Getting Junit to find my tests (Urgent)

Hi, I'm new to Junit and have read all the info on Junit.org but am stuck. For some reason, Junit keeps telling me that "No tests were found in TestValidator".

Here is my simple test class:

testimport junit.framework.*;

import edu.depaul.cti.se450.traffic.common.Validator;

import java.util.*;

public class TestValidator extends TestCase {

public void isNumeric() {

ArrayList emptyList = new ArrayList();

assertEquals("Size should be 0",0,emptyList.size());

}

when I run java junit.textui.TestRunner Validator it cannot find the test! I appreciate your help as my program is due in 5 hours. Program is working, but I cannot get Junit to work! THANKS IN ADVANCE!

}

[737 byte] By [bp2alba] at [2007-9-30 2:25:20]