New submission from Peter Hawkins <peter.hawk...@gmail.com>:
Example repro:
```
import unittest
def d():
assert 2 == 3
def c():
d()
def b():
c()
def a():
try:
b()
except Exception as e:
assert 1 == 2
class MyTest(unittest.TestCase):
def testException(self):
a()
if __name__ == '__main__':
unittest.main()
```
Example output from Python 3.9.0:
```
$ python atest.py
F
======================================================================
FAIL: testException (__main__.MyTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/private/tmp/atest.py", line 15, in a
b()
File "/private/tmp/atest.py", line 11, in b
c()
AssertionError
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/private/tmp/atest.py", line 23, in testException
a()
File "/private/tmp/atest.py", line 17, in a
assert 1 == 2
AssertionError
----------------------------------------------------------------------
Ran 1 test in 0.000s
FAILED (failures=1)
```
Too many frames have been filtered out of the `__context__` exception,
including a number of relevant frames for `c` and `d`. I believe this happens
because unittest sets a `limit` here based on the contents of the main
traceback:
https://github.com/python/cpython/blob/39dd141a4ba68bbb38fd00a65cdcff711acdafb5/Lib/unittest/result.py#L182
but that limit applies recursively to the `__context__` and `__cause__` chains,
when the intent of the limit was presumably only to filter the main exception.
----------
messages: 394865
nosy: peter.hawkins
priority: normal
severity: normal
status: open
title: unittest filters out too many assertion stack frames from context/cause
chains
versions: Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44280>
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