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Instead of using python directly in a subprocess, try calling a shell command that in turns calls python. (Admittedly, this may look like the pipe scenario...)
In theory, you could even drive another python interactively, using a GUI runner, but I'm not sure how much new infrastructure that would add to the test suite, so it might not be worth it.
I'm not aware of a list of manual tests (though perhaps there *should* be one...); I would put it under the DeprecationWarning docs, sort of like an example. Others may have better ideas.