.travis.yml

# Disable sudo to speed up the build
sudo: false

# Set the build language to Python
language: python

jobs:
  include:
    - name: "Python 3.6 on Xenial Linux"
      os: linux
      python: 3.6            # this works for Linux but is ignored on macOS or Windows
    - 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
  allow_failures:
    - name: "Python 3.7.4 on macOS"
      os: osx
      osx_image: xcode11.2  # Python 3.7.4 running on macOS 10.14.4
      language: shell       # 'language: python' is an error on Travis CI macOS

# all three OSes agree about 'pip3'
install:
  - pip3 install --upgrade pip
  - pip3 install -r requirements.txt
  - pip3 install mypy
  - pip3 install flake8

# 'python' points to Python 2.7 on macOS but points to Python 3.8 on Linux and Windows
# 'python3' is a 'command not found' error on Windows but 'py' works on Windows only
script:
  - python3 -m mypy --config-file=mypy.ini srudp || python -m mypy --config-file=mypy.ini srudp
  - python3 -m unittest discover || python -m unittest discover
  # stop the build if there are Python syntax errors or undefined names
  - flake8 srudp --count --select=E901,E999,F821,F822,F823 --show-source --statistics
  # exit-zero treats all errors as warnings.  PyCharm is 120 chars wide
  - flake8 srudp --count --exit-zero --max-complexity=12 --max-line-length=120 --statistics