I was a little disappointed in the examples though, running a course is an MVP and delivering a meal is an MVP. MVPs don't need to be software, in these cases, the software is actually definitively not a minimal approach, proven with a non software example of the MVP.
So is a test viable? I have asked people to pay for things I hadn't built yet and didn't intend to build if they wouldn't prepay, is that an MVT and not an MVP? Are waitlists and crowdfunding campaigns MVTs?