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;
20import com.google.common.collect.Multiset.Entry;
21
22import junit.framework.TestCase;
23
24import java.util.Collections;
25
26/**
27 * Tests for {@link Multisets#immutableEntry}.
28 *
29 * @author Mike Bostock
30 */
31@GwtCompatible
32public class MultisetsImmutableEntryTest extends TestCase {
33  private static final String NE = null;
34
35  private static <E> Entry<E> entry(final E element, final int count) {
36    return Multisets.immutableEntry(element, count);
37  }
38
39  private static <E> Entry<E> control(E element, int count) {
40    return HashMultiset.create(Collections.nCopies(count, element))
41        .entrySet().iterator().next();
42  }
43
44  public void testToString() {
45    assertEquals("foo", entry("foo", 1).toString());
46    assertEquals("bar x 2", entry("bar", 2).toString());
47  }
48
49  public void testToStringNull() {
50    assertEquals("null", entry(NE, 1).toString());
51    assertEquals("null x 2", entry(NE, 2).toString());
52  }
53
54  public void testEquals() {
55    assertEquals(control("foo", 1), entry("foo", 1));
56    assertEquals(control("bar", 2), entry("bar", 2));
57    assertFalse(control("foo", 1).equals(entry("foo", 2)));
58    assertFalse(entry("foo", 1).equals(control("bar", 1)));
59    assertFalse(entry("foo", 1).equals(new Object()));
60    assertFalse(entry("foo", 1).equals(null));
61  }
62
63  public void testEqualsNull() {
64    assertEquals(control(NE, 1), entry(NE, 1));
65    assertFalse(control(NE, 1).equals(entry(NE, 2)));
66    assertFalse(entry(NE, 1).equals(control("bar", 1)));
67    assertFalse(entry(NE, 1).equals(new Object()));
68    assertFalse(entry(NE, 1).equals(null));
69  }
70
71  public void testHashCode() {
72    assertEquals(control("foo", 1).hashCode(), entry("foo", 1).hashCode());
73    assertEquals(control("bar", 2).hashCode(), entry("bar", 2).hashCode());
74  }
75
76  public void testHashCodeNull() {
77    assertEquals(control(NE, 1).hashCode(), entry(NE, 1).hashCode());
78  }
79
80  public void testNegativeCount() {
81    try {
82      entry("foo", -1);
83      fail();
84    } catch (IllegalArgumentException expected) {}
85  }
86}
87