.travis.yml

language: python            # this works for Linux but is an error on macOS or Windows
jobs:
  include:
    - name: "Python 3.8.0 on Xenial Linux"
      python: 3.8           # this works for Linux but is ignored on macOS or Windows
    - name: "Python 3.7.4 on macOS"
      os: osx
      osx_image: xcode11.5
      language: shell       # 'language: python' is an error on Travis CI macOS
    - name: "Python 3.7.0 on Windows"
      os: windows           # Windows 10.0.17134 N/A Build 17134
      language: shell       # 'language: python' is an error on Travis CI Windows
      before_install:
        - choco install python --version 3.8.0
        - python -m pip install --upgrade pip setuptools wheel
        - pip install torch==1.5.0+cpu torchvision==0.6.0+cpu -f https://download.pytorch.org/whl/torch_stable.html
      env: PATH=/c/Python38:/c/Python38/Scripts:$PATH
install:
  - pip3 install --upgrade pip  # all three OSes agree about 'pip3'
  - pip3 install "."
  - pip3 install coverage
script:
  - coverage run setup.py test
  - bash <(curl -s https://codecov.io/bash)