The corrected workflow file for step.12 of the Github learning lab

node.js.yml

# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions

name: Node CI

on: [push]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: npm install and build webpack
        run: |
          npm install
          npm run build
      - uses: actions/upload-artifact@master
        with:
          name: webpack artifacts
          path: public/

  test:
    needs: build
    runs-on: ubuntu-latest
    strategy:
      matrix:
        on: [ubuntu-latest, windows-2016]
        node-version: [12.x, 14.x]
    steps:
    - uses: actions/checkout@v2
    - uses: actions/download-artifact@master
      with:
        name: webpack artifacts
        path: public 
    - name: Use Node.js ${{ matrix.node-version }}
      uses: actions/setup-node@v1
      with:
        node-version: ${{ matrix.node-version }}
    - name: npm install, and test
      run: |
        npm install
        npm test
      env:
        CI: true