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 static com.google.common.truth.Truth.assertThat;
20import static java.util.Arrays.asList;
21
22import com.google.common.annotations.GwtCompatible;
23import com.google.common.collect.testing.google.TestStringMultisetGenerator;
24
25import junit.framework.TestCase;
26
27import java.util.Arrays;
28import java.util.List;
29
30/**
31 * Unit test for {@link LinkedHashMultiset}.
32 *
33 * @author Kevin Bourrillion
34 */
35@GwtCompatible(emulated = true)
36public class LinkedHashMultisetTest extends TestCase {
37
38  private static TestStringMultisetGenerator linkedHashMultisetGenerator() {
39    return new TestStringMultisetGenerator() {
40      @Override protected Multiset<String> create(String[] elements) {
41        return LinkedHashMultiset.create(asList(elements));
42      }
43
44      @Override
45      public List<String> order(List<String> insertionOrder) {
46        List<String> order = Lists.newArrayList();
47        for (String s : insertionOrder) {
48          int index = order.indexOf(s);
49          if (index == -1) {
50            order.add(s);
51          } else {
52            order.add(index, s);
53          }
54        }
55        return order;
56      }
57    };
58  }
59
60  public void testCreate() {
61    Multiset<String> multiset = LinkedHashMultiset.create();
62    multiset.add("foo", 2);
63    multiset.add("bar");
64    assertEquals(3, multiset.size());
65    assertEquals(2, multiset.count("foo"));
66    assertEquals("[foo x 2, bar]", multiset.toString());
67  }
68
69  public void testCreateWithSize() {
70    Multiset<String> multiset = LinkedHashMultiset.create(50);
71    multiset.add("foo", 2);
72    multiset.add("bar");
73    assertEquals(3, multiset.size());
74    assertEquals(2, multiset.count("foo"));
75    assertEquals("[foo x 2, bar]", multiset.toString());
76  }
77
78  public void testCreateFromIterable() {
79    Multiset<String> multiset
80        = LinkedHashMultiset.create(Arrays.asList("foo", "bar", "foo"));
81    assertEquals(3, multiset.size());
82    assertEquals(2, multiset.count("foo"));
83    assertEquals("[foo x 2, bar]", multiset.toString());
84  }
85
86  public void testToString() {
87    Multiset<String> ms = LinkedHashMultiset.create();
88    ms.add("a", 3);
89    ms.add("c", 1);
90    ms.add("b", 2);
91
92    assertEquals("[a x 3, c, b x 2]", ms.toString());
93  }
94
95  public void testLosesPlaceInLine() throws Exception {
96    Multiset<String> ms = LinkedHashMultiset.create();
97    ms.add("a");
98    ms.add("b", 2);
99    ms.add("c");
100    assertThat(ms.elementSet()).has().exactly("a", "b", "c").inOrder();
101    ms.remove("b");
102    assertThat(ms.elementSet()).has().exactly("a", "b", "c").inOrder();
103    ms.add("b");
104    assertThat(ms.elementSet()).has().exactly("a", "b", "c").inOrder();
105    ms.remove("b", 2);
106    ms.add("b");
107    assertThat(ms.elementSet()).has().exactly("a", "c", "b").inOrder();
108  }
109}
110
111