[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[STINNER Victor]

Change by STINNER Victor :


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nosy:  -vstinner

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[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[Nick Coghlan]

Nick Coghlan  added the comment:

Closing the old one as partially fixed, and linking here as a superseder makes 
sense to me, so I went ahead and did that.

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[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Nick and/or Victor: should this be closed in favor of #15626? or should the 
latter be closed as mostly fixed, with this being left open as a followup?

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nosy: +terry.reedy, vstinner
versions:  -Python 3.6, Python 3.7

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[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

Seems to be a duplicate of https://bugs.python.org/issue15626. See also 
https://bugs.python.org/issue31975

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[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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nosy: +xtreak

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[issue42186] unittest overrides more serious warnings filter added before unittest.main()

[Yilei Yang]

New submission from Yilei Yang :

Because unittest adds a `default` filter before tests run, other warnings 
filters are overridden if added before.

Ideally, unittest should not make the warnings less serious, e.g. if there is 
already an 'error' filter that raises exception, it shouldn't "downgrade" to 
'default' that simply prints.

The following example, using lib.a_function() raises exception in a regular 
program, but the unit test passes:

$ cat lib.py
import warnings
class MyWarning(UserWarning):
pass
warnings.filterwarnings('error', category=MyWarning)
def a_function():
  warnings.warn('Do not use.', MyWarning)

$ cat lib_test.py
import unittest
import lib
class TestLib(unittest.TestCase):
def test_function(self):
lib.a_function()
if __name__ == '__main__':
unittest.main()

$ python -m unittest -v lib_test
test_function (lib_test.TestLib) ... lib.py:6: MyWarning: Do not use.
  warnings.warn('Do not use.', MyWarning)
ok

--
Ran 1 test in 0.000s

OK

$ python
>>> import lib
>>> lib.a_function()
Traceback (most recent call last):
  File "", line 1, in 
  File "lib.py", line 6, in a_function
warnings.warn('Do not use.', MyWarning)
lib.MyWarning: Do not use.

--
components: Library (Lib)
messages: 379843
nosy: yilei
priority: normal
severity: normal
status: open
title: unittest overrides more serious warnings filter added before 
unittest.main()
type: behavior
versions: Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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