1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.collections4.keyvalue;
18
19 import static org.junit.jupiter.api.Assertions.assertSame;
20
21 import java.util.Map;
22
23 import org.apache.commons.collections4.KeyValue;
24 import org.junit.jupiter.api.Test;
25
26 /**
27 * Test the DefaultMapEntry class.
28 */
29 public class DefaultMapEntryTest<K, V> extends AbstractMapEntryTest<K, V> {
30
31 /**
32 * Make an instance of Map.Entry with the default (null) key and value.
33 * Subclasses should override this method to return a Map.Entry
34 * of the type being tested.
35 */
36 @Override
37 public Map.Entry<K, V> makeMapEntry() {
38 return new DefaultMapEntry<>(null, null);
39 }
40
41 /**
42 * Make an instance of Map.Entry with the specified key and value.
43 * Subclasses should override this method to return a Map.Entry
44 * of the type being tested.
45 */
46 @Override
47 public Map.Entry<K, V> makeMapEntry(final K key, final V value) {
48 return new DefaultMapEntry<>(key, value);
49 }
50
51 /**
52 * Subclasses should override this method.
53 */
54 @Test
55 @Override
56 @SuppressWarnings("unchecked")
57 public void testConstructors() {
58 // 1. test key-value constructor
59 final Map.Entry<K, V> entry = new DefaultMapEntry<>((K) key, (V) value);
60 assertSame(key, entry.getKey());
61 assertSame(value, entry.getValue());
62
63 // 2. test pair constructor
64 final KeyValue<K, V> pair = new DefaultKeyValue<>((K) key, (V) value);
65 assertSame(key, pair.getKey());
66 assertSame(value, pair.getValue());
67
68 // 3. test copy constructor
69 final Map.Entry<K, V> entry2 = new DefaultMapEntry<>(entry);
70 assertSame(key, entry2.getKey());
71 assertSame(value, entry2.getValue());
72
73 // test that the objects are independent
74 entry.setValue(null);
75 assertSame(value, entry2.getValue());
76 }
77
78 @Test
79 @Override
80 @SuppressWarnings("unchecked")
81 public void testSelfReferenceHandling() {
82 final Map.Entry<K, V> entry = makeMapEntry();
83
84 entry.setValue((V) entry);
85 assertSame(entry, entry.getValue());
86 }
87
88 }