com.google.common.collect.HashMultiset;
24import com.google.common.collect.Multiset;
25import com.google.common.collect.Multisets;
26import com.google.common.collect.testing.features.CollectionSize;
27
28/**
29 * A generic JUnit test which tests multiset-specific read operations.
30 * Can't be invoked directly; please see
31 * {@link com.google.common.collect.testing.SetTestSuiteBuilder}.
32 *
33 * @author Jared Levy
34 */
35@GwtCompatible
36public class MultisetReadsTester<E> extends AbstractMultisetTester<E> {
37
38  @CollectionSize.Require(absent = ZERO)
39  public void testElementSet_contains() {
40    assertTrue("multiset.elementSet().contains(present) returned false",
41        getMultiset().elementSet().contains(samples.e0));
42  }
43
44  @CollectionSize.Require(absent = ZERO)
45  public void testEntrySet_contains() {
46    assertTrue("multiset.entrySet() didn't contain [present, 1]",
47        getMultiset().entrySet().contains(
48            Multisets.immutableEntry(samples.e0, 1)));
49  }
50
51  public void testEntrySet_contains_count0() {
52    assertFalse("multiset.entrySet() contains [missing, 0]",
53        getMultiset().entrySet().contains(
54            Multisets.immutableEntry(samples.e3, 0)));
55  }
56
57  public void testEntrySet_contains_nonentry() {
58    assertFalse("multiset.entrySet() contains a non-entry",
59        getMultiset().entrySet().contains(samples.e0));
60  }
61
62  public void testEntrySet_twice() {
63    assertEquals("calling multiset.entrySet() twice returned unequal sets",
64        getMultiset().entrySet(), getMultiset().entrySet());
65  }
66
67  @CollectionSize.Require(ZERO)
68  public void testEntrySet_hashCode_size0() {
69    assertEquals("multiset.entrySet() has incorrect hash code",
70        0, getMultiset().entrySet().hashCode());
71  }
72
73  @CollectionSize.Require(ONE)
74  public void testEntrySet_hashCode_size1() {
75    assertEquals("multiset.entrySet() has incorrect hash code",
76        1 ^ samples.e0.hashCode(), getMultiset().entrySet().hashCode());
77  }
78
79  public void testEquals_yes() {
80    assertTrue("multiset doesn't equal a multiset with the same elements",
81        getMultiset().equals(HashMultiset.create(getSampleElements())));
82  }
83
84  public void testEquals_differentSize() {
85    Multiset<E> other = HashMultiset.create(getSampleElements());
86    other.add(samples.e0);
87    assertFalse("multiset equals a multiset with a different size",
88        getMultiset().equals(other));
89  }
90
91  @CollectionSize.Require(absent = ZERO)
92  public void testEquals_differentElements() {
93    Multiset<E> other = HashMultiset.create(getSampleElements());
94    other.remove(samples.e0);
95    other.add(samples.e3);
96    assertFalse("multiset equals a multiset with different elements",
97        getMultiset().equals(other));
98  }
99
100  @CollectionSize.Require(ZERO)
101  public void testHashCode_size0() {
102    assertEquals("multiset has incorrect hash code",
103        0, getMultiset().hashCode());
104  }
105
106  @CollectionSize.Require(ONE)
107  public void testHashCode_size1() {
108    assertEquals("multiset has incorrect hash code",
109        1 ^ samples.e0.hashCode(), getMultiset().hashCode());
110  }
111}
112