language: python
env:
  - TESTING_ON_TRAVIS=1
matrix:
  include:
    - name: "Python 3.7 on Xenial Linux"
      python: 3.7
    - name: "Python 3.7 on macOS"
      os: osx
      osx_image: xcode11
      language: shell
    - name: "Python 3.7 on Windows"
      os: windows
      language: shell
      before_install:
        - choco install python
        - python -m pip install --upgrade pip
      env:
        - PATH=/c/Python37:/c/Python37/Scripts:$PATH
        - TESTING_ON_TRAVIS=1
script: python3 tests.py || python tests.py