oppia/oppia

name: Lighthouse CI accessibility tests
on:
  merge_group:
    types: [checks_requested]
  push:
    branches:
      - develop
      - release-*
  pull_request:
    branches:
      - develop
      - release-*

jobs:
  lighthouse:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-22.04]
        shard: [1, 2]
    steps:
      - uses: actions/checkout@v3
      - uses: actions/setup-python@v4
        with:
          python-version: '3.8.15'
          architecture: 'x64'
      - uses: ./.github/actions/merge
      # Caching is disabled to avoid poisoning our cache with the
      # changed lighthouse file.
      #
      # - name: Cache node modules
      #   uses: actions/cache@v3
      #   env:
      #     cache-name: cache-node-modules
      #   with:
      #     path: /home/runner/work/oppia/yarn_cache
      #     key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('yarn.lock') }}
      #     restore-keys: |
      #       ${{ runner.os }}-build-${{ env.cache-name }}-
      #       ${{ runner.os }}-build-
      #       ${{ runner.os }}-
      - uses: ./.github/actions/install-oppia-dependencies
      - run: |
          # Replace the 1.5 second timeout in lighthouse for retrieving
          # sourcemaps with a 10 second timeout. This timeout is not
          # configurable through Lighthouse's exposed API, so we have
          # resorted to patching the code instead.
          set -e
          FILEPATH=$GITHUB_WORKSPACE/node_modules/lighthouse/lighthouse-core/gather/gatherers/source-maps.js
          SEARCH_TARGET="1500"
          REPLACEMENT="10000"
          occurrences=$(grep -c $SEARCH_TARGET $FILEPATH)
          echo "Found $occurrences occurrences of '$SEARCH_TARGET'"
          # Assert that there is only one match for the target string.
          # If there are ever zero or multiple matches, the lighthouse
          # code has changed and this logic needs to be reviewed.
          [[ $occurrences == "1" ]]
          # Replace the target string with the replacement string.
          sed -i 's/$SEARCH_TARGET/$REPLACEMENT/' $FILEPATH
          echo "Replaced '$SEARCH_TARGET' with '$REPLACEMENT' in $FILEPATH"
        shell: bash
      - name: Install chrome
        if: startsWith(github.head_ref, 'update-changelog-for-release') == false
        run: python -m scripts.install_chrome_for_ci
      - name: Run Lighthouse accessibility checks shard
        if: startsWith(github.head_ref, 'update-changelog-for-release') == false
        run: python -m scripts.run_lighthouse_tests --mode accessibility --shard ${{ matrix.shard }}
      - name: Report failure if failed on oppia/oppia develop branch
        if: ${{ failure() && github.event_name == 'push' && github.repository == 'oppia/oppia' && github.ref == 'refs/heads/develop'}}
        uses: ./.github/actions/send-webhook-notification
        with:
          message: "A Lighthouse test failed on the upstream develop branch."
          webhook-url: ${{ secrets.BUILD_FAILURE_ROOM_WEBHOOK_URL }}