#23841: TestCase.assertWarns doesn't work when using django's test runner.
----------------------------+--------------------
Reporter: Matt3o12 | Owner: nobody
Type: Bug | Status: new
Component: Python 3 | Version: 1.6
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
----------------------------+--------------------
Django's test runner (python manage.py test) doesn't seem to be supporting
TestCase.assertWarns using a freshly created project.
There is a testcase where django fails:
{{{
from unittest.case import TestCase
import warnings
class TestWarning(TestCase):
def testAssertWarns(self):
# should just pass
with self.assertWarns(UserWarning):
warnings.warn("Hello world.", UserWarning)
def testAssertWarnsRegex(self):
with self.assertWarnsRegex(UserWarning, "Hello world\."):
warnings.warn("Hello world.")
}}}
When I run `$ python manage.py test`, I always end up getting:
{{{
======================================================================
ERROR: testAssertWarns (myapp.tests.TestWarning)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/private/tmp/djago/myproj/myapp/tests.py", line 9, in
testAssertWarns
with self.assertWarns(UserWarning):
File
"/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/unittest/case.py",
line 205, in __enter__
for v in sys.modules.values():
RuntimeError: dictionary changed size during iteration
======================================================================
ERROR: testAssertWarnsRegex (myapp.tests.TestWarning)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/private/tmp/djago/myproj/myapp/tests.py", line 13, in
testAssertWarnsRegex
with self.assertWarnsRegex(UserWarning, "Hello world\."):
File
"/usr/local/Cellar/python3/3.4.2_1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/unittest/case.py",
line 205, in __enter__
for v in sys.modules.values():
RuntimeError: dictionary changed size during iteration
----------------------------------------------------------------------
}}}
When I just run `$ python -m unittest`, these two tests pass. I've tested
that on django 1.6 (using python 3.3) and django 1.7 (using python 3.3 and
3.4) and
--
Ticket URL: <https://code.djangoproject.com/ticket/23841>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.
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