Pop Quiz : JUnit Negative Testing

When will this fail?

public class NegativeTest extends TestCase{

 public void testCalendar() {
   
  try {

       Calendar now = Calendar.getInstance();
    
       for(int i = 0 ; i < 10000000; i++) ;
    
       if(! now.before(Calendar.getInstance()))
           throw new RuntimeException();
    
       fail("Negative test failure");
    
  }catch(Throwable t) { }

 }

}