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   */
16  
17  package com.google.common.collect.testing.google;
18  
19  import static com.google.common.collect.testing.Helpers.mapEntry;
20  import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
21  import static com.google.common.collect.testing.features.CollectionSize.ZERO;
22  import static com.google.common.collect.testing.features.MapFeature.*;
23  
24  import com.google.common.annotations.GwtCompatible;
25  import com.google.common.collect.Multimap;
26  import com.google.common.collect.testing.features.CollectionSize;
27  import com.google.common.collect.testing.features.MapFeature;
28  
29  import java.util.Collection;
30  import java.util.Map.Entry;
31  
32  /**
33   * Tester for the {@code size} methods of {@code Multimap} and its views.
34   *
35   * @author Louis Wasserman
36   */
37  @GwtCompatible
38  public class MultimapSizeTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
39  
40    public void testSize() {
41      int expectedSize = getNumElements();
42      Multimap<K, V> multimap = multimap();
43      assertEquals(expectedSize, multimap.size());
44  
45      int size = 0;
46      for (Entry<K, V> entry : multimap.entries()) {
47        assertTrue(multimap.containsEntry(entry.getKey(), entry.getValue()));
48        size++;
49      }
50      assertEquals(expectedSize, size);
51  
52      int size2 = 0;
53      for (Entry<K, Collection<V>> entry2 : multimap.asMap().entrySet()) {
54        size2 += entry2.getValue().size();
55      }
56      assertEquals(expectedSize, size2);
57    }
58  
59    @CollectionSize.Require(ZERO)
60    public void testIsEmptyYes() {
61      assertTrue(multimap().isEmpty());
62    }
63  
64    @CollectionSize.Require(absent = ZERO)
65    public void testIsEmptyNo() {
66      assertFalse(multimap().isEmpty());
67    }
68  
69    @CollectionSize.Require(absent = ZERO)
70    @MapFeature.Require(ALLOWS_NULL_KEYS)
71    public void testSizeNullKey() {
72      initMultimapWithNullKey();
73      assertEquals(getNumElements(), multimap().size());
74      assertFalse(multimap().isEmpty());
75    }
76  
77    @CollectionSize.Require(absent = ZERO)
78    @MapFeature.Require(ALLOWS_NULL_VALUES)
79    public void testSizeNullValue() {
80      initMultimapWithNullValue();
81      assertEquals(getNumElements(), multimap().size());
82      assertFalse(multimap().isEmpty());
83    }
84  
85    @CollectionSize.Require(absent = ZERO)
86    @MapFeature.Require({ALLOWS_NULL_KEYS, ALLOWS_NULL_VALUES})
87    public void testSizeNullKeyAndValue() {
88      initMultimapWithNullKeyAndValue();
89      assertEquals(getNumElements(), multimap().size());
90      assertFalse(multimap().isEmpty());
91    }
92  
93    @CollectionSize.Require(SEVERAL)
94    public void testSizeMultipleValues() {
95      resetContainer(
96          mapEntry(sampleKeys().e0, sampleValues().e0),
97          mapEntry(sampleKeys().e0, sampleValues().e1),
98          mapEntry(sampleKeys().e0, sampleValues().e2));
99  
100     assertEquals(3, multimap().size());
101     assertEquals(3, multimap().entries().size());
102     assertEquals(3, multimap().keys().size());
103 
104     assertEquals(1, multimap().keySet().size());
105     assertEquals(1, multimap().asMap().size());
106   }
107 }