1/*
2 * Copyright (C) 2013 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15package com.google.common.collect.testing.google;
16
17import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ITERATOR_REMOVE;
18import static com.google.common.collect.testing.features.CollectionSize.ZERO;
19import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
20import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
21import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
22
23import com.google.common.annotations.GwtCompatible;
24import com.google.common.collect.Multimap;
25import com.google.common.collect.testing.features.CollectionFeature;
26import com.google.common.collect.testing.features.CollectionSize;
27import com.google.common.collect.testing.features.MapFeature;
28
29import java.util.Iterator;
30import java.util.Map;
31
32/**
33 * Tester for {@code Multimap.keySet}.
34 *
35 * @author Louis Wasserman
36 */
37@GwtCompatible
38public class MultimapKeySetTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
39  public void testKeySet() {
40    for (Map.Entry<K, V> entry : getSampleElements()) {
41      assertTrue(multimap().keySet().contains(entry.getKey()));
42    }
43  }
44
45  @CollectionSize.Require(absent = ZERO)
46  @MapFeature.Require(ALLOWS_NULL_KEYS)
47  public void testKeySetContainsNullKeyPresent() {
48    initMultimapWithNullKey();
49    assertTrue(multimap().keySet().contains(null));
50  }
51
52  @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
53  public void testKeySetContainsNullKeyAbsent() {
54    assertFalse(multimap().keySet().contains(null));
55  }
56
57  @MapFeature.Require(SUPPORTS_REMOVE)
58  public void testKeySetRemovePropagatesToMultimap() {
59    int key0Count = multimap().get(sampleKeys().e0).size();
60    assertEquals(key0Count > 0, multimap().keySet().remove(sampleKeys().e0));
61    assertEquals(getNumElements() - key0Count, multimap().size());
62    assertGet(sampleKeys().e0);
63  }
64
65  @CollectionSize.Require(absent = ZERO)
66  @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
67  public void testKeySetIteratorRemove() {
68    int key0Count = multimap().get(sampleKeys().e0).size();
69    Iterator<K> keyItr = multimap().keySet().iterator();
70    while (keyItr.hasNext()) {
71      if (keyItr.next().equals(sampleKeys().e0)) {
72        keyItr.remove();
73      }
74    }
75    assertEquals(getNumElements() - key0Count, multimap().size());
76    assertGet(sampleKeys().e0);
77  }
78}
79