[issue3780] No way to write unit tests for warnings

[Jean-Paul Calderone]

Jean-Paul Calderone <exarkun at divmod.com> added the comment:

I was aware of it, but I didn't realize adding an "always" filter would
make sure all warnings always got noticed.  I haven't tried changing
Twisted's use of the warnings module yet, but it looks like
`catch_warnings` will work here.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3780>
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