상황

github actions에서 pytest를 실행하려고 workflow.yml을 작성함.
pytest 실행부분에서 에러가 발생함

Run pytest .
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.11.1/x64/bin/pytest", line 8, in <module>
    sys.exit(console_main())
             ^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/_pytest/config/__init__.py", line 190, in console_main
    code = main()
           ^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/_pytest/config/__init__.py", line 148, in main
    config = _prepareconfig(args, plugins)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/_pytest/config/__init__.py", line 329, in _prepareconfig
    config = pluginmanager.hook.pytest_cmdline_parse(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_manager.py", line 80, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_callers.py", line 55, in _multicall
    gen.send(outcome)
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/_pytest/helpconfig.py", line 103, in pytest_cmdline_parse
    config: Config = outcome.get_result()
                     ^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_result.py", line 60, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_callers.py", line 39, in _multicall
    res = hook_impl.function(*args)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/_pytest/config/__init__.py", line 1058, in pytest_cmdline_parse
    self.parse(args)
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/_pytest/config/__init__.py", line 1346, in parse
    self._preparse(args, addopts=addopts)
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/_pytest/config/__init__.py", line 1248, in _preparse
    self.hook.pytest_load_initial_conftests(
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_hooks.py", line 265, in __call__
    return self._hookexec(self.name, self.get_hookimpls(), kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_manager.py", line 80, in _hookexec
    return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_callers.py", line 60, in _multicall
    return outcome.get_result()
           ^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_result.py", line 60, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pluggy/_callers.py", line 39, in _multicall
    res = hook_impl.function(*args)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.1/x64/lib/python3.11/site-packages/pytest_django_dotenv/plugin.py", line 17, in pytest_load_initial_conftests
    dotenv.read_dotenv(os.path.join(virtual_env_path, f'../{early_config.getini("env_path")[0]}'))
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen posixpath>", line 76, in join
TypeError: expected str, bytes or os.PathLike object, not NoneType

시도

• env_path 관련 에러가 뜨길래 환경변수 문제인줄 알고 환경변수를 github settings에 작성함 -> 실패
• pip install할 때 뭔가 문제가 있는 줄 알고 python3.8 -m pip install ... 이런식으로 함 -> 실패

원인

github actions runner에는 이미 파이썬이 설치됨. 이미 설치된 파이썬에는 pytest가 설치되지 않았던 것 같음. 가상환경을 생성하고 activate하고 pip install을 한 뒤 pytest를 했더니 성공함

name: Django CI

on:
  push:
    branches: [ main, dev ]
  pull_request:
    branches: [ main, dev ]

env:
  SERVER_ENV: "test"
  DEBUG: ${{secrets.SECRET_KEY}}

jobs:
  test_project:
    runs-on: ubuntu-latest
    strategy:
      max-parallel: 4
      matrix:
        python-version: [3.8]
    steps:
      - uses: actions/checkout@v2
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v2
        with:
          python-version: ${{ matrix.python-version }}
      - name: Install Dependencies
        run: |
          pip install --upgrade pip
          python3.8 -m venv env
          source env/bin/activate
          pip install -r requirements.txt
          pytest .