diff --git a/Rakefile b/Rakefile
index 1ece77e55..e96e6932b 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 begin
   require 'bundler/setup'
 rescue LoadError
diff --git a/app/controllers/devise_token_auth/application_controller.rb b/app/controllers/devise_token_auth/application_controller.rb
index 510ff2ec0..99efaa169 100644
--- a/app/controllers/devise_token_auth/application_controller.rb
+++ b/app/controllers/devise_token_auth/application_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class ApplicationController < DeviseController
     include DeviseTokenAuth::Concerns::SetUserByToken
diff --git a/app/controllers/devise_token_auth/concerns/resource_finder.rb b/app/controllers/devise_token_auth/concerns/resource_finder.rb
index 4a18a51dc..9ee1a4386 100644
--- a/app/controllers/devise_token_auth/concerns/resource_finder.rb
+++ b/app/controllers/devise_token_auth/concerns/resource_finder.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth::Concerns::ResourceFinder
   extend ActiveSupport::Concern
   include DeviseTokenAuth::Controllers::Helpers
diff --git a/app/controllers/devise_token_auth/concerns/set_user_by_token.rb b/app/controllers/devise_token_auth/concerns/set_user_by_token.rb
index 3eefae950..1715461c4 100644
--- a/app/controllers/devise_token_auth/concerns/set_user_by_token.rb
+++ b/app/controllers/devise_token_auth/concerns/set_user_by_token.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth::Concerns::SetUserByToken
   extend ActiveSupport::Concern
   include DeviseTokenAuth::Concerns::ResourceFinder
diff --git a/app/controllers/devise_token_auth/confirmations_controller.rb b/app/controllers/devise_token_auth/confirmations_controller.rb
index 441cc3448..ed14894a0 100644
--- a/app/controllers/devise_token_auth/confirmations_controller.rb
+++ b/app/controllers/devise_token_auth/confirmations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class ConfirmationsController < DeviseTokenAuth::ApplicationController
     def show
diff --git a/app/controllers/devise_token_auth/omniauth_callbacks_controller.rb b/app/controllers/devise_token_auth/omniauth_callbacks_controller.rb
index 52a140d10..c0917716b 100644
--- a/app/controllers/devise_token_auth/omniauth_callbacks_controller.rb
+++ b/app/controllers/devise_token_auth/omniauth_callbacks_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class OmniauthCallbacksController < DeviseTokenAuth::ApplicationController
 
diff --git a/app/controllers/devise_token_auth/passwords_controller.rb b/app/controllers/devise_token_auth/passwords_controller.rb
index 8de8b2759..92fdd0230 100644
--- a/app/controllers/devise_token_auth/passwords_controller.rb
+++ b/app/controllers/devise_token_auth/passwords_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class PasswordsController < DeviseTokenAuth::ApplicationController
     before_action :set_user_by_token, :only => [:update]
diff --git a/app/controllers/devise_token_auth/registrations_controller.rb b/app/controllers/devise_token_auth/registrations_controller.rb
index 7b6ea0996..2dc38066e 100644
--- a/app/controllers/devise_token_auth/registrations_controller.rb
+++ b/app/controllers/devise_token_auth/registrations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class RegistrationsController < DeviseTokenAuth::ApplicationController
     before_action :set_user_by_token, only: [:destroy, :update]
diff --git a/app/controllers/devise_token_auth/sessions_controller.rb b/app/controllers/devise_token_auth/sessions_controller.rb
index 559d456c5..7ffa97aa8 100644
--- a/app/controllers/devise_token_auth/sessions_controller.rb
+++ b/app/controllers/devise_token_auth/sessions_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # see http://www.emilsoman.com/blog/2013/05/18/building-a-tested/
 module DeviseTokenAuth
   class SessionsController < DeviseTokenAuth::ApplicationController
diff --git a/app/controllers/devise_token_auth/token_validations_controller.rb b/app/controllers/devise_token_auth/token_validations_controller.rb
index fccc8cafc..4d82fdec4 100644
--- a/app/controllers/devise_token_auth/token_validations_controller.rb
+++ b/app/controllers/devise_token_auth/token_validations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class TokenValidationsController < DeviseTokenAuth::ApplicationController
     skip_before_action :assert_is_devise_resource!, :only => [:validate_token]
diff --git a/app/controllers/devise_token_auth/unlocks_controller.rb b/app/controllers/devise_token_auth/unlocks_controller.rb
index de1cf9017..13faa023d 100644
--- a/app/controllers/devise_token_auth/unlocks_controller.rb
+++ b/app/controllers/devise_token_auth/unlocks_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class UnlocksController < DeviseTokenAuth::ApplicationController
     skip_after_action :update_auth_header, :only => [:create, :show]
diff --git a/app/models/devise_token_auth/concerns/user.rb b/app/models/devise_token_auth/concerns/user.rb
index bb009ea81..32ccdcbf6 100644
--- a/app/models/devise_token_auth/concerns/user.rb
+++ b/app/models/devise_token_auth/concerns/user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bcrypt'
 
