defaults: &defaults
  working_directory: ~/mutant
  steps:
    - checkout
    - run: bundle install
    - run: bundle exec rake ci

version: 2
jobs:
  ruby_2_3:
    <<: *defaults
    docker:
      - image: circleci/ruby:2.3.4
  ruby_2_4:
    <<: *defaults
    docker:
      - image: circleci/ruby:2.4.1
workflows:
  version: 2
  test:
    jobs:
      - ruby_2_3
      - ruby_2_4