element-web/.github/workflows/cypress.yaml

# Triggers after the layered build has finished, taking the artifact and running cypress on it
name: Cypress End to End Tests
on:
  workflow_run:
    workflows: [ "Element Web - Build" ]
    types:
      - completed
jobs:
  prepare:
    name: Prepare
    if: github.event.workflow_run.conclusion == 'success'
    runs-on: ubuntu-latest
    permissions:
      actions: read
      issues: read
      statuses: write
      pull-requests: read
    outputs:
      uuid: ${{ steps.uuid.outputs.value }}
      pr_id: ${{ steps.prdetails.outputs.pr_id }}
      commit_message: ${{ steps.commit.outputs.message }}
      commit_author: ${{ steps.commit.outputs.author }}
      commit_email: ${{ steps.commit.outputs.email }}
      percy_enable: ${{ steps.percy.outputs.value || '1' }}
    steps:
      # We create the status here and then update it to success/failure in the `report` stage
      # This provides an easy link to this workflow_run from the PR before Cypress is done.
      - uses: Sibz/github-status-action@v1
        with:
          authToken: ${{ secrets.GITHUB_TOKEN }}
          state: pending
          context: ${{ github.workflow }} / cypress (${{ github.event.workflow_run.event }} => ${{ github.event_name }})
          sha: ${{ github.event.workflow_run.head_sha }}
          target_url: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}

      - id: prdetails
        if: github.event.workflow_run.event == 'pull_request'
        uses: matrix-org/pr-details-action@v1.2
        with:
          owner: ${{ github.event.workflow_run.head_repository.owner.login }}
          branch: ${{ github.event.workflow_run.head_branch }}

      - name: Get commit details
        id: commit
        if: github.event.workflow_run.event == 'pull_request'
        uses: actions/github-script@v5
        with:
          script: |
            const response = await github.rest.git.getCommit({
              owner: context.repo.owner,
              repo: context.repo.repo,
              commit_sha: "${{ github.event.workflow_run.head_sha }}",
            });
            core.setOutput("message", response.data.message);
            core.setOutput("author", response.data.author.name);
            core.setOutput("email", response.data.author.email);            

      # Only run Percy when it is demanded or on develop
      - name: Disable Percy if not needed
        id: percy
        if: |
          github.event.workflow_run.event == 'pull_request' &&
          !contains(fromJSON(steps.prdetails.outputs.data).labels.*.name, 'X-Needs-Percy')          
        run: echo "::set-output name=value::0"

      - name: Generate unique ID 💎
        id: uuid
        run: echo "::set-output name=value::sha-$GITHUB_SHA-time-$(date +"%s")"

  tests:
    name: "Run Tests"
    needs: prepare
    runs-on: ubuntu-latest
    permissions:
      actions: read
      issues: read
      pull-requests: read
    environment: Cypress
    strategy:
      fail-fast: false
      matrix:
        # Run 4 instances in Parallel
        runner: [1, 2, 3, 4]
    steps:
      - uses: actions/checkout@v3
        with:
          # XXX: We're checking out untrusted code in a secure context
          # We need to be careful to not trust anything this code outputs/may do
          # We need to check this out to access the cypress tests which are on the head branch
          repository: ${{ github.event.workflow_run.head_repository.full_name }}
          ref: ${{ github.event.workflow_run.head_sha }}
          persist-credentials: false

      # There's a 'download artifact' action, but it hasn't been updated for the workflow_run action
      # (https://github.com/actions/download-artifact/issues/60) so instead we get this mess:
      - name: 📥 Download artifact
        uses: dawidd6/action-download-artifact@v2
        with:
          workflow: element-build-and-test.yaml
          run_id: ${{ github.event.workflow_run.id }}
          name: previewbuild
          path: webapp

      - name: Run Cypress tests
        uses: cypress-io/github-action@v4.1.1
        with:
          # The built-in Electron runner seems to grind to a halt trying
          # to run the tests, so use chrome.
          browser: chrome
          start: npx serve -p 8080 webapp
          wait-on: 'http://localhost:8080'
          record: true
          parallel: true
          command-prefix: 'yarn percy exec --parallel --'
          ci-build-id: ${{ needs.prepare.outputs.uuid }}
        env:
          # pass the Dashboard record key as an environment variable
          CYPRESS_RECORD_KEY: ${{ secrets.CYPRESS_RECORD_KEY }}

          # Use existing chromium rather than downloading another
          PUPPETEER_SKIP_CHROMIUM_DOWNLOAD: true

          # pass GitHub token to allow accurately detecting a build vs a re-run build
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

          # make Node's os.tmpdir() return something where we actually have permissions
          TMPDIR: ${{ runner.temp }}

          # tell Cypress more details about the context of this run
          COMMIT_INFO_BRANCH: ${{ github.event.workflow_run.head_branch }}
          COMMIT_INFO_SHA: ${{ github.event.workflow_run.head_sha }}
          COMMIT_INFO_REMOTE: ${{ github.repositoryUrl }}
          COMMIT_INFO_MESSAGE: ${{ needs.prepare.outputs.commit_message }}
          COMMIT_INFO_AUTHOR: ${{ needs.prepare.outputs.commit_author }}
          COMMIT_INFO_EMAIL: ${{ needs.prepare.outputs.commit_email }}

          # pass the Percy token as an environment variable
          PERCY_TOKEN: ${{ secrets.PERCY_TOKEN }}
          PERCY_ENABLE: ${{ needs.prepare.outputs.percy_enable }}
          PERCY_BROWSER_EXECUTABLE: /usr/bin/chromium-browser
          # tell Percy more details about the context of this run
          PERCY_BRANCH: ${{ github.event.workflow_run.head_branch }}
          PERCY_COMMIT: ${{ github.event.workflow_run.head_sha }}
          PERCY_PULL_REQUEST: ${{ needs.prepare.outputs.pr_id }}
          PERCY_PARALLEL_TOTAL: ${{ strategy.job-total }}
          PERCY_PARALLEL_NONCE: ${{ needs.prepare.outputs.uuid }}

      - name: Upload Artifact
        if: failure()
        uses: actions/upload-artifact@v2
        with:
          name: cypress-results
          path: |
            cypress/screenshots
            cypress/videos
            cypress/synapselogs            

  report:
    name: Report results
    needs: tests
    runs-on: ubuntu-latest
    if: always()
    permissions:
      statuses: write
    steps:
      - uses: Sibz/github-status-action@v1
        with:
          authToken: ${{ secrets.GITHUB_TOKEN }}
          state: ${{ needs.tests.result == 'success' && 'success' || 'failure' }}
          context: ${{ github.workflow }} / cypress (${{ github.event.workflow_run.event }} => ${{ github.event_name }})
          sha: ${{ github.event.workflow_run.head_sha }}
          target_url: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}