Tests workflow (samber/mo)

The Tests workflow from samber/mo, explained and optimized by Latchkey.

What it does

This is the Tests workflow from the samber/mo 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

name: Tests

on:
  push:
    branches:
      - master
  pull_request:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        go:
          - "1.18"
          - "1.19"
          - "1.20"
          - "1.21"
          - "1.22"
          - "1.23"
          - "1.24"
          - "1.25"
          - "1.26"
          - "stable"
    steps:
      - uses: actions/checkout@v7

      - name: Set up Go
        uses: actions/setup-go@v6
        with:
          go-version: ${{ matrix.go }}
          stable: false

      - name: Build
        run: make build

      - name: Test
        run: make test

      - name: Test coverage
        run: make coverage
        if: matrix.go == 'stable'

      - name: Codecov
        uses: codecov/codecov-action@v7
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          file: ./cover.out
          flags: unittests
          verbose: true
        if: matrix.go == 'stable'

The same workflow, on Latchkey

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

name: Tests
 
on:
  push:
    branches:
      - master
  pull_request:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      matrix:
        go:
          - "1.18"
          - "1.19"
          - "1.20"
          - "1.21"
          - "1.22"
          - "1.23"
          - "1.24"
          - "1.25"
          - "1.26"
          - "stable"
    steps:
      - uses: actions/checkout@v7
 
      - name: Set up Go
        uses: actions/setup-go@v6
        with:
          go-version: ${{ matrix.go }}
          stable: false
 
      - name: Build
        run: make build
 
      - name: Test
        run: make test
 
      - name: Test coverage
        run: make coverage
        if: matrix.go == 'stable'
 
      - name: Codecov
        uses: codecov/codecov-action@v7
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          file: ./cover.out
          flags: unittests
          verbose: true
        if: matrix.go == 'stable'
 

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.

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 (10 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