package org.apidesign.cloneproblem;

import java.util.Date;

import junit.framework.TestCase;

/** Test that would be written by the API hacker.

 *

 * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 */

public class ExploitTest extends TestCase {

    public ExploitTest(String name) {

        super(name);

    }

    public void testExploitOverridableClone() {

        try {

            HackedDate now = new HackedDate();

            HackedDate later = new HackedDate(now.getTime() + 1000);

            Interval interval = new Interval(now, later);

            assertEquals("1s", 1000, interval.getLength());

            fail("And I hoped NullPointerException will be thrown!");

        }  catch (NullPointerException ex) {

            // success, the quest is to generate NullPointerException!

        }

    }

    // BEGIN: interval.exploit

    private static class HackedDate extends Date {

        public HackedDate() {

        }

        public HackedDate(long date) {

            super(date);

        }

        @Override

        public Object clone() {

            return null;

        }

    }

    // END: interval.exploit

}