Tests workflow (dask/dask-ml)

The Tests workflow from dask/dask-ml, explained and optimized by Latchkey.

CI health: C - fair

Run this on Latchkey for self-healing, caching, and up to 58% lower cost.

Grade your own workflow free or run it on Latchkey →

Source: dask/dask-ml.github/workflows/tests.yamlLicense BSD-3-ClauseView source

What it does

This is the Tests workflow from the dask/dask-ml repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-3-Clause license.

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

The workflow

workflow (.yml)

name: Tests

on: [push, pull_request]

jobs:
  test:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        # os: ["windows-latest", "ubuntu-latest", "macos-latest"]
        os: ["ubuntu-latest"]
        python-version: ["3.10", "3.11", "3.12", "3.13"]

    env:
      PYTHON_VERSION: ${{ matrix.python-version }}
      PARALLEL: "true"
      COVERAGE: "true"

    steps:
      - name: Checkout source
        uses: actions/checkout@v2
        with:
          fetch-depth: 0  # Needed by codecov.io

      - name: Setup Conda Environment
        uses: conda-incubator/setup-miniconda@v3
        with:
          miniforge-version: latest
          use-mamba: true
          channel-priority: strict
          python-version: ${{ matrix.python-version }}
          environment-file: ci/environment-${{ matrix.python-version }}.yaml
          activate-environment: test-environment
          auto-activate-base: false

      - name: Install
        shell: bash -l {0}
        run: source ci/install.sh

      - name: Run tests
        shell: bash -l {0}
        run: pytest -v

The same workflow, on Latchkey

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

name: Tests
 
on: [push, pull_request]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  test:
    timeout-minutes: 30
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        # os: ["windows-latest", "ubuntu-latest", "macos-latest"]
        os: ["ubuntu-latest"]
        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
    env:
      PYTHON_VERSION: ${{ matrix.python-version }}
      PARALLEL: "true"
      COVERAGE: "true"
 
    steps:
      - name: Checkout source
        uses: actions/checkout@v2
        with:
          fetch-depth: 0  # Needed by codecov.io
 
      - name: Setup Conda Environment
        uses: conda-incubator/setup-miniconda@v3
        with:
          miniforge-version: latest
          use-mamba: true
          channel-priority: strict
          python-version: ${{ matrix.python-version }}
          environment-file: ci/environment-${{ matrix.python-version }}.yaml
          activate-environment: test-environment
          auto-activate-base: false
 
      - name: Install
        shell: bash -l {0}
        run: source ci/install.sh
 
      - name: Run tests
        shell: bash -l {0}
        run: pytest -v

What changed

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.

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.

This workflow runs 1 job (4 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