test.yml

name: Unit Tests
on:
  pull_request:
    paths:
      - "src/**"

jobs:
  #
  # Run unit tests on PR branch
  #
  test:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Install dependencies
        run: yarn install

      - name: Run tests
        run: yarn test --coverage

      - name: Save coverage
        uses: actions/upload-artifact@v3
        with:
          name: pr-coverage
          path: coverage/
          retention-days: 1

  #
  # Get coverage on base branch by running tests.
  # This isn't very efficient for large test suites,
  # in that case consider using long-lived artifacts.
  #
  baseCoverage:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v3
        with:
          ref: main

      - name: Install dependencies
        run: yarn install

      - name: Run tests
        run: yarn test --coverage

      - name: Save coverage
        uses: actions/upload-artifact@v3
        with:
          name: base-coverage
          path: coverage/
          retention-days: 1

  #
  # Create coverage report
  #
  report:
    runs-on: ubuntu-latest
    needs: [test, baseCoverage]
    steps:
      - name: Checkout
        uses: actions/checkout@v3

      - name: Download PR coverage
        id: prCoverage
        uses: actions/download-artifact@v3
        with:
          name: pr-coverage
          path: pr-coverage

      - name: Download base coverage
        id: baseCoverage
        uses: actions/download-artifact@v3
        with:
          name: base-coverage
          path: base-coverage

      - name: Generate report
        uses: jgillick/test-coverage-reporter@main
        with:
          coverage-file: ${{steps.prCoverage.outputs.download-path}}/coverage-final.json
          base-coverage-file: ${{steps.baseCoverage.outputs.download-path}}/coverage-final.json
          access-token: ${{ secrets.GITHUB_TOKEN }}