It tests reactions, ability to move limbs, strength, coordination, ability to think and react, heart, hearing, and separate vision test. It is not a fun thing. I find it rather distressing.
I go to my Family Doctor for it. I dont think He would perform it without a good reason. It is a rather serious thing.
It just may reveal something that would lead to losing driving privileges. The report goes into the Ministry of Transport like it or not.
This is serious stuff not a game.
I have to do one every 5 years to keep my Class D license and 4 for my Pilot license.
I have DZM class.
The Pilot license physical is even more thorough and frequent.
I can not see why anyone would want to risk losing their licence for fun or have a government agency asking "WHY"?
Then I am not a gambler or Med Fet Aficionado so what do I know?
You and your Doctor playmate may use this as a guide to create a scene. Don't trouble a Real Doctor it is a very serious thing for them to perform.
https://www.ontario.ca/page/medical-vision-and-hearing-standards-commercial-drivers
Things of interest to read
https://www.ontario.ca/document/official-ministry-transportation-mto-bus-handbook/licence-classes-and-combinations
https://www.ontario.ca/page/get-truck-drivers-licence
https://tc.canada.ca/en/corporate-services/acts-regulations/list-regulations/canadian-aviation-regulations-sor-96-433/standards/standard-424-medical-requirements/standard-424-appendix-ii-limitations-restrictions-which-may-appear-permit-licence-medical-certificate#physical