stages:
- "test"

before_script:
- python -V
- pip install wheel tox

test-3.5:
  image: python:3.5-stretch
  script:  
  - tox -e py35

test-3.6:
  image: python:3.6-stretch
  script:  
  - tox -e py36

test-3.7:
  image: python:3.7-stretch
  script:  
  - tox -e py37