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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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Stephen Colebourne 2002-08-10 12:13:10 +00:00
parent 25508b395d
commit 1c15cb14c0
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src/test/org/apache/commons/lang/HashCodeUtilsTest.java Normal file
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package org.apache.commons.lang;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import junit.textui.TestRunner;
/**
* Unit tests {@link org.apache.commons.lang.ObjectUtils}.
*
* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
* @author <a href="mailto:ridesmet@users.sourceforge.net">Ringo De Smet</a>
* @version $Id: HashCodeUtilsTest.java,v 1.1 2002/08/10 12:13:10 scolebourne Exp $
*/
public class HashCodeUtilsTest extends TestCase {
public HashCodeUtilsTest(String name) {
super(name);
}
public static void main(String[] args) {
TestRunner.run(suite());
}
public static Test suite() {
TestSuite suite = new TestSuite(HashCodeUtilsTest.class);
suite.setName("HashCodeUtils Tests");
return suite;
}
protected void setUp() throws Exception {
super.setUp();
}
protected void tearDown() throws Exception {
super.tearDown();
}
//-----------------------------------------------------------------------
public void testObject() {
Object obj = null;
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, obj));
obj = new Object();
assertEquals(17 * 37 + obj.hashCode(), HashCodeUtils.buildHashCode(17, obj));
}
public void testLong() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (long) 0L));
assertEquals(17 * 37 + (int) (123456789L ^ (123456789L >> 32)), HashCodeUtils.buildHashCode(17, (long) 123456789L));
}
public void testInt() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (int) 0));
assertEquals(17 * 37 + 123456, HashCodeUtils.buildHashCode(17, (int) 123456));
}
public void testShort() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (short) 0));
assertEquals(17 * 37 + 12345, HashCodeUtils.buildHashCode(17, (short) 12345));
}
public void testChar() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (char) 0));
assertEquals(17 * 37 + 1234, HashCodeUtils.buildHashCode(17, (char) 1234));
}
public void testByte() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (byte) 0));
assertEquals(17 * 37 + 123, HashCodeUtils.buildHashCode(17, (byte) 123));
}
public void testDouble() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (double) 0d));
double d = 1234567.89;
long l = Double.doubleToLongBits(d);
assertEquals(17 * 37 + (int) (l ^ (l >> 32)), HashCodeUtils.buildHashCode(17, d));
}
public void testFloat() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (float) 0f));
float f = 1234.89f;
int i = Float.floatToIntBits(f);
assertEquals(17 * 37 + i, HashCodeUtils.buildHashCode(17, f));
}
public void testBoolean() {
assertEquals(17 * 37 + 0, HashCodeUtils.buildHashCode(17, true));
assertEquals(17 * 37 + 1, HashCodeUtils.buildHashCode(17, false));
}
public void testObjectArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (Object[]) null));
Object[] obj = new Object[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = new Object();
assertEquals((17 * 37 + obj[0].hashCode()) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = new Object();
assertEquals( (17 * 37 + obj[0].hashCode()) * 37 + obj[1].hashCode(), HashCodeUtils.buildHashCode(17, obj));
}
public void testLongArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (long[]) null));
long[] obj = new long[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = 5L;
int h1 = (int) (5L ^ (5L >> 32));
assertEquals((17 * 37 + h1) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = 6L;
int h2 = (int) (6L ^ (6L >> 32));
assertEquals( (17 * 37 + h1) * 37 + h2, HashCodeUtils.buildHashCode(17, obj));
}
public void testIntArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (int[]) null));
int[] obj = new int[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = 5;
assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = 6;
assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
}
public void testShortArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (short[]) null));
short[] obj = new short[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = (short) 5;
assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = (short) 6;
assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
}
public void testCharArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (char[]) null));
char[] obj = new char[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = (char) 5;
assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = (char) 6;
assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
}
public void testByteArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (byte[]) null));
byte[] obj = new byte[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = (byte) 5;
assertEquals((17 * 37 + 5) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = (byte) 6;
assertEquals( (17 * 37 + 5) * 37 + 6, HashCodeUtils.buildHashCode(17, obj));
}
public void testDoubleArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (double[]) null));
double[] obj = new double[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = 5.4d;
long l1 = Double.doubleToLongBits(5.4d);
int h1 = (int) (l1 ^ (l1 >> 32));
assertEquals((17 * 37 + h1) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = 6.3d;
long l2 = Double.doubleToLongBits(6.3d);
int h2 = (int) (l2 ^ (l2 >> 32));
assertEquals( (17 * 37 + h1) * 37 + h2, HashCodeUtils.buildHashCode(17, obj));
}
public void testFloatArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (float[]) null));
float[] obj = new float[2];
assertEquals((17 * 37) * 37 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = 5.4f;
int h1 = Float.floatToIntBits(5.4f);
assertEquals((17 * 37 + h1) * 37, HashCodeUtils.buildHashCode(17, obj));
obj[1] = 6.3f;
int h2 = Float.floatToIntBits(6.3f);
assertEquals( (17 * 37 + h1) * 37 + h2, HashCodeUtils.buildHashCode(17, obj));
}
public void testBooleanArray() {
assertEquals(17 * 37, HashCodeUtils.buildHashCode(17, (boolean[]) null));
boolean[] obj = new boolean[2];
assertEquals((17 * 37 + 1) * 37 + 1 , HashCodeUtils.buildHashCode(17, obj));
obj[0] = true;
assertEquals((17 * 37 + 0) * 37 + 1, HashCodeUtils.buildHashCode(17, obj));
obj[1] = false;
assertEquals( (17 * 37 + 0) * 37 + 1, HashCodeUtils.buildHashCode(17, obj));
}
}