#29023: running tests in parallel doesn't show exception chain (even with tblib)
-------------------------------------+-------------------------------------
Reporter: Chris | Owner: nobody
Jerdonek |
Type: | Status: new
Cleanup/optimization |
Component: Testing | Version: master
framework | Keywords:
Severity: Normal |
parallel,exception,chain,traceback,pickling,tblib
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
-------------------------------------+-------------------------------------
Running tests in parallel doesn't show more than the first link of an
exception chain. For example, with the following test (with `tblib`
installed):
{{{#!python
def test(self):
time.sleep(2)
try:
raise ValueError('foo')
except Exception:
raise KeyError('bar')
}}}
this is what the failure looks like when running tests in parallel:
{{{
Traceback (most recent call last):
File "/Users/.../versions/3.6.4/lib/python3.6/unittest/case.py", line
59, in testPartExecutor
yield
File "/Users/.../versions/3.6.4/lib/python3.6/unittest/case.py", line
605, in run
testMethod()
File "/Users/.../myproject/myproject/tests/test_a.py", line 13, in test2
raise KeyError('bar')
KeyError: 'bar'
}}}
In contrast, this is what it looks like when running them not in parallel:
{{{
Traceback (most recent call last):
File "/Users/.../myproject/myproject/tests/test_a.py", line 11, in test2
raise ValueError('foo')
ValueError: foo
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/Users/.../myproject/myproject/tests/test_a.py", line 13, in test2
raise KeyError('bar')
KeyError: 'bar'
}}}
Side question: why must pickling be used at all? Why can't we simply
render the traceback to a string using Python's `traceback` module, and
then send the string back? It seems like that would result in simpler,
more understandable code and sidestep many of the difficulties.
(This was reported using Python 3.6.4. and `master` as of Jan. 15, 2018:
02365d3f38a64a5c2f3e932f23925a381d5bb151 .)
--
Ticket URL: <https://code.djangoproject.com/ticket/29023>
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