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Tests workflow (mar10/pyftpsync)

The Tests workflow from mar10/pyftpsync, explained and optimized by Latchkey.

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Source: mar10/pyftpsync.github/workflows/python-app.ymlLicense MITView source

What it does

This is the Tests workflow from the mar10/pyftpsync 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)
# This workflow will install Python dependencies, run tests and lint with a single version of Python
# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python

name: Tests

on:
  push:
    branches: ["master"]
  pull_request:
    branches: ["master"]

permissions:
  contents: read

jobs:
  build:
    runs-on: ubuntu-latest

    strategy:
      fail-fast: false
      matrix:
        # Python 3.7  # EOL 2023-06-27
        # Python 3.8  # EOL 2024-10-14
        # Python 3.9  # EOL 2025-10-05
        # Python 3.10 # EOL 2026-10-04
        # Python 3.11 # EOL 2027-10-24
        # Python 3.12 # EOL 2028-10-31
        # Python 3.13 # EOL 2029-10-31
        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v3
        with:
          python-version: ${{ matrix.python-version }}

      - name: Install dependencies
        run: |
          python -V
          python -m pip install --upgrade pip
          python -m pip install setuptools
          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
          python -m pip install pytest pytest-cov pytest-html ruff 
          # python -m pip install 
          pip list

      - name: Lint with ruff
        run: |
          ruff -V
          ruff check ftpsync tests setup.py

      - name: Test with pytest
        run: |
          pytest -V
          pytest -ra -v -x --durations=10 --cov=ftpsync
          # pytest -ra -v -x --durations=10 --cov=ftpsync --html=build/pytest/report-${{ matrix.python-version }}.html --self-contained-html
          # pytest -ra -v -x --durations=10 --cov=ftpsync --html=build/pytest/report-{envname}.html --self-contained-html {posargs}

      - name: Upload coverage reports to Codecov
        uses: codecov/codecov-action@v4.0.1
        with:
          token: ${{ secrets.CODECOV_TOKEN }}

      # - name: Coveralls
      #   uses: coverallsapp/github-action@v2

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.

# This workflow will install Python dependencies, run tests and lint with a single version of Python
# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
 
name: Tests
 
on:
  push:
    branches: ["master"]
  pull_request:
    branches: ["master"]
 
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
 
    strategy:
      fail-fast: false
      matrix:
        # Python 3.7  # EOL 2023-06-27
        # Python 3.8  # EOL 2024-10-14
        # Python 3.9  # EOL 2025-10-05
        # Python 3.10 # EOL 2026-10-04
        # Python 3.11 # EOL 2027-10-24
        # Python 3.12 # EOL 2028-10-31
        # Python 3.13 # EOL 2029-10-31
        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
    steps:
      - uses: actions/checkout@v4
 
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v3
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
 
      - name: Install dependencies
        run: |
          python -V
          python -m pip install --upgrade pip
          python -m pip install setuptools
          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
          python -m pip install pytest pytest-cov pytest-html ruff 
          # python -m pip install 
          pip list
 
      - name: Lint with ruff
        run: |
          ruff -V
          ruff check ftpsync tests setup.py
 
      - name: Test with pytest
        run: |
          pytest -V
          pytest -ra -v -x --durations=10 --cov=ftpsync
          # pytest -ra -v -x --durations=10 --cov=ftpsync --html=build/pytest/report-${{ matrix.python-version }}.html --self-contained-html
          # pytest -ra -v -x --durations=10 --cov=ftpsync --html=build/pytest/report-{envname}.html --self-contained-html {posargs}
 
      - name: Upload coverage reports to Codecov
        uses: codecov/codecov-action@v4.0.1
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
 
      # - name: Coveralls
      #   uses: coverallsapp/github-action@v2

What changed

2 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.

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:

This workflow runs 1 job (5 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 codecov/codecov-action