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Sun Jan 12 13:24:46 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-January/131275.html

On Sat, 11 Jan 2014 23:10:43 -0800
Ethan Furman <ethan at stoneleaf.us> wrote:
> On 01/11/2014 05:37 PM, Brett Cannon wrote:
> >
> > You're assuming the context manager is doing something magical to verify that all calls in the block raise the expected
> > exception. What you want to do is execute it in a loop::
> >
> >    for test in (...):
> >      with support.check_warnings(("automatic int conversions have been deprecated", DeprecationWarning), quiet=False):
> >        exec(test)
> 
> Well, this is test.support!  I expect magic!  ;)
> 
> Thanks for setting me straight, got it working.

Or you could, you know, use the new assertWarns():
http://docs.python.org/dev/library/unittest.html#unittest.TestCase.assertWarns

Regards

Antoine.

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[Python-Dev] test.support.check_warnings