 module DeviseTokenAuth::Concerns::User
diff --git a/app/models/devise_token_auth/concerns/user_omniauth_callbacks.rb b/app/models/devise_token_auth/concerns/user_omniauth_callbacks.rb
index f47053f3a..7d3b5536e 100644
--- a/app/models/devise_token_auth/concerns/user_omniauth_callbacks.rb
+++ b/app/models/devise_token_auth/concerns/user_omniauth_callbacks.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth::Concerns::UserOmniauthCallbacks
   extend ActiveSupport::Concern
 
diff --git a/app/validators/email_validator.rb b/app/validators/email_validator.rb
index de50350b3..441cc598b 100644
--- a/app/validators/email_validator.rb
+++ b/app/validators/email_validator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class EmailValidator < ActiveModel::EachValidator
   def validate_each(record, attribute, value)
     unless value =~ /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
@@ -18,4 +20,4 @@ def email_invalid_message
 
     message
   end
-end
\ No newline at end of file
+end
diff --git a/config/initializers/devise.rb b/config/initializers/devise.rb
index e2c9d047b..d6f92d0f1 100644
--- a/config/initializers/devise.rb
+++ b/config/initializers/devise.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Use this hook to configure devise mailer, warden hooks and so forth.
 # Many of these configuration options can be set straight in your model.
 Devise.setup do |config|
diff --git a/lib/devise_token_auth.rb b/lib/devise_token_auth.rb
index e80ecf04e..28af93b3a 100644
--- a/lib/devise_token_auth.rb
+++ b/lib/devise_token_auth.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "devise"
 require "devise_token_auth/engine"
 require "devise_token_auth/controllers/helpers"
diff --git a/lib/devise_token_auth/controllers/helpers.rb b/lib/devise_token_auth/controllers/helpers.rb
index 89b8babae..fb070cf52 100644
--- a/lib/devise_token_auth/controllers/helpers.rb
+++ b/lib/devise_token_auth/controllers/helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   module Controllers
     module Helpers
diff --git a/lib/devise_token_auth/controllers/url_helpers.rb b/lib/devise_token_auth/controllers/url_helpers.rb
index 0aad7c36f..b54c15424 100644
--- a/lib/devise_token_auth/controllers/url_helpers.rb
+++ b/lib/devise_token_auth/controllers/url_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   module Controllers
     module UrlHelpers
diff --git a/lib/devise_token_auth/engine.rb b/lib/devise_token_auth/engine.rb
index a47ef307a..d2d44fd79 100644
--- a/lib/devise_token_auth/engine.rb
+++ b/lib/devise_token_auth/engine.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'devise_token_auth/rails/routes'
 
