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Matrix builds allow you to test your code across multiple environments, such as different versions of a language or operating system.

name: Node.js CI

on: [push, pull_request]

jobs:
  build:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        node-version: [12, 14, 16]

    steps:
    - uses: actions/checkout@v3
    - name: Set up Node.js
      uses: actions/setup-node@v3
      with:
        node-version: ${{ matrix.node-version }}
    - name: Install dependencies
      run: npm install
    - name: Run tests
      run: npm test