py.test 没有从 conftest 正确导入模块 - 因 ConftestImportFailure: ModuleNotFound 而失败

Question

pytest即使这些模块在 vanillapython解释器下导入正常，也无法导入模块。特别是从导入的模块conftest无法解析。当 pytest 尝试重写模块中的断言信息时，会引发 ImportErrori。

一个示例回溯：

================================================================================================================================================ 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===

如何解决？

Answer 1

如果您的文件夹和子文件夹__init__.py下有文件，pytest 可能会很挑剔。tests在某些情况下，这可能会导致 pytest 以错误的顺序解析 Python 模块。

解决方法是删除所有__init__.py正在测试的文件。