language: ruby
script: 'bundle exec rake test:unit'
sudo: false
matrix:
  include:
    - rvm: 2.3.8
      gemfile: gemfiles/HEAD.gemfile
    - rvm: 2.4.5
      gemfile: gemfiles/HEAD.gemfile
    - rvm: 2.5.3
      gemfile: gemfiles/HEAD.gemfile
    - rvm: 2.6.0
      gemfile: gemfiles/HEAD.gemfile