.travis.yml

language: python
jobs:
  include:
    - name: "Python 3.8.0 on Xenial Linux"
      python: 3.8
    - name: "Python 3.6.10 on FreeBSD"
      os: freebsd
      language: python
    - name: "Python 3.7.4 on macOS"
      os: osx
      osx_image: xcode11.2
      language: shell 
    - name: "Python 3.8.0 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
      env: PATH=/c/Python38:/c/Python38/Scripts:$PATH
install: 
  - pip3 install --upgrade pip  # all three OSes agree about 'pip3'
  - pip install Jinja2==3.0.0 watchdog==2.1.2
  - pip install --user codecov
script: python3 tests || python tests
after_success:
  - codecov -t