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dbUnit is a JUnit extension (also usable from Ant and Maven) targeted for database-driven projects that, among other things, puts your database into a known state between test runs. This is an excellent way to avoid the myriad of problems that can occur when one test case corrupts the database and causes subsequent tests to fail or exacerbate the damage.

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/*
 *
 *  The DbUnit Database Testing Framework
 *  Copyright (C)2002-2008, DbUnit.org
 *
 *  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 org.dbunit.assertion;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Dbunit's own small assertion utility, independent from the testing framework
 * that is used.
 * 
 * @author gommma (gommma AT users.sourceforge.net)
 * @author Last changed by: $Author: gommma $
 * @version $Revision: 879 $ $Date: 2008-11-16 07:09:08 -0600 (Sun, 16 Nov 2008) $
 * @since 2.4.0
 */
public class SimpleAssert 
{
    /**
     * Logger for this class
     */
    private static final Logger logger = LoggerFactory.getLogger(SimpleAssert.class);

    private FailureHandler failureHandler;
    
    public SimpleAssert(FailureHandler failureHandler)
    {
        if (failureHandler == null) {
            throw new NullPointerException(
                    "The parameter 'failureHandler' must not be null");
        }
        this.failureHandler = failureHandler;
    }
    
    /**
     * Asserts that propertyName is not a null String and has a length greater
     * than zero.
     */
    protected void assertNotNullNorEmpty( String propertyName, String property )
    {
        logger.debug("assertNotNullNorEmpty(propertyName={}, property={}) - start", propertyName, property);

        assertTrue( propertyName + " is null", property != null );
        assertTrue( "Invalid " + propertyName, property.trim()
                .length() > 0 );
    }

    public void assertTrue(boolean condition) {
        assertTrue(null, condition);
    }
    
    /**
     * Evaluate if the given condition is true or not.
     * @param message message displayed if assertion is false
     * @param condition condition to be tested
     */
    public void assertTrue(String message, boolean condition) {
        if (!condition) {
            fail( message );
        }
    }

    public void assertNotNull(Object object) {
        assertTrue(null, object!=null);
    }

    public void assertNotNull(String message, Object object) {
        assertTrue(message, object!=null);
    }
    
    public void fail(String message) {
        throw failureHandler.createFailure(message);
    }

}