I suspect that in Canada, "OEM" test flying is somewhat limited too. With the exception of a little I have done with Diamond, all of my test flying has been to support modification approvals on certified aircraft - mostly booms and pods hanging from aircraft, and some float and ski installations.
As such, I write my own test plans, and by agreement with the authority, test only those elements requiring evaluation. But, still, sometimes that it still tedious! When you must fly dozens of climbs, with extremely precise airspeed control, and write down data constantly, it can seem like "work", when you land to top off the tanks, to go for more...