[issue19696] Merge all (non-syntactic) import-related tests into test_importlib

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

Thanks for the PR, aeros167! BTW, if you want to open a new issue and modernize the tests to use importlib directly that would be great!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue19696>
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