Hey @john.hancock !
Glad you are enjoying the plan so far 
The plan starts and ends with an FTP test, no need to over test and do another in between those two.
Regarding zwift racing, you can do those if/when your plan calls for an attack-eque group ride on the weekends (which is found later in SSP3).
Check out this thread for more info on that:
Can I Modify My Training Plan to Work Around the ZRL Season 2>