61.095 Definition of flight time as pilot in command under supervision for Part 61
(1) A person’s flight time as pilot in command under supervision is the duration of a flight if:
(a) the person holds a pilot licence; and
(b) the person performs all the duties of the pilot in command for the flight; and
(c) subregulation (2) or (3) applies to the flight.
(2) For paragraph (1)(c), this subregulation applies to the flight if:
(a) the flight is conducted by an operator that has training and checking responsibilities; and
(b) the pilot in command of the flight is authorised by the operator or the operator’s Part 142 operator to conduct the supervision of the person.
(3) For paragraph (1)(c), this subregulation applies to the flight if:
(a) the person is supervised by a flight instructor or flight examiner; and
(b) the person is not receiving flight training.
ICUS seems to be precluded for a licence test if they don't already hold a licence, so RPL would be out.
PPL, CPL or ATPL yes, if you already hold a lower level of licence.
Also ICUS if you're doing a flight test for a rating or an endorsement on a rating, ICUS would work. Otherwise it has to be dual I would say.