[issue14715] test.support.DirsOnSysPath should be replaced by importlib.test.util.import_state

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

The current tests don't like setting sys.modules to [].

I like resetting everything (including sys.modules) back to the original state. Otherwise some tests, which do things like "import foo", affect later tests.

So, I think I'll leave the patch as-is. I'll rename it, fix all references to it, then check it in. After that I'll start using it in other tests.

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