[issue37890] Modernize several tests in test_importlib

[Brett Cannon]

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

What Serhiy said. :) There's code to be able to easily test both builtins.__import__ and importlib.__import__ in tests so that there's no drift between the two implementations.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37890>
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