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Java example source code file (ConstantInitializerTest.java)

This example Java source code file (ConstantInitializerTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

before, concurrentexception, constantinitializer, constantinitializertest, different, exception, integer, not, object, pattern, regex, string, test, value, wrong

The ConstantInitializerTest.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.lang3.concurrent;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.util.regex.Pattern;

import org.junit.Before;
import org.junit.Test;

/**
 * Test class for {@code ConstantInitializer}.
 */
public class ConstantInitializerTest {
    /** Constant for the object managed by the initializer. */
    private static final Integer VALUE = 42;

    /** The initializer to be tested. */
    private ConstantInitializer<Integer> init;

    @Before
    public void setUp() throws Exception {
        init = new ConstantInitializer<Integer>(VALUE);
    }

    /**
     * Helper method for testing equals() and hashCode().
     *
     * @param obj the object to compare with the test instance
     * @param expected the expected result
     */
    private void checkEquals(final Object obj, final boolean expected) {
        assertTrue("Wrong result of equals", expected == init.equals(obj));
        if (obj != null) {
            assertTrue("Not symmetric", expected == obj.equals(init));
            if (expected) {
                assertEquals("Different hash codes", init.hashCode(),
                        obj.hashCode());
            }
        }
    }

    /**
     * Tests whether the correct object is returned.
     */
    @Test
    public void testGetObject() {
        assertEquals("Wrong object", VALUE, init.getObject());
    }

    /**
     * Tests whether get() returns the correct object.
     *
     * @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
     */
    @Test
    public void testGet() throws ConcurrentException {
        assertEquals("Wrong object", VALUE, init.get());
    }

    /**
     * Tests equals() if the expected result is true.
     */
    @Test
    public void testEqualsTrue() {
        checkEquals(init, true);
        ConstantInitializer<Integer> init2 = new ConstantInitializer(
                Integer.valueOf(VALUE.intValue()));
        checkEquals(init2, true);
        init = new ConstantInitializer<Integer>(null);
        init2 = new ConstantInitializer<Integer>(null);
        checkEquals(init2, true);
    }

    /**
     * Tests equals() if the expected result is false.
     */
    @Test
    public void testEqualsFalse() {
        ConstantInitializer<Integer> init2 = new ConstantInitializer(
                null);
        checkEquals(init2, false);
        init2 = new ConstantInitializer<Integer>(VALUE + 1);
        checkEquals(init2, false);
    }

    /**
     * Tests equals() with objects of other classes.
     */
    @Test
    public void testEqualsWithOtherObjects() {
        checkEquals(null, false);
        checkEquals(this, false);
        checkEquals(new ConstantInitializer<String>("Test"), false);
    }

    /**
     * Tests the string representation.
     */
    @Test
    public void testToString() {
        final String s = init.toString();
        final Pattern pattern = Pattern
                .compile("ConstantInitializer@-?\\d+ \\[ object = " + VALUE
                        + " \\]");
        assertTrue("Wrong string: " + s, pattern.matcher(s).matches());
    }

    /**
     * Tests the string representation if the managed object is null.
     */
    @Test
    public void testToStringNull() {
        final String s = new ConstantInitializer<Object>(null).toString();
        assertTrue("Object not found: " + s, s.indexOf("object = null") > 0);
    }
}

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