Test HashCodeUtils - a utility to build good hashCodes
git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@136954 13f79535-47bb-0310-9956-ffa450edef68
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package org.apache.commons.lang;
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/* ====================================================================
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* The Apache Software License, Version 1.1
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*
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* Copyright (c) 2002 The Apache Software Foundation. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. The end-user documentation included with the redistribution, if
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* any, must include the following acknowlegement:
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* "This product includes software developed by the
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* Apache Software Foundation (http://www.apache.org/)."
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* Alternately, this acknowlegement may appear in the software itself,
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* if and wherever such third-party acknowlegements normally appear.
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*
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* 4. The names "The Jakarta Project", "Commons", and "Apache Software
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* Foundation" must not be used to endorse or promote products derived
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* from this software without prior written permission. For written
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* permission, please contact apache@apache.org.
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*
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* 5. Products derived from this software may not be called "Apache"
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* nor may "Apache" appear in their names without prior written
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* permission of the Apache Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*/
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import junit.framework.Test;
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import junit.framework.TestCase;
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import junit.framework.TestSuite;
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import junit.textui.TestRunner;
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/**
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* Unit tests {@link org.apache.commons.lang.ObjectUtils}.
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*
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* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
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* @author <a href="mailto:ridesmet@users.sourceforge.net">Ringo De Smet</a>
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* @version $Id: HashCodeUtilsTest.java,v 1.1 2002/08/10 12:13:10 scolebourne Exp $
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*/
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public class HashCodeUtilsTest extends TestCase {
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public HashCodeUtilsTest(String name) {
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super(name);
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}
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public static void main(String[] args) {
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TestRunner.run(suite());
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}
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public static Test suite() {
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TestSuite suite = new TestSuite(HashCodeUtilsTest.class);
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suite.setName("HashCodeUtils Tests");
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return suite;
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}
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protected void setUp() throws Exception {
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super.setUp();
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}
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protected void tearDown() throws Exception {
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super.tearDown();
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}
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//-----------------------------------------------------------------------
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public void testObject() {
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Object obj = null;
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, obj));
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obj = new Object();
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assertEquals(17 * 37 + obj.hashCode(), HashCodeUtils.buildHashCode(17, obj));
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}
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public void testLong() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (long) 0L));
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assertEquals(17 * 37 + (int) (123456789L ^ (123456789L >> 32)), HashCodeUtils.buildHashCode(17, (long) 123456789L));
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}
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public void testInt() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (int) 0));
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assertEquals(17 * 37 + 123456, HashCodeUtils.buildHashCode(17, (int) 123456));
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}
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public void testShort() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (short) 0));
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assertEquals(17 * 37 + 12345, HashCodeUtils.buildHashCode(17, (short) 12345));
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}
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public void testChar() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (char) 0));
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assertEquals(17 * 37 + 1234, HashCodeUtils.buildHashCode(17, (char) 1234));
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}
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public void testByte() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (byte) 0));
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assertEquals(17 * 37 + 123, HashCodeUtils.buildHashCode(17, (byte) 123));
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}
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public void testDouble() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (double) 0d));
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double d = 1234567.89;
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long l = Double.doubleToLongBits(d);
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assertEquals(17 * 37 + (int) (l ^ (l >> 32)), HashCodeUtils.buildHashCode(17, d));
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}
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public void testFloat() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (float) 0f));
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float f = 1234.89f;
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int i = Float.floatToIntBits(f);
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assertEquals(17 * 37 + i, HashCodeUtils.buildHashCode(17, f));
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}
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public void testBoolean() {
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assertEquals(17 * 37 + 0, HashCodeUtils.buildHashCode(17, true));
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assertEquals(17 * 37 + 1, HashCodeUtils.buildHashCode(17, false));
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}
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public void testObjectArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (Object[]) null));
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Object[] obj = new Object[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = new Object();
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assertEquals((17 * 37 + obj[0].hashCode()) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = new Object();
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assertEquals( (17 * 37 + obj[0].hashCode()) * 37 + obj[1].hashCode(), HashCodeUtils.buildHashCode(17, obj));
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}
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public void testLongArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (long[]) null));
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long[] obj = new long[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = 5L;
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int h1 = (int) (5L ^ (5L >> 32));
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assertEquals((17 * 37 + h1) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = 6L;
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int h2 = (int) (6L ^ (6L >> 32));
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assertEquals( (17 * 37 + h1) * 37 + h2, HashCodeUtils.buildHashCode(17, obj));
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}
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public void testIntArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (int[]) null));
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int[] obj = new int[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = 5;
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assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = 6;
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assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
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}
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public void testShortArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (short[]) null));
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short[] obj = new short[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = (short) 5;
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assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = (short) 6;
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assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
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}
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public void testCharArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (char[]) null));
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char[] obj = new char[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = (char) 5;
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assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = (char) 6;
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assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
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}
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public void testByteArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (byte[]) null));
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byte[] obj = new byte[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = (byte) 5;
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assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = (byte) 6;
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assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
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}
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public void testDoubleArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (double[]) null));
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double[] obj = new double[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = 5.4d;
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long l1 = Double.doubleToLongBits(5.4d);
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int h1 = (int) (l1 ^ (l1 >> 32));
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assertEquals((17 * 37 + h1) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = 6.3d;
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long l2 = Double.doubleToLongBits(6.3d);
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int h2 = (int) (l2 ^ (l2 >> 32));
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assertEquals( (17 * 37 + h1) * 37 + h2, HashCodeUtils.buildHashCode(17, obj));
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}
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public void testFloatArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (float[]) null));
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float[] obj = new float[2];
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assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = 5.4f;
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int h1 = Float.floatToIntBits(5.4f);
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assertEquals((17 * 37 + h1) * 37, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = 6.3f;
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int h2 = Float.floatToIntBits(6.3f);
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assertEquals( (17 * 37 + h1) * 37 + h2, HashCodeUtils.buildHashCode(17, obj));
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}
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public void testBooleanArray() {
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assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (boolean[]) null));
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boolean[] obj = new boolean[2];
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assertEquals((17 * 37 + 1) * 37 + 1 , HashCodeUtils.buildHashCode(17, obj));
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obj[0] = true;
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assertEquals((17 * 37 + 0) * 37 + 1, HashCodeUtils.buildHashCode(17, obj));
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obj[1] = false;
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assertEquals( (17 * 37 + 0) * 37 + 1, HashCodeUtils.buildHashCode(17, obj));
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}
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}
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