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      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 
     15 package com.google.common.collect.testing.google;
     16 
     17 import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ITERATOR_REMOVE;
     18 import static com.google.common.collect.testing.features.CollectionSize.ONE;
     19 import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
     20 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEYS;
     21 import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
     22 import static com.google.common.collect.testing.features.MapFeature.SUPPORTS_REMOVE;
     23 import static com.google.common.truth.Truth.assertThat;
     24 
     25 import com.google.common.annotations.GwtCompatible;
     26 import com.google.common.collect.Multimap;
     27 import com.google.common.collect.Multiset;
     28 import com.google.common.collect.Multisets;
     29 import com.google.common.collect.testing.Helpers;
     30 import com.google.common.collect.testing.features.CollectionFeature;
     31 import com.google.common.collect.testing.features.CollectionSize;
     32 import com.google.common.collect.testing.features.MapFeature;
     33 
     34 import java.util.Iterator;
     35 
     36 /**
     37  * Tester for {@code Multimap.entries}.
     38  *
     39  * @author Louis Wasserman
     40  */
     41 @GwtCompatible
     42 public class MultimapKeysTester<K, V> extends AbstractMultimapTester<K, V, Multimap<K, V>> {
     43   @CollectionSize.Require(SEVERAL)
     44   public void testKeys() {
     45     resetContainer(
     46         Helpers.mapEntry(sampleKeys().e0, sampleValues().e0),
     47         Helpers.mapEntry(sampleKeys().e0, sampleValues().e1),
     48         Helpers.mapEntry(sampleKeys().e1, sampleValues().e0));
     49     Multiset<K> keys = multimap().keys();
     50     assertEquals(2, keys.count(sampleKeys().e0));
     51     assertEquals(1, keys.count(sampleKeys().e1));
     52     assertEquals(3, keys.size());
     53     assertThat(keys).has().allOf(sampleKeys().e0, sampleKeys().e1);
     54     assertThat(keys.entrySet()).has().allOf(
     55         Multisets.immutableEntry(sampleKeys().e0, 2),
     56         Multisets.immutableEntry(sampleKeys().e1, 1));
     57   }
     58 
     59   @MapFeature.Require(ALLOWS_NULL_KEY_QUERIES)
     60   public void testKeysCountAbsentNullKey() {
     61     assertEquals(0, multimap().keys().count(null));
     62   }
     63 
     64   @CollectionSize.Require(SEVERAL)
     65   @MapFeature.Require(ALLOWS_NULL_KEYS)
     66   public void testKeysWithNullKey() {
     67     resetContainer(
     68         Helpers.mapEntry((K) null, sampleValues().e0),
     69         Helpers.mapEntry((K) null, sampleValues().e1),
     70         Helpers.mapEntry(sampleKeys().e1, sampleValues().e0));
     71     Multiset<K> keys = multimap().keys();
     72     assertEquals(2, keys.count(null));
     73     assertEquals(1, keys.count(sampleKeys().e1));
     74     assertEquals(3, keys.size());
     75     assertThat(keys).has().allOf(null, sampleKeys().e1);
     76     assertThat(keys.entrySet()).has().allOf(
     77         Multisets.immutableEntry((K) null, 2),
     78         Multisets.immutableEntry(sampleKeys().e1, 1));
     79   }
     80 
     81   public void testKeysElementSet() {
     82     assertEquals(multimap().keySet(), multimap().keys().elementSet());
     83   }
     84 
     85   @MapFeature.Require(SUPPORTS_REMOVE)
     86   public void testKeysRemove() {
     87     int original = multimap().keys().remove(sampleKeys().e0, 1);
     88     assertEquals(Math.max(original - 1, 0), multimap().get(sampleKeys().e0).size());
     89   }
     90 
     91   @CollectionSize.Require(ONE)
     92   @CollectionFeature.Require(SUPPORTS_ITERATOR_REMOVE)
     93   public void testKeysEntrySetIteratorRemove() {
     94     Multiset<K> keys = multimap().keys();
     95     Iterator<Multiset.Entry<K>> itr = keys.entrySet().iterator();
     96     assertEquals(Multisets.immutableEntry(sampleKeys().e0, 1),
     97         itr.next());
     98     itr.remove();
     99     assertTrue(multimap().isEmpty());
    100   }
    101 
    102   @CollectionSize.Require(SEVERAL)
    103   @MapFeature.Require(SUPPORTS_REMOVE)
    104   public void testKeysEntrySetRemove() {
    105     resetContainer(
    106         Helpers.mapEntry(sampleKeys().e0, sampleValues().e0),
    107         Helpers.mapEntry(sampleKeys().e0, sampleValues().e1),
    108         Helpers.mapEntry(sampleKeys().e1, sampleValues().e0));
    109     assertTrue(multimap().keys().entrySet().remove(
    110         Multisets.immutableEntry(sampleKeys().e0, 2)));
    111     assertEquals(1, multimap().size());
    112     assertTrue(multimap().containsEntry(sampleKeys().e1, sampleValues().e0));
    113   }
    114 }
    115