Hi,
I guess u need to use junit extensions. Hope this helps u.

import junit.framework.*;
import junit.extensions.* ;

// helps u to run tests for specified no of times

public class SimpleRepeated extends RepeatedTest 
{
	
	public SimpleRepeated(Test test, int repeat){
		super(test,repeat);
	}

	public static void main(String[] args) 
	{
		SimpleRepeated sr = new SimpleRepeated(new SimpleSetup(),2);
		TestResult tr = new TestResult();
		sr.run(tr);
	}
}

----------------------------------------------------

// allows to construct setup and tear down

public class  SimpleSetup extends TestSetup
{
	static int i = 1;

	public SimpleSetup(Test test){
		super(test);
	}

	public SimpleSetup(){
		super(SimpleTest.suite());
	}

	protected void setUp() {
		System.out.println("SS setup " + i);
		i++;
		// code to test the value of i and change the  TestCase test variable values
	}

	protected void tearDown() {
		System.out.println("SS tear down");
	}
}

-----------------------------------------------

public class SimpleTest extends TestCase {
	protected int fValue1;
	protected int fValue2;

	public SimpleTest(){
			super();
	}

	public SimpleTest(String type){
			super(type);
	}

	// get set methods for test variables fValue1, fValue2 

	public void testXXX() {
		// code for the method
	}
	// other test methods

	public static Test suite() {
		TestSuite suite= new TestSuite();
		return new TestSuite(SimpleTest.class);
	}
}

i hope this provides some control on the values.
u can look for other junit extensions 'suiterunner-1.0beta6' (www.artima.com) which can serve your purpose.

hope this provided some help.

regards
Jani