Yep, my idea was to add a really thin regrtest integration layer for these self-tests (which have no reason to move to Lib/tests, really), e.g. add a tests.test_demos_tools module that would import all these test functions and stuff them into a unittest test suite.

I did not detail that in my report since I wanted first an agreement on the idea (i.e. a core dev setting resolution to accepted :)