Who crews a warship during sea trials?

Are sea trials crewed by shipyard staff or the ship's future crew?

Usually by a mixture of builder staff, naval assessors, and some personnel who will form the ship's first crew.

Sea trials were a shared transition from the builder to the navy. Yard personnel brought detailed knowledge of the machinery and systems they constructed. Naval representatives assessed whether the ship met service requirements. Members of the intended first crew also participated, gaining familiarity while helping test the vessel they would soon operate.