version: 2.1

jobs:
  rake_default:
    parameters:
      image:
        description: "Name of the Docker image."
        type: string
        default: "circleci/ruby"
    docker:
      - image: << parameters.image >>
    environment:
      # CircleCI container has two cores, but Ruby can see 32 cores. So we
      # configure test-queue.
      # See https://github.com/tmm1/test-queue#environment-variables
      TEST_QUEUE_WORKERS: 2
      JRUBY_OPTS: "--dev -J-Xmx1000M"
    steps:
      - checkout
      - run: bundle install
      - run: bundle exec rake

workflows:
  build:
    jobs:
      - rake_default:
          name: Ruby 2.3
          image: circleci/ruby:2.3
      - rake_default:
          name: Ruby 2.4
          image: circleci/ruby:2.4
      - rake_default:
          name: Ruby 2.5
          image: circleci/ruby:2.5
      - rake_default:
          name: Ruby 2.6
          image: circleci/ruby:2.6
      - rake_default:
          name: Ruby 2.7
          image: circleci/ruby:2.7
      - rake_default:
          name: Ruby HEAD
          image: rubocophq/circleci-ruby-snapshot:latest # Nightly snapshot build
      - rake_default:
          name: JRuby 9.2
          image: circleci/jruby:9.2