Continuous Integration workflow (simplistix/testfixtures)

The Continuous Integration workflow from simplistix/testfixtures, explained and optimized by Latchkey.

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Source: simplistix/testfixtures.github/workflows/ci.ymlLicense MITView source

What it does

This is the Continuous Integration workflow from the simplistix/testfixtures repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: "Continuous Integration"

on:
  push:
    branches: [main]
  pull_request:
  schedule:
    - cron: "0 1 * * *"

jobs:
  tests:
    name: "tests / python ${{ matrix.python-version }} / ${{ matrix.uv-resolution }} ${{ matrix.extra}}"
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        python-version:
          - "3.11"
          - "3.14"
        uv-resolution:
          - "lowest-direct"
          - "highest"
        extra:
          - ""
          - "--all-extras --all-groups"
        include:
          # Now test each of the extras individually
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra django --group django-dev"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra mock-backport"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra sybil"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra loguru"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra polars"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra pandas --group pandas-dev"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra numpy"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra structlog"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra pydantic"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra twisted --group twisted-dev"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra yaml"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra toml"
    steps:
      - uses: cjw296/python-action/run-tests@v3
        with:
          python-version: ${{ matrix.python-version }}
          uv-params: "--dev ${{ matrix.extra }} --resolution ${{ matrix.uv-resolution }}"

  coverage:
    needs: tests
    runs-on: ubuntu-latest
    steps:
      - uses: cjw296/python-action/check-coverage@v3

  typing:
    name: type checking / python ${{ matrix.python-version }}
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version:
          - "3.11"
          - "3.14"
    steps:
      - uses: cjw296/python-action/check-typing@v3
        with:
          python-version: ${{ matrix.python-version }}
          uv-params: "--all-groups --all-extras"

  build-and-inspect-package:
    needs:
      - coverage
      - tests
      - typing
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: hynek/build-and-inspect-python-package@v2

  check-package:
    needs:
      - build-and-inspect-package
    runs-on: ubuntu-latest
    strategy:
      matrix:
        extra:
          - ""
          - "django"
          - "loguru"
          - "polars"
          - "pandas"
          - "numpy"
          - "sybil"
          - "mock"
          - "structlog"
          - "pydantic"
          - "twisted"
    steps:
      - uses: cjw296/python-action/check-distributions@v3
        with:
          package: "testfixtures"
          python-version: "3.14"
          extras: ${{ matrix.extra == 'mock' && '[mock-backport]' || (matrix.extra && format('[{0}]', matrix.extra) || '') }}
          checks: ${{ matrix.extra && format('python -c "import testfixtures.{0}"', matrix.extra) || 'python -c "import testfixtures"' }}

  all-green:
    if: always()
    needs:
      - check-package
    runs-on: ubuntu-latest
    steps:
      - uses: re-actors/alls-green@release/v1
        with:
          jobs: ${{ toJSON(needs) }}

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: "Continuous Integration"
 
on:
  push:
    branches: [main]
  pull_request:
  schedule:
    - cron: "0 1 * * *"
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  tests:
    timeout-minutes: 30
    name: "tests / python ${{ matrix.python-version }} / ${{ matrix.uv-resolution }} ${{ matrix.extra}}"
    runs-on: latchkey-small
    strategy:
      fail-fast: false
      matrix:
        python-version:
          - "3.11"
          - "3.14"
        uv-resolution:
          - "lowest-direct"
          - "highest"
        extra:
          - ""
          - "--all-extras --all-groups"
        include:
          # Now test each of the extras individually
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra django --group django-dev"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra mock-backport"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra sybil"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra loguru"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra polars"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra pandas --group pandas-dev"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra numpy"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra structlog"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra pydantic"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra twisted --group twisted-dev"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra yaml"
          - python-version: "3.14"
            uv-resolution: "highest"
            extra: "--extra toml"
    steps:
      - uses: cjw296/python-action/run-tests@v3
        with:
          python-version: ${{ matrix.python-version }}
          uv-params: "--dev ${{ matrix.extra }} --resolution ${{ matrix.uv-resolution }}"
 
  coverage:
    timeout-minutes: 30
    needs: tests
    runs-on: latchkey-small
    steps:
      - uses: cjw296/python-action/check-coverage@v3
 
  typing:
    timeout-minutes: 30
    name: type checking / python ${{ matrix.python-version }}
    runs-on: latchkey-small
    strategy:
      matrix:
        python-version:
          - "3.11"
          - "3.14"
    steps:
      - uses: cjw296/python-action/check-typing@v3
        with:
          python-version: ${{ matrix.python-version }}
          uv-params: "--all-groups --all-extras"
 
  build-and-inspect-package:
    timeout-minutes: 30
    needs:
      - coverage
      - tests
      - typing
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v4
      - uses: hynek/build-and-inspect-python-package@v2
 
  check-package:
    timeout-minutes: 30
    needs:
      - build-and-inspect-package
    runs-on: latchkey-small
    strategy:
      matrix:
        extra:
          - ""
          - "django"
          - "loguru"
          - "polars"
          - "pandas"
          - "numpy"
          - "sybil"
          - "mock"
          - "structlog"
          - "pydantic"
          - "twisted"
    steps:
      - uses: cjw296/python-action/check-distributions@v3
        with:
          package: "testfixtures"
          python-version: "3.14"
          extras: ${{ matrix.extra == 'mock' && '[mock-backport]' || (matrix.extra && format('[{0}]', matrix.extra) || '') }}
          checks: ${{ matrix.extra && format('python -c "import testfixtures.{0}"', matrix.extra) || 'python -c "import testfixtures"' }}
 
  all-green:
    timeout-minutes: 30
    if: always()
    needs:
      - check-package
    runs-on: latchkey-small
    steps:
      - uses: re-actors/alls-green@release/v1
        with:
          jobs: ${{ toJSON(needs) }}

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Cancel superseded runs when a branch or PR gets a newer push.
Add a job timeout so a hung step cannot burn hours of runner time.

3 third-party actions are referenced by a movable tag. Pin them to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

This workflow runs 6 jobs (24 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout