What is the point of testing it, anyway?
If you found 9" speckled tiles in the basement … do you have your client pop one out and test it, too? What about the adhesive holding them to the floor?
Shouldn’t the client remove a few copper elbows to see if there is lead in the solder?
Most people are surprised to learn that asbestos is still … as I type this post … being used in building materials for new construction.
If the ceiling is intact, leave it alone. If it is not, recommend that it be repaired or replaced by a qualified contractor.
I can’t blame any seller who refuses to have bits and pieces of their home snipped off and analyzed. I wouldn’t allow such a thing either.