It's probably going to depend as to who is on board with you. Personally, as you have your licence I would you to want to prove that you can use everything on board to aid your flight (including GPS) especially if the S*?t hits the metaphorical fan.
Having said that - if you were obviously obsessed with the thing I would make a point of asking you to do a position fix (VDF / VOR / DME) and maybe even track a VOR radial for a bit to prove that you can live without it. Most importantly your head should be out the window looking for ground features. It is a VISUAL flight test afterall.
Hope that vaguely helps.