added frozen literals

Guardfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 guard :rspec,
       cmd:         'bundle exec rspec --format documentation',
       failed_mode: :keep do

Rakefile

@@ -1,4 +1,6 @@
 #!/usr/bin/env rake
+# frozen_string_literal: true
+
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 

config.ru

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file is used by Rack-based servers to start the application.
 
 require ::File.expand_path('../config/environment', __FILE__)

spec/rails_helper.rb

@@ -59,8 +59,8 @@ include Warden::Test::Helpers
 # directory. Alternatively, in the individual `*_spec.rb` files, manually
 # require only the support files necessary.
 #
-Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }
-Dir[Rails.root.join("spec/features/shared_examples/**/*.rb")].each { |f| require f }
+Dir[Rails.root.join("spec/support/**/*.rb")].sort.each { |f| require f }
+Dir[Rails.root.join("spec/features/shared_examples/**/*.rb")].sort.each { |f| require f }
 
 # Checks for pending migrations before tests are run.
 # If you are not using ActiveRecord, you can remove this line.