Hmmm.... 'CM' I am not all knowing about the F-35 programme - particularly any country other than my own (I guess I'll have to include the good ole USofA because they have it all eh).
AFAIK a test aircraft is 'orange-wired' which apparently means something (recording devices can be specifically attached for test purposes I gather). This aspect of the F-35 does not interest me that much. You will gather I'm interested in NavAv. Your question has not been answered though - perhaps others more knowledgeable will have a go?
The 'test' aircraft will have to be able to send back the data for recording also according to this video:
Test Pilot Tuesday Episode 25 Published on Apr 16, 2013
"F-35 test pilot Paul Hattendorf answers the question, "Since the F-35 is a single seat aircraft, how is data from test flights provided to engineers?"