Having done hundreds of acceptance tests, and written the procedures for several models, I can say that they generally match the maintenance manual flight test procedures and measurements. Sometimes a new aircraft is held to a somewhat higher standard than the maintenance manual, but generall there has been pressure to make sure the numbers are the same (for several reasons including the basic question: whay is a field aircraft allowed a poorer performance?)
Look to the flight teat and ground test procedures outlined in the flight test guide or maintenance manual as the best approximation of the quality standard to which a new aircraft is held.
Most of the operators I have flown with use the same guides.