 module DeviseTokenAuth
diff --git a/lib/devise_token_auth/errors.rb b/lib/devise_token_auth/errors.rb
index 33762593b..ca9fd5a0c 100644
--- a/lib/devise_token_auth/errors.rb
+++ b/lib/devise_token_auth/errors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   module Errors
     class NoResourceDefinedError < StandardError ; end
diff --git a/lib/devise_token_auth/rails/routes.rb b/lib/devise_token_auth/rails/routes.rb
index e3e248a2a..4167d7e7c 100644
--- a/lib/devise_token_auth/rails/routes.rb
+++ b/lib/devise_token_auth/rails/routes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ActionDispatch::Routing
   class Mapper
     def mount_devise_token_auth_for(resource, opts)
diff --git a/lib/devise_token_auth/url.rb b/lib/devise_token_auth/url.rb
index 999e6c7ba..a0532eba3 100644
--- a/lib/devise_token_auth/url.rb
+++ b/lib/devise_token_auth/url.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth::Url
 
   def self.generate(url, params = {})
diff --git a/lib/devise_token_auth/version.rb b/lib/devise_token_auth/version.rb
index 03f22c59d..d769b2e1b 100644
--- a/lib/devise_token_auth/version.rb
+++ b/lib/devise_token_auth/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   VERSION = '0.1.43'
 end
diff --git a/lib/generators/devise_token_auth/install_generator.rb b/lib/generators/devise_token_auth/install_generator.rb
index 17b592593..f7785f651 100644
--- a/lib/generators/devise_token_auth/install_generator.rb
+++ b/lib/generators/devise_token_auth/install_generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class InstallGenerator < Rails::Generators::Base
     include Rails::Generators::Migration
diff --git a/lib/generators/devise_token_auth/install_views_generator.rb b/lib/generators/devise_token_auth/install_views_generator.rb
index 4ba5d97d1..38b7a7580 100644
--- a/lib/generators/devise_token_auth/install_views_generator.rb
+++ b/lib/generators/devise_token_auth/install_views_generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DeviseTokenAuth
   class InstallViewsGenerator < Rails::Generators::Base
     source_root File.expand_path('../../../../app/views/devise/mailer', __FILE__)
diff --git a/lib/generators/devise_token_auth/templates/devise_token_auth.rb b/lib/generators/devise_token_auth/templates/devise_token_auth.rb
index af7acd737..dec712ecb 100644
--- a/lib/generators/devise_token_auth/templates/devise_token_auth.rb
+++ b/lib/generators/devise_token_auth/templates/devise_token_auth.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 DeviseTokenAuth.setup do |config|
   # By default the authorization headers will change after each request. The
   # client is responsible for keeping track of the changing tokens. Change
diff --git a/lib/generators/devise_token_auth/templates/user.rb b/lib/generators/devise_token_auth/templates/user.rb
index 3567ec5dc..a6cb47a23 100644
--- a/lib/generators/devise_token_auth/templates/user.rb
+++ b/lib/generators/devise_token_auth/templates/user.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 
 class <%= user_class %> < ActiveRecord::Base
   # Include default devise modules. Others available are:
diff --git a/lib/tasks/devise_token_auth_tasks.rake b/lib/tasks/devise_token_auth_tasks.rake
index af47beff8..0e8215572 100644
--- a/lib/tasks/devise_token_auth_tasks.rake
+++ b/lib/tasks/devise_token_auth_tasks.rake
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # desc "Explaining what the task does"
 # task :devise_token_auth do
 #   # Task goes here
diff --git a/test/controllers/custom/custom_confirmations_controller_test.rb b/test/controllers/custom/custom_confirmations_controller_test.rb
index ffe076588..f680ba194 100644
--- a/test/controllers/custom/custom_confirmations_controller_test.rb
