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.lang3.concurrent;
18
19 import static org.junit.jupiter.api.Assertions.assertFalse;
20 import static org.junit.jupiter.api.Assertions.assertTrue;
21
22 import org.junit.jupiter.api.BeforeEach;
23 import org.junit.jupiter.api.Test;
24
25 /**
26 * Tests {@code LazyInitializer}.
27 */
28 public class LazyInitializerSingleInstanceTest extends AbstractConcurrentInitializerTest {
29
30 /**
31 * A test implementation of LazyInitializer. This class creates a plain Object. As Object does not provide a specific equals() method, it is easy to check
32 * whether multiple instances were created.
33 */
34 private static final class LazyInitializerTestImpl extends LazyInitializer<Object> {
35 @Override
36 protected Object initialize() {
37 return new Object();
38 }
39 }
40
41 /** The initializer to be tested. */
42 private LazyInitializerTestImpl initializer;
43
44 /**
45 * Creates the initializer to be tested. This implementation returns the {@code LazyInitializer} created in the {@code setUp()} method.
46 *
47 * @return the initializer to be tested
48 */
49 @Override
50 protected LazyInitializer<Object> createInitializer() {
51 return initializer;
52 }
53
54 @BeforeEach
55 public void setUp() {
56 initializer = new LazyInitializerTestImpl();
57 }
58
59 @Test
60 public void testIsInitialized() throws ConcurrentException {
61 final LazyInitializer<Object> initializer = createInitializer();
62 assertFalse(initializer.isInitialized());
63 initializer.get();
64 assertTrue(initializer.isInitialized());
65 }
66 }