Run Rspec tests in parallel

action.yaml

name: app
on:
  pull_request:
    branches:
      - master

jobs:
  build:
    runs-on: ubuntu-18.04
    services:
      database:
        image: postgres:12.1-alpine
        env:
          POSTGRES_USER: app
          POSTGRES_PASSWORD: pass
        ports:
          - '5432:5432'
      redis:
        image: redis
        ports:
        - 6379:6379
        options: --entrypoint redis-server
      search:
        image: elasticsearch:6.8.2
        ports:
          - 9200:9200
        env:
          discovery.type: single-node

    strategy:
      fail-fast: false
      matrix:
        # Set N number of parallel jobs you want to run tests on.
        # Use higher number if you have slow tests to split them on more parallel jobs.
        # Remember to update ci_node_index below to 0..N-1
        ci_node_total: [8]
        #ci_node_total: [2]
        # set N-1 indexes for parallel jobs
        # When you run 2 parallel jobs then first job will have index 0, the second job will have index 1 etc
        ci_node_index: [0,1,2,3,4,5,6,7]
        #ci_node_index: [0,1]

    steps:
      - name: Checkout
        uses: actions/checkout@v2

      - name: Set up Ruby
        uses: ruby/setup-ruby@v1
        with:
          ruby-version: 2.6.6
          bundler: Gemfile.lock

      - name: Cache dependencies
        uses: actions/cache@v1
        with:
          path: ~/.bundle
          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
          restore-keys: |
            ${{ runner.os }}-gems-

      - name: Install dependencies
        run: |
          bundle config path ~/.bundle
          bundle install --jobs 4 --retry 3

      - name: Set up Database
        env:
          DATABASE_URL: postgresql://app:pass@localhost:5432/app_test
          RACK_ENV: test
        run: |
          bundle exec rake db:create
          bundle exec rake db:migrate

      - name: Run Unit Tests
        env:
          DATABASE_URL: postgresql://app:pass@localhost:5432/app_test
          REDIS_HOST: redis://localhost:6379/0
          ELASTICSEARCH_URL: http://localhost:9200
          RACK_ENV: test
          CI_NODE_TOTAL: ${{ matrix.ci_node_total }}
          CI_NODE_INDEX: ${{ matrix.ci_node_index }}
          CI_PARALLEL_TESTS: true
        run: bundle exec rake "knapsack:rspec[-f RspecJunitFormatter -o reports/rspec/report.xml -f documentation]"