+++ b/test/controllers/custom/custom_confirmations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class Custom::ConfirmationsControllerTest < ActionController::TestCase
diff --git a/test/controllers/custom/custom_omniauth_callbacks_controller_test.rb b/test/controllers/custom/custom_omniauth_callbacks_controller_test.rb
index dcd4b0ad6..32077dfa6 100644
--- a/test/controllers/custom/custom_omniauth_callbacks_controller_test.rb
+++ b/test/controllers/custom/custom_omniauth_callbacks_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class Custom::OmniauthCallbacksControllerTest < ActionDispatch::IntegrationTest
diff --git a/test/controllers/custom/custom_passwords_controller_test.rb b/test/controllers/custom/custom_passwords_controller_test.rb
index 25755574a..d2f7ea0cd 100644
--- a/test/controllers/custom/custom_passwords_controller_test.rb
+++ b/test/controllers/custom/custom_passwords_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class Custom::PasswordsControllerTest < ActionController::TestCase
diff --git a/test/controllers/custom/custom_registrations_controller_test.rb b/test/controllers/custom/custom_registrations_controller_test.rb
index 16c68b989..d38b695a9 100644
--- a/test/controllers/custom/custom_registrations_controller_test.rb
+++ b/test/controllers/custom/custom_registrations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class Custom::RegistrationsControllerTest < ActionDispatch::IntegrationTest
diff --git a/test/controllers/custom/custom_sessions_controller_test.rb b/test/controllers/custom/custom_sessions_controller_test.rb
index 11187c8dc..7a313bcb9 100644
--- a/test/controllers/custom/custom_sessions_controller_test.rb
+++ b/test/controllers/custom/custom_sessions_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class Custom::SessionsControllerTest < ActionController::TestCase
diff --git a/test/controllers/custom/custom_token_validations_controller_test.rb b/test/controllers/custom/custom_token_validations_controller_test.rb
index 7d6321ce0..0f424ac6f 100644
--- a/test/controllers/custom/custom_token_validations_controller_test.rb
+++ b/test/controllers/custom/custom_token_validations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class Custom::TokenValidationsControllerTest < ActionDispatch::IntegrationTest
diff --git a/test/controllers/demo_group_controller_test.rb b/test/controllers/demo_group_controller_test.rb
index cf334f125..374c3bf60 100644
--- a/test/controllers/demo_group_controller_test.rb
+++ b/test/controllers/demo_group_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/demo_mang_controller_test.rb b/test/controllers/demo_mang_controller_test.rb
index 85b542fed..7d410196e 100644
--- a/test/controllers/demo_mang_controller_test.rb
+++ b/test/controllers/demo_mang_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/demo_user_controller_test.rb b/test/controllers/demo_user_controller_test.rb
index 793e7a038..676ca9dbf 100644
--- a/test/controllers/demo_user_controller_test.rb
+++ b/test/controllers/demo_user_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/devise_token_auth/confirmations_controller_test.rb b/test/controllers/devise_token_auth/confirmations_controller_test.rb
index 36f8841fa..dc719f86c 100644
--- a/test/controllers/devise_token_auth/confirmations_controller_test.rb
+++ b/test/controllers/devise_token_auth/confirmations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/devise_token_auth/omniauth_callbacks_controller_test.rb b/test/controllers/devise_token_auth/omniauth_callbacks_controller_test.rb
index 40ba9881c..f1c9f7a8d 100644
--- a/test/controllers/devise_token_auth/omniauth_callbacks_controller_test.rb
+++ b/test/controllers/devise_token_auth/omniauth_callbacks_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 #  was the web request successful?
