methodhashtest.java

A static analysis tool to find bugs in Java programs

/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2005, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.ba;

import java.util.Arrays;

import junit.framework.Assert;
import junit.framework.TestCase;

/**
 * @author David Hovemeyer
 */
public class MethodHashTest extends TestCase {

	byte[] hash;
	String s;
	byte[] sameHash;
	byte[] greaterHash;
	byte[] lesserHash;
	byte[] shorterHash;
	byte[] longerHash;

	/* (non-Javadoc)
	 * @see junit.framework.TestCase#setUp()
	 */

	@Override
		 protected void setUp() throws Exception {
		hash = new byte[]{0x06, 0x04, (byte)0xDE, (byte)0xAD, (byte)0xBE, (byte)0xEF};
		s = "0604deadbeef";
		sameHash = new byte[]{0x06, 0x04, (byte)0xDE, (byte)0xAD, (byte)0xBE, (byte)0xEF};
		greaterHash = new byte[]{0x06, 0x05, (byte)0xDE, (byte)0xAD, (byte)0xBE, (byte)0xEF};
		lesserHash = new byte[]{0x06, 0x03, (byte)0xDE, (byte)0xAD, (byte)0xBE, (byte)0xEF};
		shorterHash = new byte[]{0x06, 0x04, (byte)0xDE, (byte)0xAD, (byte)0xBE};
		longerHash = new byte[]{0x06, 0x04, (byte)0xDE, (byte)0xAD, (byte)0xBE, (byte)0xEF, (byte)0x01};
	}

	public void testHashToString() {
		String s2 = ClassHash.hashToString(hash);
		Assert.assertEquals(s, s2);
	}

	public void testStringToHash() {
		byte[] hash2 = ClassHash.stringToHash(s);
		Assert.assertTrue(Arrays.equals(hash, hash2));
	}

	public void testSame() {
		Assert.assertTrue(MethodHash.compareHashes(hash, sameHash) == 0);
		Assert.assertTrue(MethodHash.compareHashes(sameHash, hash) == 0);
	}

	public void testGreater() {
		Assert.assertTrue(MethodHash.compareHashes(hash, greaterHash) < 0);
	}

	public void testLesser() {
		Assert.assertTrue(MethodHash.compareHashes(hash, lesserHash) > 0);
	}

	public void testShorter() {
		Assert.assertTrue(MethodHash.compareHashes(hash, shorterHash) > 0);
	}

	public void testLonger() {
		Assert.assertTrue(MethodHash.compareHashes(hash, longerHash) < 0);
	}
}