I'm transitioning from pytest regular imports to --import-mode=importlib imports due to namespace collisions in tests. And I'm getting the following crash, no plugins installed, pytest 6.1.1 CPython 3.8.6, the issue reproduces on Mac & Linux.
Create a file named test_xx.py:
import pickle
def do_action():
pass
def test_x():
pickle.dumps(do_action)$ pytest -v --import-mode=importlib test_xx.py
==================================================== test session starts ====================================================
platform darwin -- Python 3.8.5, pytest-6.1.1, py-1.9.0, pluggy-0.13.1 -- /Users/yoav/.local/share/virtualenvs/qwer-HyU7-4uu/bin/python
cachedir: .pytest_cache
rootdir: /private/tmp/qwer
collected 1 item
test_xx.py::test_x FAILED [100%]
========================================================= FAILURES ==========================================================
__________________________________________________________ test_x ___________________________________________________________
def test_x():
> pickle.dumps(do_action)
E _pickle.PicklingError: Can't pickle <function do_action at 0x10f8aa3a0>: import of module 'test_xx' failed
test_xx.py:7: PicklingError
================================================== short test summary info ==================================================
FAILED test_xx.py::test_x - _pickle.PicklingError: Can't pickle <function do_action at 0x10f8aa3a0>: import of module 'tes...
===================================================== 1 failed in 0.05s =====================================================
Running the same code without pytest or with pytest without importlib work as expected.
pip list:
Package Version
---------- -------
attrs 20.2.0
iniconfig 1.0.1
packaging 20.4
pip 20.1.1
pluggy 0.13.1
py 1.9.0
pyparsing 2.4.7
pytest 6.1.1
setuptools 50.3.0
six 1.15.0
toml 0.10.1
wheel 0.35.1
I encountered this issue because we have tests using multiprocessing.Pool, and they fail on pickling the target function.
I'm transitioning from pytest regular imports to --import-mode=importlib imports due to namespace collisions in tests. And I'm getting the following crash, no plugins installed,
pytest 6.1.1CPython 3.8.6, the issue reproduces on Mac & Linux.Create a file named test_xx.py:
Running the same code without pytest or with pytest without importlib work as expected.
pip list:
I encountered this issue because we have tests using
multiprocessing.Pool, and they fail on pickling the target function.