.travis.yml

language: python
matrix:
  include:
    - name: "Ubuntu Focal"
      dist: focal
      addons:
        apt:
          packages:
            - imagemagick
            - libtiff-tools
            - libimage-exiftool-perl
            - poppler-utils
            - netpbm
            - ghostscript
            - mupdf-tools
            - icc-profiles-free
    - name: "python 3.8 Windows"
      os: windows
      language: shell       # 'language: python' is an error on Travis CI Windows
      before_install: choco install python imagemagick
      env: PATH=/c/Python38:/c/Python38/Scripts:$PATH
    - name: "python 3.7 MacOs"
      os: osx
      language: shell       # 'language: python' is an error on Travis CI macOS
      cache:
        directories:
          - "$HOME/Library/Caches/Homebrew"
          - "$HOME/Library/Caches/pip"
      addons:
        homebrew:
          #update: true
          packages:
            - python3
            - imagemagick
      before_install:
        - python3 -m pip install --upgrade virtualenv
        - virtualenv -p python3 --system-site-packages "$HOME/venv"
        - source "$HOME/venv/bin/activate"
install: pip install tox
script:
  - python --version
  - python -m tox