 #  was the user redirected to the right page?
diff --git a/test/controllers/devise_token_auth/passwords_controller_test.rb b/test/controllers/devise_token_auth/passwords_controller_test.rb
index 490be7da7..ee9565a24 100644
--- a/test/controllers/devise_token_auth/passwords_controller_test.rb
+++ b/test/controllers/devise_token_auth/passwords_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/devise_token_auth/registrations_controller_test.rb b/test/controllers/devise_token_auth/registrations_controller_test.rb
index ee987ba10..d57a079a3 100644
--- a/test/controllers/devise_token_auth/registrations_controller_test.rb
+++ b/test/controllers/devise_token_auth/registrations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/devise_token_auth/sessions_controller_test.rb b/test/controllers/devise_token_auth/sessions_controller_test.rb
index 5de4da388..8fe6bfa20 100644
--- a/test/controllers/devise_token_auth/sessions_controller_test.rb
+++ b/test/controllers/devise_token_auth/sessions_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/devise_token_auth/token_validations_controller_test.rb b/test/controllers/devise_token_auth/token_validations_controller_test.rb
index 67dade450..dda39dc92 100644
--- a/test/controllers/devise_token_auth/token_validations_controller_test.rb
+++ b/test/controllers/devise_token_auth/token_validations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/devise_token_auth/unlocks_controller_test.rb b/test/controllers/devise_token_auth/unlocks_controller_test.rb
index 2333348cf..59969ee88 100644
--- a/test/controllers/devise_token_auth/unlocks_controller_test.rb
+++ b/test/controllers/devise_token_auth/unlocks_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/overrides/confirmations_controller_test.rb b/test/controllers/overrides/confirmations_controller_test.rb
index d22934f3d..78dd6a924 100644
--- a/test/controllers/overrides/confirmations_controller_test.rb
+++ b/test/controllers/overrides/confirmations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/overrides/omniauth_callbacks_controller_test.rb b/test/controllers/overrides/omniauth_callbacks_controller_test.rb
index 1144ea63b..1ee782559 100644
--- a/test/controllers/overrides/omniauth_callbacks_controller_test.rb
+++ b/test/controllers/overrides/omniauth_callbacks_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/overrides/passwords_controller_test.rb b/test/controllers/overrides/passwords_controller_test.rb
index b22def810..a373dddfd 100644
--- a/test/controllers/overrides/passwords_controller_test.rb
+++ b/test/controllers/overrides/passwords_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/overrides/registrations_controller_test.rb b/test/controllers/overrides/registrations_controller_test.rb
index d8e55a8c9..06c585fb3 100644
--- a/test/controllers/overrides/registrations_controller_test.rb
+++ b/test/controllers/overrides/registrations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/overrides/sessions_controller_test.rb b/test/controllers/overrides/sessions_controller_test.rb
index 5a89cae3f..2fdcfa74b 100644
--- a/test/controllers/overrides/sessions_controller_test.rb
+++ b/test/controllers/overrides/sessions_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/controllers/overrides/token_validations_controller_test.rb b/test/controllers/overrides/token_validations_controller_test.rb
index 4dd286778..880f868ff 100644
--- a/test/controllers/overrides/token_validations_controller_test.rb
+++ b/test/controllers/overrides/token_validations_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 #  was the web request successful?
diff --git a/test/dummy/Rakefile b/test/dummy/Rakefile
index ba6b733dd..da4efd575 100644
--- a/test/dummy/Rakefile
+++ b/test/dummy/Rakefile
@@ -1,3 +1,5 @@
+# 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.
 
