[New-bugs-announce] [issue15079] pickle: Possibly misplaced test
report at bugs.python.org
Fri Jun 15 18:37:50 CEST 2012
New submission from Stefan M <mstefanro at gmail.com>:
After issue7455 was fixed, a test was created to reflect the fix (Lib/test/pickletester.py @ AbstractPickleModuleTests.test_bad_input). The test makes sure that an UnpicklingError is raised whenever pickled data attempts to pop on an empty stack.
Although tests on AbstractPickleModuleTests normally only run on the C implementation of pickle (on which UnpicklingError is thrown), they may also run on the Python implementation if the C implementation of pickle is not available (which throws IndexError). I'm not sure if it's still reasonable to assume that it's possible for the C implementation of pickle not to exist (the python module does), as I've discovered this by forcefully disabling the C implementation.
_pickle.UnpicklingError: unpickling stack underflow
IndexError: list assignment index out of range
The current fix involves adding IndexError to the list of exceptions that may be raised and moving the testcase to AbstractPickleTests (where the tests are ran against both the C and Python impl).
As I'm working on improving pickle in protocol v4, it might be worth considering adding more consistency to the exceptions that are being raised by the Python unpickler.
nosy: alexandre.vassalotti, collinwinter, mstefanro
title: pickle: Possibly misplaced test
versions: Python 3.4
Added file: http://bugs.python.org/file26019/pickletester.py.patch
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