Why do you need to test them on the ground apart from do they switch on and remove flags and thats subject to range so unreliable-- you test then before use in the air--thats were they are designed to work. A corrrectly identified morse signal is the only guaranteed indication on the ground if the aid is within range. Directional signals received on the ground are subject to errors.
Then again looking at your first posting in response to this query perhaps you should have a rethink about your answer