As I recall the term “Roon Tested” came out a good while after “Roon Ready” had been in place for a while. So prior to us having Roon Tested, what were all those approved-by-Roon USB DACs called if they weren’t Roon Ready? I’m asking - of course - because if I were asked, I’d say they were called Roon Ready. But that memory - possibly incorrect - contradicts what @john has said.
To the best of my knowledge, Roon has never referred to USB audio devices as “Roon Ready”. I can say this with certainty since I joined in early 2018.
To the best of my search capabilities, the first mention of RAAT and Roon Ready came in October of 2015:
I believe that the “RoonSpeakers” software app became what we know as “Roon Bridge” today.