New submission from Bruno Oliveira <[email protected]>:
Consider this code:
import unittest
class TC(unittest.TestCase):
def test_subtest(self):
with self.subTest():
pass
tc = TC('test_subtest')
tc.run()
This works when executed, but if we change ``tc.run()`` to ``tc.debug()`` we
get the following exception:
Traceback (most recent call last):
File ".tmp\test-unittest-regression.py", line 13, in <module>
tc.debug()
File
"C:\Users\Bruno\AppData\Local\Programs\Python\Python36\lib\unittest\case.py",
line 658, in debug
getattr(self, self._testMethodName)()
File ".tmp\test-unittest-regression.py", line 7, in test_subtest
with self.subTest():
File
"C:\Users\Bruno\AppData\Local\Programs\Python\Python36\lib\contextlib.py", line
81, in __enter__
return next(self.gen)
File
"C:\Users\Bruno\AppData\Local\Programs\Python\Python36\lib\unittest\case.py",
line 512, in subTest
if not self._outcome.result_supports_subtests:
AttributeError: 'NoneType' object has no attribute
'result_supports_subtests'
Looking at the code, ``subTest`` assumes that the ``TestCase`` instance has the
``self._outcome`` atribute, which is set only by ``run()``.
----------
components: Library (Lib)
messages: 327092
nosy: Bruno Oliveira
priority: normal
severity: normal
status: open
title: unittest subTests() fails when called from debug()
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue34900>
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