appraise "rails-32" do gem "rails", "~> 3.2.0" gem 'test-unit', '~> 3.0' end appraise "rails-40" do gem "rails", "~> 4.0.0" end appraise "rails-41" do gem "rails", "~> 4.1.0" end appraise "rails-42" do gem "rails", "~> 4.2.0" end appraise "rails-50" do gem "rails", "~> 5.0.0" end appraise "rails-51" do gem "rails", "~> 5.1.0" end