You could bet an examiner will want to see instrument proficiency period. If your buddy has been using those instrument priveleges, he shouldn't have a problem. For a checkride, I'd bet on stuff similar to an Instrument Proficiency Check. In fact, the whole thing will probably be like an IPC. Fly through at least one approach and a single engine approach, most likely with a hold entry, if not a complete circuit. That would be my guess, and you do want to check with your favorite DPE.