[issue3780] No way to write unit tests for warnings

[Brett Cannon]

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

It sounds like you are trying to get around "once"/"default" rules to
see all warnings raised. Why can't you use catch_warnings() and do
``simplefilter("always")`` or use "error"? Otherwise you can force the
importing and use of the pure Python implementation of warnings if you
really want to continue to use your hacked version of warn_explicit (see
test_warnings on how to control whether the C implementation gets used
or not).

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nosy: +brett.cannon

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