black:
    image: python:latest
    stage: quality
    script:
        - python --version  # Debug
        - python -m venv venv --upgrade-deps || python -m venv venv
        - source venv/bin/activate
        - pip install black
        - black . --check --diff --quiet
    only:
        changes:
            - src/**/*.py
            - tests/**/*.py
            - .gitlab-ci.yml
            - pyproject.toml