Running with pytest-xdist changes sys.path #376
Description
A simple test to show sys.path (and then fail, to always see the output):
$ cat test_sys_path.py
import pprint, sys
def test_sys_path():
pprint.pprint(sys.path)
1/0
$ pip freeze
apipkg==1.5
atomicwrites==1.2.1
attrs==18.2.0
execnet==1.5.0
more-itertools==4.3.0
pluggy==0.8.0
py==1.7.0
pytest==3.10.1
pytest-forked==0.2
pytest-xdist==1.24.1
six==1.11.0
$ pytest -n 0 -q
F [100%]
=========================================================================== FAILURES ===========================================================================
________________________________________________________________________ test_sys_path _________________________________________________________________________
def test_sys_path():
pprint.pprint(sys.path)
> 1/0
E ZeroDivisionError: division by zero
test_sys_path.py:5: ZeroDivisionError
--------------------------------------------------------------------- Captured stdout call ---------------------------------------------------------------------
['/private/var/folders/j2/gr3cj3jn63s5q8g3bjvw57hm0000gp/T/pytest_sys_path',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/bin',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python36.zip',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python3.6',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python3.6/lib-dynload',
'/usr/local/py/cpython-v3.6.7/lib/python3.6',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python3.6/site-packages']
1 failed in 0.05 seconds
$ pytest -n 1 -q
gw0 [1]
scheduling tests via LoadScheduling
F [100%]
=========================================================================== FAILURES ===========================================================================
________________________________________________________________________ test_sys_path _________________________________________________________________________
[gw0] darwin -- Python 3.6.7 /usr/local/virtualenvs/tmp-9cf2e53a94c913c/bin/python3.6
def test_sys_path():
pprint.pprint(sys.path)
> 1/0
E ZeroDivisionError: division by zero
test_sys_path.py:5: ZeroDivisionError
--------------------------------------------------------------------- Captured stdout call ---------------------------------------------------------------------
['/private/var/folders/j2/gr3cj3jn63s5q8g3bjvw57hm0000gp/T/pytest_sys_path',
'',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python36.zip',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python3.6',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python3.6/lib-dynload',
'/usr/local/py/cpython-v3.6.7/lib/python3.6',
'/usr/local/virtualenvs/tmp-9cf2e53a94c913c/lib/python3.6/site-packages']
1 failed in 0.54 seconds
The second entry in sys.path is different: without xdist, it's the bin directory of the virtualenv. With xdist, it's an empty string (current directory).
xdist shouldn't change this, it means my tests behave differently under the two scenarios.