When you ride to complete failure on those intervals, you’ll be coasting for a bit afterwards. 
Set 1 is ~2:30 min intervals @ just above TP and rising through the final burn.
Set 2 is ~30 sec intervals @ higher watts, higher count, similar pattern.
The goal of any BT attempt is to draw down MPA and flatline it for 5-7 sec minimum.
Or you might attempt to punch through your PP if a workout includes some max sprint efforts like Version 2 does.
IRL this means any HIT workout or hard ride has the potential to induce a BT if you decide to go for one. I.e., a maximal effort under fatigue that exceeds your current signature values.
I’m liking the way you can gamify the process by leveraging XMB.
No “formal test” is required to feed Xert’s signature model. 