Barry, I don't know of a specific test, but the boiling water is mentioned in the TREC standards as an option.
(f) Microwave oven. The inspector shall:
(1) report as in need of repair any broken or missing knobs, handles, glass panels, or other parts, or a unit that is not securely mounted;
(2) report as in need of repair any deficiencies in the door and seal (the inspector is not required to test for radiation);
(3) report as in need of repair an oven that does not operate by heating a container of water or with other test equipment, as reasonably determined by the inspector; and
My
other test equipment is the multipurpose rag I carry in my pocket which exhibits an elevated temperature when heated for 10 seconds.
My test equipment is faster and safer and can be used even if no water service is present. I tried using the boiling water thing when I first started out and got burned
once.