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      1 /*
      2  * Copyright (C) 2013 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.features.CollectionSize.ZERO;
     20 import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
     21 import static com.google.common.truth.Truth.assertThat;
     22 
     23 import com.google.common.annotations.GwtCompatible;
     24 import com.google.common.collect.Multimap;
     25 import com.google.common.collect.testing.features.CollectionSize;
     26 import com.google.common.collect.testing.features.MapFeature;
     27 
     28 import java.util.Collection;
     29 import java.util.Map;
     30 import java.util.Map.Entry;
     31 
     32 /**
     33  * Tests for {@link Multimap#clear()}.
     34  *
     35  * @author Louis Wasserman
     36  */
     37 @GwtCompatible
     38 public class MultimapClearTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
     39   @CollectionSize.Require(absent = ZERO)
     40   @MapFeature.Require(absent = SUPPORTS_REMOVE)
     41   public void testClearUnsupported() {
     42     try {
     43       multimap().clear();
     44       fail("Expected UnsupportedOperationException");
     45     } catch (UnsupportedOperationException expected) {}
     46   }
     47 
     48   private void assertCleared() {
     49     assertEquals(0, multimap().size());
     50     assertTrue(multimap().isEmpty());
     51     assertEquals(multimap(), getSubjectGenerator().create());
     52     assertThat(multimap().entries()).isEmpty();
     53     assertThat(multimap().asMap()).isEmpty();
     54     assertThat(multimap().keySet()).isEmpty();
     55     assertThat(multimap().keys()).isEmpty();
     56     assertThat(multimap().values()).isEmpty();
     57     for (K key : sampleKeys()) {
     58       assertGet(key);
     59     }
     60   }
     61 
     62   @MapFeature.Require(SUPPORTS_REMOVE)
     63   public void testClear() {
     64     multimap().clear();
     65     assertCleared();
     66   }
     67 
     68   @MapFeature.Require(SUPPORTS_REMOVE)
     69   public void testClearThroughEntries() {
     70     multimap().entries().clear();
     71     assertCleared();
     72   }
     73 
     74   @MapFeature.Require(SUPPORTS_REMOVE)
     75   public void testClearThroughAsMap() {
     76     multimap().asMap().clear();
     77     assertCleared();
     78   }
     79 
     80   @MapFeature.Require(SUPPORTS_REMOVE)
     81   public void testClearThroughKeySet() {
     82     multimap().keySet().clear();
     83     assertCleared();
     84   }
     85 
     86   @MapFeature.Require(SUPPORTS_REMOVE)
     87   public void testClearThroughKeys() {
     88     multimap().keys().clear();
     89     assertCleared();
     90   }
     91 
     92   @MapFeature.Require(SUPPORTS_REMOVE)
     93   public void testClearThroughValues() {
     94     multimap().values().clear();
     95     assertCleared();
     96   }
     97 
     98   @MapFeature.Require(SUPPORTS_REMOVE)
     99   @CollectionSize.Require(absent = ZERO)
    100   public void testClearPropagatesToGet() {
    101     for (K key : sampleKeys()) {
    102       resetContainer();
    103       Collection<V> collection = multimap().get(key);
    104       multimap().clear();
    105       assertThat(collection).isEmpty();
    106     }
    107   }
    108 
    109   @MapFeature.Require(SUPPORTS_REMOVE)
    110   @CollectionSize.Require(absent = ZERO)
    111   public void testClearPropagatesToAsMapGet() {
    112     for (K key : sampleKeys()) {
    113       resetContainer();
    114       Collection<V> collection = multimap().asMap().get(key);
    115       if (collection != null) {
    116         multimap().clear();
    117         assertThat(collection).isEmpty();
    118       }
    119     }
    120   }
    121 
    122   @MapFeature.Require(SUPPORTS_REMOVE)
    123   public void testClearPropagatesToAsMap() {
    124     Map<K, Collection<V>> asMap = multimap().asMap();
    125     multimap().clear();
    126     assertThat(asMap).isEmpty();
    127   }
    128 
    129   @MapFeature.Require(SUPPORTS_REMOVE)
    130   public void testClearPropagatesToEntries() {
    131     Collection<Entry<K, V>> entries = multimap().entries();
    132     multimap().clear();
    133     assertThat(entries).isEmpty();
    134   }
    135 }
    136