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https://docs.pytest.org/en/stable/how-to/existingtestsuite.html This makes setting `PYTHONPATH` unnecessary and will pull requirements from `pyproject.toml` instead of `requirements.txt`, so it is similar to end-user installations. `makedir -p data/plugins` will do both `mkdir data` and `mkdir data/plugins`. The `$CI` environment variable might be better to use than `$TESTING` because it is preset to `true` in GitHub Actions. * https://docs.github.com/en/actions/reference/variables-reference#default-environment-variables * https://docs.pytest.org/en/stable/explanation/ci.html