[Django]-Django + tox: Apps aren't loaded yet

Django doesn’t know how to run pytest-style test functions. Plain pytest also doesn’t provide a django integration. You can either

• write a custom test runner (a minimal example):

  # myapp/runner.py
  
  class PytestRunner:
      def run_tests(self, test_labels):
          import pytest    
          return pytest.main(test_labels)
  

  and configure your app to use it instead of the default DiscoverRunner:

  # myapp/settings.py
  TEST_RUNNER = 'myapp.runner.PytestRunner'
  

  Now python manage.py test will invoke pytest instead of the default unittest.

• Or use the pytest-django plugin. Add it to deps:

  deps =
      ...
      pytest
      pytest-django
      ...
  

  This doesn’t provide integration with manage.py test per se, but you will be able to invoke tests as usual via pytest:

  $ pytest --ds=myapp.settings
  ...
  

  The plugin also provides many useful fixtures that reimplement Django’s test helpers (like RequestFactory, Client etc) so you can do a complete port of the unittest-style test classes to pytest-style test functions. Refer to pytest-django docs for configurations details and code examples.