diff --git a/test/dummy/app/controllers/application_controller.rb b/test/dummy/app/controllers/application_controller.rb
index bf0f6fb13..db3587745 100644
--- a/test/dummy/app/controllers/application_controller.rb
+++ b/test/dummy/app/controllers/application_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationController < ActionController::Base
   include DeviseTokenAuth::Concerns::SetUserByToken
 
diff --git a/test/dummy/app/controllers/auth_origin_controller.rb b/test/dummy/app/controllers/auth_origin_controller.rb
index be14dc00f..1a40401be 100644
--- a/test/dummy/app/controllers/auth_origin_controller.rb
+++ b/test/dummy/app/controllers/auth_origin_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AuthOriginController < ApplicationController
   def redirected
     head :ok
diff --git a/test/dummy/app/controllers/custom/confirmations_controller.rb b/test/dummy/app/controllers/custom/confirmations_controller.rb
index 8e29e8976..31ee06c2c 100644
--- a/test/dummy/app/controllers/custom/confirmations_controller.rb
+++ b/test/dummy/app/controllers/custom/confirmations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Custom::ConfirmationsController < DeviseTokenAuth::ConfirmationsController
 
   def show
diff --git a/test/dummy/app/controllers/custom/omniauth_callbacks_controller.rb b/test/dummy/app/controllers/custom/omniauth_callbacks_controller.rb
index 68d0fa748..a2b51e696 100644
--- a/test/dummy/app/controllers/custom/omniauth_callbacks_controller.rb
+++ b/test/dummy/app/controllers/custom/omniauth_callbacks_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Custom::OmniauthCallbacksController < DeviseTokenAuth::OmniauthCallbacksController
   def omniauth_success
     super do |resource|
diff --git a/test/dummy/app/controllers/custom/passwords_controller.rb b/test/dummy/app/controllers/custom/passwords_controller.rb
index 3f7b6a828..d3a6b03d3 100644
--- a/test/dummy/app/controllers/custom/passwords_controller.rb
+++ b/test/dummy/app/controllers/custom/passwords_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Custom::PasswordsController < DeviseTokenAuth::PasswordsController
 
   def create
diff --git a/test/dummy/app/controllers/custom/registrations_controller.rb b/test/dummy/app/controllers/custom/registrations_controller.rb
index 36d90a29e..9994c0f85 100644
--- a/test/dummy/app/controllers/custom/registrations_controller.rb
+++ b/test/dummy/app/controllers/custom/registrations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Custom::RegistrationsController < DeviseTokenAuth::RegistrationsController
 
   def create
diff --git a/test/dummy/app/controllers/custom/sessions_controller.rb b/test/dummy/app/controllers/custom/sessions_controller.rb
index 57809020e..91fb0e195 100644
--- a/test/dummy/app/controllers/custom/sessions_controller.rb
+++ b/test/dummy/app/controllers/custom/sessions_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Custom::SessionsController < DeviseTokenAuth::SessionsController
 
   def create
diff --git a/test/dummy/app/controllers/custom/token_validations_controller.rb b/test/dummy/app/controllers/custom/token_validations_controller.rb
index 4bfca82bb..d4ee4fda8 100644
--- a/test/dummy/app/controllers/custom/token_validations_controller.rb
+++ b/test/dummy/app/controllers/custom/token_validations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Custom::TokenValidationsController < DeviseTokenAuth::TokenValidationsController
 
   def validate_token
diff --git a/test/dummy/app/controllers/demo_group_controller.rb b/test/dummy/app/controllers/demo_group_controller.rb
index e31a54c87..169fedfd2 100644
--- a/test/dummy/app/controllers/demo_group_controller.rb
+++ b/test/dummy/app/controllers/demo_group_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DemoGroupController < ApplicationController
   devise_token_auth_group :member, contains: [:user, :mang]
   before_action :authenticate_member!
diff --git a/test/dummy/app/controllers/demo_mang_controller.rb b/test/dummy/app/controllers/demo_mang_controller.rb
index 7d052867a..c7388115c 100644
--- a/test/dummy/app/controllers/demo_mang_controller.rb
+++ b/test/dummy/app/controllers/demo_mang_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DemoMangController < ApplicationController
   before_action :authenticate_mang!
 
diff --git a/test/dummy/app/controllers/demo_user_controller.rb b/test/dummy/app/controllers/demo_user_controller.rb
index a17789fbd..6a9488b3c 100644
--- a/test/dummy/app/controllers/demo_user_controller.rb
+++ b/test/dummy/app/controllers/demo_user_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DemoUserController < ApplicationController
   before_action :authenticate_user!
 
