My take on it

• if a test is called it should have fresh fixtures
• you need to know which variables need to be initialized as fixtures
• you need to know which tests use which fixtures

I think this can be done with a combination of PadWalker to scan the sub, and variable attributes to initialize them as fixture objects.

Unfortunately I'll be several days AFK, so I can't show you a POC.

Anyway I think you are rather inclined to do the PyWay and I've probably missed some edge cases.

(Tho you already mentioned py-decorators, and that's attributes in Perl.)

Feel free to ignore my thoughts and do as you like ...

Hope this helped nonetheless... :)