Auto-chose platform (or other) condition in tox sections

Question

I want to specifically run a certain tox section which then auto-decides on the specific platform. The example code-snippet below works fine if I just ran tox -e ALL

Answer 1

You could give the tox-factor plugin a try.

For example:

tox.ini

[tox]
envlist =
    alpha-{redmond,tux}
    bravo-{redmond,tux}
requires =
    tox-factor
skipsdist = true

[testenv]
commands =
    python -c 'import sys; print("platform", sys.platform)'
platform =
    redmond: win32
    tux: linux

This gives the following four environments:

$ tox --listenvs
alpha-redmond
alpha-tux
bravo-redmond
bravo-tux

That can be selected according to the factors:

$ tox --listenvs --factor tux
alpha-tux
bravo-tux
$ tox --listenvs --factor alpha
alpha-redmond
alpha-tux

And then run like this (for example on a Linux platform):

$ tox --factor bravo
bravo-tux run-test-pre: PYTHONHASHSEED='1770792708'
bravo-tux run-test: commands[0] | python -c 'import sys; print("platform", sys.platform)'
platform linux
________________________________________________ summary ________________________________________________
SKIPPED:  bravo-redmond: platform mismatch ('linux' does not match 'win32')
  bravo-tux: commands succeeded
  congratulations :)

References:

• https://github.com/tox-dev/tox/issues/1338
• https://pypi.org/project/tox-factor/