Harold: Last info I have is the test button is the only method. There are/were a few devices on the market, pricey, and may or may not be compatable with all brands.
SQD & SEimens reccomend the test button only.
DCA said any circuit that is 'extended'...the EC owns the whole circuit. This is where the 'truth-in-installation' (trust) comes to play. Anything within the existing structure could fall into rehab. Guess a case by case situation to start.
