Yes but there is a difference between testing one burket out of thousands and testing the burket that you just purchased. If the max rated pressure of a component in the system is less than the opening pressure of the safety device then what is the point of having a safety device?

Surely it stands to reason that if the item you are using hasn't been designed or tested to 1000 psi then it isn't rated to 1000 psi? Either way its your hand that you are switching the gas on with and not mine.

Hydro test them, water pressure testing is safe(ish) - gas testing isn't.