Internal error encountered even with an empty test

[roastduck]

I failed to run even an empty test case.

The output is:

========================================================= test session starts =========================================================
platform linux -- Python 3.5.2, pytest-4.4.0, py-1.8.0, pluggy-0.9.0
rootdir: /home/rd/tmp
plugins: mp-0.0.4, hypothesis-3.44.23
collected 1 item
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/_pytest/main.py", line 209, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/_pytest/main.py", line 249, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pluggy/hooks.py", line 289, in __call__
INTERNALERROR>     return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pluggy/manager.py", line 68, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pluggy/manager.py", line 62, in <lambda>
INTERNALERROR>     firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pluggy/callers.py", line 208, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pluggy/callers.py", line 80, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pluggy/callers.py", line 187, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pytest_mp/plugin.py", line 328, in pytest_runtestloop
INTERNALERROR>     batches = batch_tests(session)
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pytest_mp/plugin.py", line 149, in batch_tests
INTERNALERROR>     group_name, group_strategy = get_item_batch_name_and_strategy(item)
INTERNALERROR>   File "/home/rd/.local/lib/python3.5/site-packages/pytest_mp/plugin.py", line 115, in get_item_batch_name_and_strategy
INTERNALERROR>     marker = item.get_marker('mp_group')
INTERNALERROR> AttributeError: 'Function' object has no attribute 'get_marker'

==================================================== no tests ran in 0.02 seconds =====================================================

There's only test_search.py and an empty __init__.py in the directory test.

The content of test/test_search.py is:

def test_foo():
    pass

[kdelee]

@roastduck can you tell me your python version and pytest version? I believe this is related to updates made to get up to date with pytest 4.0+
Also see jlaska/pytest-github#24 (comment)

[roastduck]

I'm using PyTest 4.4.0, so it's not the problem. The detailed version string is:

This is pytest version 4.4.0, imported from /home/rd/.local/lib/python3.5/site-packages/pytest.py
setuptools registered plugins:
  hypothesis-3.44.23 at /home/rd/.local/lib/python3.5/site-packages/hypothesis/extra/pytestplugin.py

[kdelee]

I am not able to reproduce @roastduck.
Also, not sure why pytest-mp is not in your list of registered plugins. Did you pip install it?

Here's my workflow:

virtualenv -p python3 ~/venvs/testpytestmp
source ~/venvs/testpytestmp/bin/activate
git clone git@github.com:ansible/pytest-mp.git
pip install -e pytest-mp
echo -e "def test_foo():\n    assert True" > test.py
py.test test.py

My output of py.test --version:

This is pytest version 4.5.0, imported from /home/elijah/venvs/testpytestmp/lib/python3.7/site-packages/pytest.py
setuptools registered plugins:
  pytest-mp-0.0.4 at /home/elijah/sfw/ansible/pytest-mp/pytest_mp/plugin.py

I now do see in your original comment that you were using a more up to date version of pytest. Have you attemped a fresh install of pytest-mp from git?

[roastduck]

pytest-mp was missing from what I posted above. It was simply because I found pytest-mp not working and uninstalled it.

The problematic version was installed via pip. Now I installed the git version and all things work fine. Maybe the problem was within pip and maybe not. Anyway thank you for your help. I'm closing this issue.