diff --git a/test/dummy/app/controllers/overrides/confirmations_controller.rb b/test/dummy/app/controllers/overrides/confirmations_controller.rb
index af6648067..9d51f5e8c 100644
--- a/test/dummy/app/controllers/overrides/confirmations_controller.rb
+++ b/test/dummy/app/controllers/overrides/confirmations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Overrides
   class ConfirmationsController < DeviseTokenAuth::ConfirmationsController
     def show
diff --git a/test/dummy/app/controllers/overrides/omniauth_callbacks_controller.rb b/test/dummy/app/controllers/overrides/omniauth_callbacks_controller.rb
index 5fee2d4fe..3c27d3186 100644
--- a/test/dummy/app/controllers/overrides/omniauth_callbacks_controller.rb
+++ b/test/dummy/app/controllers/overrides/omniauth_callbacks_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Overrides
   class OmniauthCallbacksController < DeviseTokenAuth::OmniauthCallbacksController
     DEFAULT_NICKNAME = "stimpy"
diff --git a/test/dummy/app/controllers/overrides/passwords_controller.rb b/test/dummy/app/controllers/overrides/passwords_controller.rb
index 87471e00c..d568e6459 100644
--- a/test/dummy/app/controllers/overrides/passwords_controller.rb
+++ b/test/dummy/app/controllers/overrides/passwords_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Overrides
   class PasswordsController < DeviseTokenAuth::PasswordsController
     OVERRIDE_PROOF = "(^^,)"
diff --git a/test/dummy/app/controllers/overrides/registrations_controller.rb b/test/dummy/app/controllers/overrides/registrations_controller.rb
index 5c6be0ce4..429f12c11 100644
--- a/test/dummy/app/controllers/overrides/registrations_controller.rb
+++ b/test/dummy/app/controllers/overrides/registrations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Overrides
   class RegistrationsController < DeviseTokenAuth::RegistrationsController
     OVERRIDE_PROOF = "(^^,)"
diff --git a/test/dummy/app/controllers/overrides/sessions_controller.rb b/test/dummy/app/controllers/overrides/sessions_controller.rb
index faa2df58f..20b6fabda 100644
--- a/test/dummy/app/controllers/overrides/sessions_controller.rb
+++ b/test/dummy/app/controllers/overrides/sessions_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Overrides
   class SessionsController < DeviseTokenAuth::SessionsController
     OVERRIDE_PROOF = "(^^,)"
diff --git a/test/dummy/app/controllers/overrides/token_validations_controller.rb b/test/dummy/app/controllers/overrides/token_validations_controller.rb
index 7d65ca00a..bab35f595 100644
--- a/test/dummy/app/controllers/overrides/token_validations_controller.rb
+++ b/test/dummy/app/controllers/overrides/token_validations_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Overrides
   class TokenValidationsController < DeviseTokenAuth::TokenValidationsController
     OVERRIDE_PROOF = '(^^,)'
diff --git a/test/dummy/app/helpers/application_helper.rb b/test/dummy/app/helpers/application_helper.rb
index d180b1854..a0764ef32 100644
--- a/test/dummy/app/helpers/application_helper.rb
+++ b/test/dummy/app/helpers/application_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ApplicationHelper
   COLOR_NAMES = [
     "Acid green",
diff --git a/test/dummy/app/models/evil_user.rb b/test/dummy/app/models/evil_user.rb
index c483f6b04..60a41fe0d 100644
--- a/test/dummy/app/models/evil_user.rb
+++ b/test/dummy/app/models/evil_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class EvilUser < ActiveRecord::Base
   include DeviseTokenAuth::Concerns::User
 end
diff --git a/test/dummy/app/models/lockable_user.rb b/test/dummy/app/models/lockable_user.rb
index 79e34a6b2..1c53f5cb2 100644
--- a/test/dummy/app/models/lockable_user.rb
+++ b/test/dummy/app/models/lockable_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class LockableUser < ActiveRecord::Base
   # Include default devise modules.
   devise :database_authenticatable, :registerable, :lockable
diff --git a/test/dummy/app/models/mang.rb b/test/dummy/app/models/mang.rb
index 9dd3c18b6..26a2c14ef 100644
--- a/test/dummy/app/models/mang.rb
+++ b/test/dummy/app/models/mang.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Mang < ActiveRecord::Base
   include DeviseTokenAuth::Concerns::User
 end
diff --git a/test/dummy/app/models/nice_user.rb b/test/dummy/app/models/nice_user.rb
index a151ae1e2..300056732 100644
--- a/test/dummy/app/models/nice_user.rb
+++ b/test/dummy/app/models/nice_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class NiceUser < ActiveRecord::Base
   # Include default devise modules.
   devise :database_authenticatable, :registerable,
diff --git a/test/dummy/app/models/only_email_user.rb b/test/dummy/app/models/only_email_user.rb
index c6fee9c45..fc31239b2 100644
--- a/test/dummy/app/models/only_email_user.rb
+++ b/test/dummy/app/models/only_email_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class OnlyEmailUser < ActiveRecord::Base
   # Include default devise modules.
   devise :database_authenticatable, :registerable
diff --git a/test/dummy/app/models/scoped_user.rb b/test/dummy/app/models/scoped_user.rb
index 5dca1286f..44b22649d 100644
--- a/test/dummy/app/models/scoped_user.rb
+++ b/test/dummy/app/models/scoped_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ScopedUser < ActiveRecord::Base
   # Include default devise modules.
   devise :database_authenticatable, :registerable,
diff --git a/test/dummy/app/models/unconfirmable_user.rb b/test/dummy/app/models/unconfirmable_user.rb
index 64fb15e53..392d146e9 100644
--- a/test/dummy/app/models/unconfirmable_user.rb
+++ b/test/dummy/app/models/unconfirmable_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UnconfirmableUser < ActiveRecord::Base
   # Include default devise modules.
   devise :database_authenticatable, :registerable,
diff --git a/test/dummy/app/models/unregisterable_user.rb b/test/dummy/app/models/unregisterable_user.rb
index 44f596d40..659beea0f 100644
--- a/test/dummy/app/models/unregisterable_user.rb
+++ b/test/dummy/app/models/unregisterable_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UnregisterableUser < ActiveRecord::Base
   # Include default devise modules.
   devise :database_authenticatable,
diff --git a/test/dummy/app/models/user.rb b/test/dummy/app/models/user.rb
index 17df68f5e..679ba10e9 100644
--- a/test/dummy/app/models/user.rb
+++ b/test/dummy/app/models/user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class User < ActiveRecord::Base
   include DeviseTokenAuth::Concerns::User
 
