How to run Tox with Travis-CI

Question

How do you test different Python versions with Tox from within Travis-CI?

I have a tox.ini:

[tox]
envlist = py{27,33,34,35}
recreate = True
         


        

Answer 1

TOXENV environment variable can be used to select subset of tests for each version of Python via specified matrix:

language: python
python:
  - "2.7"
  - "3.4"
  - "3.5"
env:
  matrix:
    - TOXENV=py27-django-19
    - TOXENV=py27-django-110
    - TOXENV=py27-django-111
    - TOXENV=py34-django-19
    - TOXENV=py34-django-110
    - TOXENV=py34-django-111
    - TOXENV=py35-django-19
    - TOXENV=py35-django-110
    - TOXENV=py35-django-111
install:
  - pip install tox
script:
  - tox -e $TOXENV

In tox config specify to skip missing versions of Python:

[tox]
skip_missing_interpreters=true