before_install: gem update bundler
language: ruby
matrix:
  include:
  # test lastest config
  - rvm: 2.3

  # test versions of ActiveRecord
  - gemfile: gemfiles/activerecord4.rb
    rvm: 2.3
  - gemfile: gemfiles/activerecord3.rb
    rvm: 2.3

  # test versions of MRI
  - gemfile: gemfiles/activerecord4.rb
    rvm: 2.2
  - gemfile: gemfiles/activerecord4.rb
    rvm: 2.1
  - gemfile: gemfiles/activerecord4.rb
    rvm: 2.0
  - gemfile: gemfiles/activerecord4.rb
    rvm: 1.9
script: bundle exec rake spec