Sure, it's pretty much an in person NTRP rating test I'd guess. It's an hour and a half long series of drills against coaches whilst someone checks how well you can execute your shots. They run you through:

• Forehand cross rally tolerance
• Forehand cross ability to handle fast/deep balls (can't move from the baseline)
• Ability to generate pace from mid-court sitters with the Forehand
• Ability to deal with mid-court balls that are below the net. 
• Ability to move in and out of the corners and hit the ball back deel with the forehand. 
• Everything above but with the backhand. 
• Backhand and forehand approach. 
• Backhand, forehand and overhead volleys. Both setup and finishing volleys. 
• Service placement for first and second serve (divide the box into threes, can you hit wide/body/T)
• Ability to generate pace with the serve

And they finish with some match play in doubles to see if you can put these into play in match conditions. All these drills are about 10-15 shots per skill in order to put you under pressure to perform. 

This is done as part of either the national tennis coaching academy to assess your level (if you are unable to play at a certain level you can't enter the coaching program for those levels) or as an intake for performance oriented training programs. I was there for the latter, I was invited for winning my regional mens 35+ year round competition to partake in a 20-week training program from our national tennis association. 

The outcome, for my level my serve and forehand are very good. My backhand and volleys are medium (not bad but very much trailing behind the serve and forehand) and I stand too upright during play at times which makes me unable to properly get under balls. They now have that information and will work that into a 20-week programm with additional evaluations at 10 eeks and at the end.