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 }