Already imported module

[keller00]

Hey!
I'm trying to migrate over my tests from nose to pytest to test my twisted application.

This site says:
If a plugin is installed, pytest automatically finds and integrates it, there is no need to activate it.
So according to this all I have to do is pip install pytest-twisted, but when I try running my tests I get:
AttributeError: 'module' object has no attribute 'inlineCallbacks'

So on this site it says to put the following into conftest.py:
pytest_plugins = "pytest_twisted"
So I make conftest.py next to my testing Python file in the tests folder and get the following warning:

None
  Module already imported so can not be re-written: pytest_twisted

-- Docs: http://doc.pytest.org/en/latest/warnings.html

It seems like it auto discovers the plugin, but doesn't update itself with inlinecallback without reimporting it? Would this be a bug, or just me not understanding something properly?

Any help is appreciated! Thank you!

[RonnyPfannschmidt]

there is certain places at which things can be availiable, without knowing your code its not clear how oyu use things together

[keller00]

Okay, then. Here is part of my code:
So let's say that I have:
twisted_ap
├── tests
│     └── test_rtc_master.py
└── coordinator
    └── rtc_master.py
Edit: I'm not going to show the other files.
Where test_rtc_master.py looks like this:

#!/usr/bin/env python2.7
import pytest, requests
from ..coordinator.rtc_master import RtcMaster

IP = '127.0.0.1'
EXTENSION = '/rtc'

class TestRtcMaster(object):
    # See https://docs.pytest.org/en/latest/fixture.html to learn about fixtures
    @pytest.fixture(scope='class', autouse=True)
    # NOTE: setting the scope to class lets us only create the rtc master once and pass that around to
    #   all of the functions
    def rtc_master(self):
        """ Fixture for creating a Rtc Master """
        assert requests.get('https://' + IP + '/rtc/info', verify=False, timeout=2).status_code == 200
        return RtcMaster('127.0.0.1', '/rtc')

    def test_init(self, rtc_master):
        """ Check if RtcMaster was created """
        assert rtc_master
        assert isinstance(rtc_master, RtcMaster)

    @pytest.inlineCallbacks
    def test_list_streams(self, rtc_master):
        """ Check if RtcMaster was created """
        stream_list = yield rtc_master.list_rtc_streams()
        assert isinstance(stream_list, list)

[nicoddemus]

@keller00 how's your environment? You should not have to use pytest_plugins if you are using a virtual environment and pip it should be detected and activated automatically.

[keller00]

@nicoddemus I'm not using a virtual environment. It is detected automatically as you can see here:

=============================== test session starts ===============================
platform linux2 -- Python 2.7.12, pytest-3.3.0, py-1.5.2, pluggy-0.6.0
rootdir: /home/mark/twisted_ap/, inifile:
plugins: twisted-1.5
collected 8 items / 1 errors                                                      

===================================== ERRORS ======================================
___________________ ERROR collecting tests/test_rtc_master.py ___________________
tests/test_rtc_master.py:8: in <module>
    class TestRtcMaster(object):
tests/test_rtc_master.py:23: in TestRtcMaster
    @pytest.inlineCallbacks
E   AttributeError: 'module' object has no attribute 'inlineCallbacks'
!!!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!!
============================= 1 error in 0.48 seconds =============================

[nicoddemus]

Are you passing --twisted on the command line? I suggest to do that or add to the pytest.ini file:

[pytest]
twisted=1

Adding pytest_plugins to the conftest.py only works if you add it to your root conftest.py file. Anyway I suggest adding to pytest.ini as this is the simplest option IMHO.

[keller00]

Okay, I that fixes the problem. Thank you!
Is it not a bit counter intuitive when pytest reports the plugin, but it is not active?

[nicoddemus]

It is active, but for some reason the callbacks are only available if explicitly sets that "twisted" flag... not sure why pytest-twisted authors decided to do that: https://github.com/pytest-dev/pytest-twisted/blob/master/pytest_twisted/__init__.py#L19

[keller00]

Okay, thanks! I'll bug them with my question.