pytest fails to import modules even though these modules import fine under the vanilla python interpreter. Especially modules imported from conftest fails to resolve. ImportErrori is raised when pytest tries to rewrite assert information in modules.
An example traceback:
================================================================================================================================================ test session starts ================================================================================================================================================
platform darwin -- Python 3.6.2, pytest-3.8.1, py-1.5.4, pluggy-0.7.1 -- /yyy/venv/bin/python3.6
cachedir: .pytest_cache
rootdir: /yyy/corporategovernance, inifile: setup.cfg
plugins: timeout-1.3.1, cov-2.5.1, populus-1.9.0, flaky-3.4.0, celery-4.1.0, splinter-1.8.5+headless
collecting 0 items / 1 errors
====================================================================================================================================================== ERRORS =======================================================================================================================================================
_________________________________________________________________________________________________________________________________ ERROR collecting corporategovernance/__init__.py __________________________________________________________________________________________________________________________________
../venv/lib/python3.6/site-packages/_pytest/config/__init__.py:381: in _getconftestmodules
return self._path2confmods[path]
E KeyError: local('/xxx/tests')
During handling of the above exception, another exception occurred:
../venv/lib/python3.6/site-packages/_pytest/config/__init__.py:412: in _importconftest
return self._conftestpath2mod[conftestpath]
E KeyError: local('/xxx/tests/conftest.py')
During handling of the above exception, another exception occurred:
../venv/lib/python3.6/site-packages/_pytest/config/__init__.py:418: in _importconftest
mod = conftestpath.pyimport()
../venv/lib/python3.6/site-packages/py/_path/local.py:668: in pyimport
__import__(modname)
../venv/lib/python3.6/site-packages/_pytest/assertion/rewrite.py:290: in load_module
six.exec_(co, mod.__dict__)
corporategovernance/tests/conftest.py:4: in <module>
import corporategovernance.backend
E ModuleNotFoundError: No module named 'corporategovernance.backend'
During handling of the above exception, another exception occurred:
../venv/lib/python3.6/site-packages/_pytest/runner.py:201: in __init__
self.result = func()
../venv/lib/python3.6/site-packages/_pytest/runner.py:261: in <lambda>
call = CallInfo(lambda: list(collector.collect()), "collect")
../venv/lib/python3.6/site-packages/_pytest/python.py:624: in collect
for x in self._collectfile(path):
../venv/lib/python3.6/site-packages/_pytest/python.py:579: in _collectfile
ihook = self.gethookproxy(path)
../venv/lib/python3.6/site-packages/_pytest/python.py:568: in gethookproxy
my_conftestmodules = pm._getconftestmodules(fspath)
../venv/lib/python3.6/site-packages/_pytest/config/__init__.py:395: in _getconftestmodules
mod = self._importconftest(conftestpath)
../venv/lib/python3.6/site-packages/_pytest/config/__init__.py:431: in _importconftest
raise ConftestImportFailure(conftestpath, sys.exc_info())
E _pytest.config.ConftestImportFailure: ModuleNotFoundError("No module named 'corporategovernance.backend'",)
E File "/yyy/venv/lib/python3.6/site-packages/_pytest/assertion/rewrite.py", line 290, in load_module
E six.exec_(co, mod.__dict__)
E File "/xxx/tests/conftest.py", line 4, in <module>
E import corporategovernance.backend
===Flaky Test Report===
How to resolve?
pytest may be picky if you have __init__.py files under your tests folder and subfolders. This may cause pytest to resolve Python modules in incorrect order under certain circumstances.
The workaround is to remove all __init__.py files under tests.
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