JAR-OPS 3.210
"(d) An operator shall not permit a helicopter rotor to be turned under power [for the purpose of flight] without a qualified pilot at the controls."
If the pilot is undergoing a "test" then he's probably not qualified.
FCL 2 has plenty of references.
Also, Stds Doc 28 (1.3.9)
"During the conduct of a type rating in a helicopter, the examiner must occupy a pilot's seat and be legally able to act as a member of the crew of the helicopter."
A bit difficult without controls me thinks.
There's more references I'm sure,
