MultimapGetTester.java revision 0888a09821a98ac0680fad765217302858e70fa4 
1/*
2 * Copyright (C) 2012 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 */
16package com.google.common.collect.testing.google;
17
18import static com.google.common.collect.testing.Helpers.assertContentsAnyOrder;
19import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
20import static com.google.common.collect.testing.features.CollectionSize.ZERO;
21import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
22import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
23import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_VALUES;
24import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_PUT;
25import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
26import static org.truth0.Truth.ASSERT;
27
28import com.google.common.annotations.GwtCompatible;
29import com.google.common.collect.Multimap;
30import com.google.common.collect.testing.Helpers;
31import com.google.common.collect.testing.features.CollectionSize;
32import com.google.common.collect.testing.features.MapFeature;
33
34import java.util.Collection;
35import java.util.Collections;
36
37/**
38 * Tests for {@link Multimap#get(Object)}.
39 *
40 * @author Louis Wasserman
41 */
42@GwtCompatible
43public class MultimapGetTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
44  public void testGetEmpty() {
45    Collection<V> result = multimap().get(sampleKeys().e3);
46    assertTrue(result.isEmpty());
47    assertEquals(0, result.size());
48  }
49
50  @CollectionSize.Require(absent = ZERO)
51  public void testGetNonEmpty() {
52    Collection<V> result = multimap().get(sampleKeys().e0);
53    assertFalse(result.isEmpty());
54    assertContentsAnyOrder(result, sampleValues().e0);
55  }
56
57  @CollectionSize.Require(SEVERAL)
58  public void testGetMultiple() {
59    resetContainer(
60        Helpers.mapEntry(sampleKeys().e0, sampleValues().e0),
61        Helpers.mapEntry(sampleKeys().e0, sampleValues().e1),
62        Helpers.mapEntry(sampleKeys().e0, sampleValues().e2));
63    assertGet(sampleKeys().e0,
64        sampleValues().e0,
65        sampleValues().e1,
66        sampleValues().e2);
67  }
68
69  public void testGetAbsentKey() {
70    assertGet(sampleKeys().e4);
71  }
72
73  @CollectionSize.Require(SEVERAL)
74  @MapFeature.Require(SUPPORTS_REMOVE)
75  public void testPropagatesRemoveToMultimap() {
76    resetContainer(
77        Helpers.mapEntry(sampleKeys().e0, sampleValues().e0),
78        Helpers.mapEntry(sampleKeys().e0, sampleValues().e3),
79        Helpers.mapEntry(sampleKeys().e0, sampleValues().e2));
80    Collection<V> result = multimap().get(sampleKeys().e0);
81    assertTrue(result.remove(sampleValues().e0));
82    assertFalse(multimap().containsEntry(sampleKeys().e0, sampleValues().e0));
83    assertEquals(2, multimap().size());
84  }
85
86  @CollectionSize.Require(absent = ZERO)
87  @MapFeature.Require(SUPPORTS_REMOVE)
88  public void testPropagatesRemoveLastElementToMultimap() {
89    Collection<V> result = multimap().get(sampleKeys().e0);
90    assertTrue(result.remove(sampleValues().e0));
91    assertGet(sampleKeys().e0);
92  }
93
94  @MapFeature.Require(SUPPORTS_PUT)
95  public void testPropagatesAddToMultimap() {
96    Collection<V> result = multimap().get(sampleKeys().e0);
97    assertTrue(result.add(sampleValues().e3));
98    assertTrue(multimap().containsKey(sampleKeys().e0));
99    assertEquals(getNumElements() + 1, multimap().size());
100    assertTrue(multimap().containsEntry(sampleKeys().e0, sampleValues().e3));
101  }
102
103  @MapFeature.Require(SUPPORTS_PUT)
104  public void testPropagatesAddAllToMultimap() {
105    Collection<V> result = multimap().get(sampleKeys().e0);
106    assertTrue(result.addAll(Collections.singletonList(sampleValues().e3)));
107    assertTrue(multimap().containsKey(sampleKeys().e0));
108    assertEquals(getNumElements() + 1, multimap().size());
109    assertTrue(multimap().containsEntry(sampleKeys().e0, sampleValues().e3));
110  }
111
112  @CollectionSize.Require(absent = ZERO)
113  @MapFeature.Require({ SUPPORTS_REMOVE, SUPPORTS_PUT })
114  public void testPropagatesRemoveLastThenAddToMultimap() {
115    int oldSize = getNumElements();
116
117    K k0 = sampleKeys().e0;
118    V v0 = sampleValues().e0;
119
120    Collection<V> result = multimap().get(k0);
121    assertTrue(result.remove(v0));
122
123    assertFalse(multimap().containsKey(k0));
124    assertFalse(multimap().containsEntry(k0, v0));
125    ASSERT.that(result).isEmpty();
126
127    V v1 = sampleValues().e1;
128    V v2 = sampleValues().e2;
129
130    assertTrue(result.add(v1));
131    assertTrue(result.add(v2));
132
133    ASSERT.that(result).has().exactly(v1, v2);
134    ASSERT.that(multimap().get(k0)).has().exactly(v1, v2);
135    assertTrue(multimap().containsKey(k0));
136    assertFalse(multimap().containsEntry(k0, v0));
137    assertTrue(multimap().containsEntry(k0, v2));
138    assertEquals(oldSize + 1, multimap().size());
139  }
140
141  @MapFeature.Require(ALLOWS_NULL_KEYS)
142  @CollectionSize.Require(absent = ZERO)
143  public void testGetNullPresent() {
144    initMultimapWithNullKey();
145    ASSERT.that(multimap().get(null)).has().item(getValueForNullKey());
146  }
147
148  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
149  public void testGetNullAbsent() {
150    ASSERT.that(multimap().get(null)).isEmpty();
151  }
152
153  @MapFeature.Require(absent = ALLOWS_NULL_KEY_QUERIES)
154  public void testGetNullForbidden() {
155    try {
156      multimap().get(null);
157      fail("Expected NullPointerException");
158    } catch (NullPointerException expected) {
159      // success
160    }
161  }
162
163  @MapFeature.Require(ALLOWS_NULL_VALUES)
164  @CollectionSize.Require(absent = ZERO)
165  public void testGetWithNullValue() {
166    initMultimapWithNullValue();
167    ASSERT.that(multimap().get(getKeyForNullValue()))
168        .has().item(null);
169  }
170}
171