Rails x CircleCI

config.yml

version: 2.1

executors:
  default:
    working_directory: ~/repo
    docker:
      - image: circleci/ruby:2.5.1-node-browsers
    environment:
      RACK_ENV: test
      RAILS_ENV: test

commands:
  setup_packages:
    steps:
      - restore_cache:
          keys:
          - v1-dependencies-{{ checksum "Gemfile.lock" }}
          # fallback to using the latest cache if no exact match is found
          - v1-dependencies-

      - run:
          name: install dependencies
          command: |
            bundle install --jobs=4 --retry=3 --path vendor/bundle

      - save_cache:
          paths:
            - ./vendor/bundle
          key: v1-dependencies-{{ checksum "Gemfile.lock" }}

jobs:
  rspec:
    executor:
      name: default

    environment:
      PARALLEL_TESTS_CONCURRENCY: 4

    parallelism: 2

    steps:
      - checkout
      - setup_packages

      # Database setup
      - run: bundle exec rails parallel:setup[${PARALLEL_TESTS_CONCURRENCY}]

      # run tests!
      - run:
          name: run tests
          command: |
            mkdir /tmp/test-results
            TEST_FILES="$(circleci tests glob "spec/**/*_spec.rb" | circleci tests split --split-by=timings)"
            bundle exec parallel_rspec -n ${PARALLEL_TESTS_CONCURRENCY} $TEST_FILES

      - run:
          name: Stash coverage results
          command: |
            mkdir coverage_results
            cp -R coverage/.resultset.json coverage_results/.resultset-${CIRCLE_NODE_INDEX}.json

      - persist_to_workspace:
          root: .
          paths:
            - coverage_results

      # collect reports
      - store_test_results:
          path: /tmp/test-results

      - store_artifacts:
          path: /tmp/test-results
          destination: test-results

  coverage:
    executor:
      name: default

    steps:
      - checkout
      - setup_packages

      - attach_workspace:
          at: .

      - run: bundle exec rails simplecov:report_coverage

      - store_artifacts:
          path: ~/repo/coverage
          destination: coverage

workflows:
  build:
    jobs:
      - rspec
      - coverage:
          requires:
            - rspec