tox-gh

tox-gh is a tox plugin which helps running tox on GitHub Actions with multiple different Python versions on multiple workers in parallel.

Features

When running tox on GitHub Actions, tox-gh

• detects which environment to run based on configurations (or bypass detection and set it explicitly via the TOX_GH_MAJOR_MINOR environment variable) and
• provides utilities such as grouping log lines.

Usage

1. Add configurations under [gh] section along with your tox configuration.
2. Install tox-gh package in the GitHub Actions workflow before running tox command.

Examples

Basic Example

Add [gh] section to the same file as tox configuration. If you're using tox.ini:

[gh]
python =
    3.8 = 3.8
    3.9 = 3.9
    3.10 = 3.10
    3.11 = 3.11
    3.12 = 3.12
    3.13 = 3.13, type, dev, pkg_meta

This will run different set of tox environments on different python versions set up via GitHub setup-python action:

• on Python 3.8 job, tox runs py38 environment,
• on Python 3.9 job, tox runs py39 environment,
• on Python 3.10 job, tox runs py310 environment,
• in Python 3.11 job, tox runs py311 and type environments,
• on Python 3.12 job, tox runs py312 environment.

Workflow Configuration

.github/workflows/check.yaml:

name: check
on:
  workflow_dispatch:
  push:
    branches: ["main"]
    tags-ignore: ["**"]
  pull_request:
  schedule:
    - cron: "0 8 * * *"

concurrency:
  group: check-${{ github.ref }}
  cancel-in-progress: true

jobs:
  test:
    name: test with ${{ matrix.env }} on ${{ matrix.os }}
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        env:
          - "3.13"
          - "3.12"
          - "3.11"
          - "3.10"
          - "3.9"
          - "3.8"
        os:
          - ubuntu-latest
          - macos-latest
          - windows-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Install the latest version of uv
        uses: astral-sh/setup-uv@v3
        with:
          enable-cache: true
          cache-dependency-glob: "pyproject.toml"
          github-token: ${{ secrets.GITHUB_TOKEN }}
      - name: Add .local/bin to Windows PATH
        if: runner.os == 'Windows'
        shell: bash
        run: echo "$USERPROFILE/.local/bin" >> $GITHUB_PATH
      - name: Install tox
        run: uv tool install --python-preference only-managed --python 3.13 tox --with tox-uv --with tox-gh
      - name: Install Python
        if: matrix.env != '3.13'
        run: uv python install --python-preference only-managed ${{ matrix.env }}
      - name: Setup test suite
        run: tox run -vv --notest --skip-missing-interpreters false
        env:
          TOX_GH_MAJOR_MINOR: ${{ matrix.env }}
      - name: Run test suite
        run: tox run --skip-pkg-install
        env:
          TOX_GH_MAJOR_MINOR: ${{ matrix.env }}

FAQ

• When a list of environments to run is specified explicitly via -e option or TOXENV environment variable tox-gh respects the given environments and simply runs the given environments without enforcing its configuration.
• The plugin only activates if the environment variable GITHUB_ACTIONS is true.