Run Unit Tests workflow (cisco-ai-defense/mcp-scanner)

The Run Unit Tests workflow from cisco-ai-defense/mcp-scanner, explained and optimized by Latchkey.

What it does

This is the Run Unit Tests workflow from the cisco-ai-defense/mcp-scanner repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

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

The workflow

name: Run Unit Tests

on:
  push:
    branches:
      - main
  pull_request:

permissions:
  contents: read

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: ["3.11", "3.12", "3.13"]

    steps:
      - name: Checkout code
        uses: actions/checkout@v6

      - name: Install the latest version of uv and set the Python ${{ matrix.python-version }}
        uses: astral-sh/setup-uv@v7
        with:
          python-version: ${{ matrix.python-version }}

      - name: Install dependencies
        run: uv sync --group dev

      - name: Run tests
        run: uv run pytest

The same workflow, on Latchkey

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

name: Run Unit Tests
 
on:
  push:
    branches:
      - main
  pull_request:
 
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  test:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      matrix:
        python-version: ["3.11", "3.12", "3.13"]
 
    steps:
      - name: Checkout code
        uses: actions/checkout@v6
 
      - name: Install the latest version of uv and set the Python ${{ matrix.python-version }}
        uses: astral-sh/setup-uv@v7
        with:
          python-version: ${{ matrix.python-version }}
 
      - name: Install dependencies
        run: uv sync --group dev
 
      - name: Run tests
        run: uv run pytest
 

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• Cancel superseded runs when a branch or PR gets a newer push.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 (3 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