HashMultimapTest.java revision 1d580d0f6ee4f21eb309ba7b509d2c6d671c4044 
1/*
2 * Copyright (C) 2007 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
17package com.google.common.collect;
18
19import com.google.common.annotations.GwtCompatible;
20
21/**
22 * Unit tests for {@link HashMultimap}.
23 *
24 * @author Jared Levy
25 */
26@GwtCompatible
27public class HashMultimapTest extends AbstractSetMultimapTest {
28  @Override protected Multimap<String, Integer> create() {
29    return HashMultimap.create();
30  }
31
32  /*
33   * The behavior of toString() is tested by TreeMultimap, which shares a
34   * lot of code with HashMultimap and has deterministic iteration order.
35   */
36  public void testCreate() {
37    HashMultimap<String, Integer> multimap = HashMultimap.create();
38    multimap.put("foo", 1);
39    multimap.put("bar", 2);
40    multimap.put("foo", 3);
41    assertEquals(ImmutableSet.of(1, 3), multimap.get("foo"));
42    assertEquals(8, multimap.expectedValuesPerKey);
43  }
44
45  public void testCreateFromMultimap() {
46    Multimap<String, Integer> multimap = createSample();
47    HashMultimap<String, Integer> copy = HashMultimap.create(multimap);
48    assertEquals(multimap, copy);
49    assertEquals(8, copy.expectedValuesPerKey);
50  }
51
52  public void testCreateFromSizes() {
53    HashMultimap<String, Integer> multimap = HashMultimap.create(20, 15);
54    multimap.put("foo", 1);
55    multimap.put("bar", 2);
56    multimap.put("foo", 3);
57    assertEquals(ImmutableSet.of(1, 3), multimap.get("foo"));
58    assertEquals(15, multimap.expectedValuesPerKey);
59  }
60
61  public void testCreateFromIllegalSizes() {
62    try {
63      HashMultimap.create(-20, 15);
64      fail();
65    } catch (IllegalArgumentException expected) {}
66
67    try {
68      HashMultimap.create(20, -15);
69      fail();
70    } catch (IllegalArgumentException expected) {}
71  }
72
73  public void testEmptyMultimapsEqual() {
74    Multimap<String, Integer> setMultimap = HashMultimap.create();
75    Multimap<String, Integer> listMultimap = ArrayListMultimap.create();
76    assertTrue(setMultimap.equals(listMultimap));
77    assertTrue(listMultimap.equals(setMultimap));
78  }
79}
80