[New-bugs-announce] [issue7849] Improve "test_support.check_warnings()"

[Florent Xicluna]

New submission from Florent Xicluna <laxyf at yahoo.fr>:

Currently this context manager is used in 3 different situations:
 - to silence standard warnings
 - to record warnings in a list, in order to verify them
 - to silence py3k warnings

But it does not accept any parameter, and it does not *check* if the filter is obsolete. It silence *all* warnings, blindly.

I would like to propose an enhancement of this function, which accepts a list of filters as parameters, and which verifies that there's really something to catch.
An optional boolean argument "lazy" can be used to disable the check.
  check_warnings([filter[, ...[, lazy=False]]])

Additionnally, a sister function will filter only the py3k warnings:
  check_py3k_warnings([filter[, ...[, lazy=False]]])

See the patch and its docstring for details.

Note: this context manager could be used to fix the last part of #7092

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components: Tests
messages: 98796
nosy: ezio.melotti, flox
priority: high
severity: normal
status: open
title: Improve "test_support.check_warnings()"
type: feature request
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7849>
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