test_runner workflow (rsheftel/pandas_market_calendars)

The test_runner workflow from rsheftel/pandas_market_calendars, explained and optimized by Latchkey.

CI health: F - at risk

Point runs-on at Latchkey and get caching, run de-duplication, job timeouts, SHA-pinned actions, self-healing for flaky steps, and up to 58% lower cost, applied automatically.

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Source: rsheftel/pandas_market_calendars.github/workflows/test_runner.ymlLicense MITView source

What it does

This is the test_runner workflow from the rsheftel/pandas_market_calendars 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: test_runner
on:
  push:
    branches: [ dev, master ]
  pull_request:
    branches: [ dev, master ]
  workflow_call:
  workflow_dispatch:

permissions:
  contents: write  # Required for pushing commits if needed in future

jobs:
  run_tests:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        os: [ ubuntu-latest, windows-latest, macos-latest ]
        python-version: [ '3.10', '3.11', '3.12', '3.13', '3.14' ]

    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}

      - name: install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install pytest coveralls
          pip install .

      - name: run tests
        run: |
          coverage run --source=pandas_market_calendars -m pytest tests
          coverage lcov -o coverage.lcov

      - name: coveralls parallel
        uses: coverallsapp/github-action@v2
        with:
          github-token: ${{ secrets.github_token }}
          flag-name: test_${{ matrix.os }}_${{ matrix.python-version }}
          parallel: true
          file: coverage.lcov

  report_coverage:
    if: ${{ always() }}
    needs: [ run_tests ]
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: coveralls finalize
        uses: coverallsapp/github-action@v2
        with:
          github-token: ${{ secrets.github_token }}
          parallel-finished: true

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: test_runner
on:
  push:
    branches: [ dev, master ]
  pull_request:
    branches: [ dev, master ]
  workflow_call:
  workflow_dispatch:
 
permissions:
  contents: write  # Required for pushing commits if needed in future
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  run_tests:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      matrix:
        os: [ ubuntu-latest, windows-latest, macos-latest ]
        python-version: [ '3.10', '3.11', '3.12', '3.13', '3.14' ]
 
    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
    steps:
      - uses: actions/checkout@v4
 
      - uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
 
      - name: install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install pytest coveralls
          pip install .
 
      - name: run tests
        run: |
          coverage run --source=pandas_market_calendars -m pytest tests
          coverage lcov -o coverage.lcov
 
      - name: coveralls parallel
        uses: coverallsapp/github-action@v2
        with:
          github-token: ${{ secrets.github_token }}
          flag-name: test_${{ matrix.os }}_${{ matrix.python-version }}
          parallel: true
          file: coverage.lcov
 
  report_coverage:
    timeout-minutes: 30
    if: ${{ always() }}
    needs: [ run_tests ]
    runs-on: latchkey-small
 
    steps:
      - uses: actions/checkout@v4
 
      - name: coveralls finalize
        uses: coverallsapp/github-action@v2
        with:
          github-token: ${{ secrets.github_token }}
          parallel-finished: true

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.
Cache dependency installs on the setup step so they are served from cache.
Add a job timeout so a hung step cannot burn hours of runner time.

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs

This workflow runs 2 jobs (16 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 actions/setup-python