Couldn't run tests

I've just cloned repo, installed dev requirements to venv and tried to run `pytest`

Error message: `ImportError: Couldn't import Django. Are you sure it's installed and available on your PYTHONPATH environment variable? Did you forget to activate a virtual environment?`

```
platform win32 -- Python 3.11.1, pytest-7.2.0, pluggy-1.0.0
django: settings: testproject.settings (from env)
rootdir: C:\Users\leoni\source\repos\django-sass, configfile: setup.cfg
plugins: cov-4.0.0, django-4.5.2
collected 8 items

testproject\tests.py FFFFs..F
```