appraise "rails-4.0.0" do gem "rails", "4.0.0" end appraise "rails-4.1.1" do gem "rails", "4.0.2" end appraise "rails-4.2.0" do gem "rails", "4.2.0" end if RUBY_VERSION >= "2.2.0" appraise "rails-5.0.0" do gem "rails", "5.0.0" gem 'rails-controller-testing' end end