001/*
002 * Copyright (C) 2013 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.collect.testing.google;
018
019import static com.google.common.collect.testing.Helpers.assertEmpty;
020import static com.google.common.collect.testing.features.CollectionSize.ZERO;
021import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
022import static com.google.common.collect.testing.google.GoogleHelpers.assertEmpty;
023import static com.google.common.collect.testing.google.ReflectionFreeAssertThrows.assertThrows;
024
025import com.google.common.annotations.GwtCompatible;
026import com.google.common.collect.Multimap;
027import com.google.common.collect.testing.features.CollectionSize;
028import com.google.common.collect.testing.features.MapFeature;
029import java.util.Collection;
030import java.util.Map;
031import java.util.Map.Entry;
032import org.junit.Ignore;
033
034/**
035 * Tests for {@link Multimap#clear()}.
036 *
037 * @author Louis Wasserman
038 */
039@GwtCompatible
040@Ignore("test runners must not instantiate and run this directly, only via suites we build")
041// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
042@SuppressWarnings("JUnit4ClassUsedInJUnit3")
043public class MultimapClearTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
044  @CollectionSize.Require(absent = ZERO)
045  @MapFeature.Require(absent = SUPPORTS_REMOVE)
046  public void testClearUnsupported() {
047    assertThrows(UnsupportedOperationException.class, () -> multimap().clear());
048  }
049
050  private void assertCleared() {
051    assertEquals(0, multimap().size());
052    assertEmpty(multimap());
053    assertEquals(multimap(), getSubjectGenerator().create());
054    assertEmpty(multimap().entries());
055    assertEmpty(multimap().asMap());
056    assertEmpty(multimap().keySet());
057    assertEmpty(multimap().keys());
058    assertEmpty(multimap().values());
059    for (K key : sampleKeys()) {
060      assertGet(key);
061    }
062  }
063
064  @MapFeature.Require(SUPPORTS_REMOVE)
065  public void testClear() {
066    multimap().clear();
067    assertCleared();
068  }
069
070  @MapFeature.Require(SUPPORTS_REMOVE)
071  public void testClearThroughEntries() {
072    multimap().entries().clear();
073    assertCleared();
074  }
075
076  @MapFeature.Require(SUPPORTS_REMOVE)
077  public void testClearThroughAsMap() {
078    multimap().asMap().clear();
079    assertCleared();
080  }
081
082  @MapFeature.Require(SUPPORTS_REMOVE)
083  public void testClearThroughKeySet() {
084    multimap().keySet().clear();
085    assertCleared();
086  }
087
088  @MapFeature.Require(SUPPORTS_REMOVE)
089  public void testClearThroughKeys() {
090    multimap().keys().clear();
091    assertCleared();
092  }
093
094  @MapFeature.Require(SUPPORTS_REMOVE)
095  public void testClearThroughValues() {
096    multimap().values().clear();
097    assertCleared();
098  }
099
100  @MapFeature.Require(SUPPORTS_REMOVE)
101  @CollectionSize.Require(absent = ZERO)
102  public void testClearPropagatesToGet() {
103    for (K key : sampleKeys()) {
104      resetContainer();
105      Collection<V> collection = multimap().get(key);
106      multimap().clear();
107      assertEmpty(collection);
108    }
109  }
110
111  @MapFeature.Require(SUPPORTS_REMOVE)
112  @CollectionSize.Require(absent = ZERO)
113  public void testClearPropagatesToAsMapGet() {
114    for (K key : sampleKeys()) {
115      resetContainer();
116      Collection<V> collection = multimap().asMap().get(key);
117      if (collection != null) {
118        multimap().clear();
119        assertEmpty(collection);
120      }
121    }
122  }
123
124  @MapFeature.Require(SUPPORTS_REMOVE)
125  public void testClearPropagatesToAsMap() {
126    Map<K, Collection<V>> asMap = multimap().asMap();
127    multimap().clear();
128    assertEmpty(asMap);
129  }
130
131  @MapFeature.Require(SUPPORTS_REMOVE)
132  public void testClearPropagatesToEntries() {
133    Collection<Entry<K, V>> entries = multimap().entries();
134    multimap().clear();
135    assertEmpty(entries);
136  }
137}