[issue16803] Make test_import & test_importlib run tests under both _frozen_importlib and importlib._bootstrap

[Brett Cannon]

Brett Cannon added the comment:

Turns out this isn't as clean-cut as simply using test.support.import_fresh_module() as you end up with different instances of importlib._bootstrap which kills any possible subclass checks, etc. between e.g. importlib.abc and importlib.machinery as the source versions will have different instances of importlib._bootstrap.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16803>
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