New issue 668: autouse fixtures break scope rules https://bitbucket.org/hpk42/pytest/issue/668/autouse-fixtures-break-scope-rules
tgoodlet: I believe this issue is very similar to [#660](https://bitbucket.org/hpk42/pytest/issue/660/module-scope-fixture-runs-on-function) The problem is easily reproduced. Say you have the following very simple test mod `test_fixture_scopes.py` ``` import pytest @pytest.fixture def func_level(request): return 'blah' @pytest.fixture(scope='session') def sess_level(func_level): return func_level def test_fscopes(sess_level): print sess_level ``` As expected this fixture chain breaks scope rules: ``` $ py.test --tb=short ./test_fixture_scopes ============================================================================================================= test session starts ========================== platform linux2 -- Python 2.7.9 -- py-1.4.26 -- pytest-2.6.4 -- /usr/bin/python2 plugins: interactive, ordering, ipdb collected 1 items test_fixture_scopes.py::test_fscopes ERROR =================================================================================================================== ERRORS ========================== _______________________________________________________________________________________________________ ERROR at setup of test_fscopes ________________________________________________________________________________________________________ /usr/lib/python2.7/site-packages/_pytest/runner.py:139: in __init__ self.result = func() /usr/lib/python2.7/site-packages/_pytest/runner.py:127: in <lambda> return CallInfo(lambda: ihook(item=item, **kwds), when=when) /usr/lib/python2.7/site-packages/_pytest/main.py:167: in call_matching_hooks return hookmethod.pcall(plugins, **kwargs) /usr/lib/python2.7/site-packages/_pytest/core.py:417: in pcall return self._docall(methods, kwargs) /usr/lib/python2.7/site-packages/_pytest/core.py:424: in _docall res = mc.execute() /usr/lib/python2.7/site-packages/_pytest/core.py:315: in execute res = method(**kwargs) /usr/lib/python2.7/site-packages/_pytest/runner.py:86: in pytest_runtest_setup item.session._setupstate.prepare(item) /usr/lib/python2.7/site-packages/_pytest/runner.py:393: in prepare col.setup() /usr/lib/python2.7/site-packages/_pytest/python.py:1141: in setup fillfixtures(self) /usr/lib/python2.7/site-packages/_pytest/python.py:667: in fillfixtures request._fillfixtures() /usr/lib/python2.7/site-packages/_pytest/python.py:1289: in _fillfixtures item.funcargs[argname] = self.getfuncargvalue(argname) /usr/lib/python2.7/site-packages/_pytest/python.py:1337: in getfuncargvalue return self._get_active_fixturedef(argname).cached_result[0] /usr/lib/python2.7/site-packages/_pytest/python.py:1351: in _get_active_fixturedef result = self._getfuncargvalue(fixturedef) /usr/lib/python2.7/site-packages/_pytest/python.py:1403: in _getfuncargvalue val = fixturedef.execute(request=subrequest) /usr/lib/python2.7/site-packages/_pytest/python.py:1825: in execute fixturedef = request._get_active_fixturedef(argname) /usr/lib/python2.7/site-packages/_pytest/python.py:1351: in _get_active_fixturedef result = self._getfuncargvalue(fixturedef) E ScopeMismatchError: You tried to access the 'function' scoped fixture 'func_level' with a 'session' scoped request object, involved factories E test_fixture_scopes.py:3: def sess_level(func_level) E test_fixture_scopes.py:8: def func_level(request) =========================================================================================================== 1 error in 0.04 seconds ========================== ``` But now add a sibling autouse fixture which consumes `sess_level` to the same file: ```python @pytest.fixture(autouse=True) def always(func_level): print func_level ``` Run again and the scope mismatch error dissappears? ``` $ py.test --tb=short ./test_fixture_scopes ============================================================================================================= test session starts ================================================================= platform linux2 -- Python 2.7.9 -- py-1.4.26 -- pytest-2.6.4 -- /usr/bin/python2 plugins: interactive, ordering, ipdb collected 1 items test_fixture_scopes.py::test_fscopes blah blah PASSED ========================================================================================================== 1 passed in 0.01 seconds ======================== ``` This caused some very unexpected results for me since the scoped `sess_level` will be retriggered for every consuming test once the autouse sibling is added. Since there was no error and I am dealing with a large fixture set, I was unaware that I was breaking scope rules and instead saw odd fixture execution orders. _______________________________________________ pytest-commit mailing list pytest-commit@python.org https://mail.python.org/mailman/listinfo/pytest-commit