diff --git a/test/dummy/config/application.rb b/test/dummy/config/application.rb
index ff7cd58d8..c212f34d4 100644
--- a/test/dummy/config/application.rb
+++ b/test/dummy/config/application.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require File.expand_path('../boot', __FILE__)
 
 require 'rack/cors'
diff --git a/test/dummy/config/boot.rb b/test/dummy/config/boot.rb
index 6266cfc50..18536532a 100644
--- a/test/dummy/config/boot.rb
+++ b/test/dummy/config/boot.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Set up gems listed in the Gemfile.
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../../Gemfile', __FILE__)
 
diff --git a/test/dummy/config/environment.rb b/test/dummy/config/environment.rb
index ee8d90dc6..3fa662183 100644
--- a/test/dummy/config/environment.rb
+++ b/test/dummy/config/environment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Load the Rails application.
 require File.expand_path('../application', __FILE__)
 
diff --git a/test/dummy/config/environments/development.rb b/test/dummy/config/environments/development.rb
index 4a908bafb..9a14a1bd5 100644
--- a/test/dummy/config/environments/development.rb
+++ b/test/dummy/config/environments/development.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
diff --git a/test/dummy/config/environments/production.rb b/test/dummy/config/environments/production.rb
index a6ed58747..fe23e903f 100644
--- a/test/dummy/config/environments/production.rb
+++ b/test/dummy/config/environments/production.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
diff --git a/test/dummy/config/environments/test.rb b/test/dummy/config/environments/test.rb
index 4fd5b040b..0d52cbc1d 100644
--- a/test/dummy/config/environments/test.rb
+++ b/test/dummy/config/environments/test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
diff --git a/test/dummy/config/initializers/assets.rb b/test/dummy/config/initializers/assets.rb
index d2f4ec33a..761905a73 100644
--- a/test/dummy/config/initializers/assets.rb
+++ b/test/dummy/config/initializers/assets.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Version of your assets, change this if you want to expire all your assets.
diff --git a/test/dummy/config/initializers/backtrace_silencers.rb b/test/dummy/config/initializers/backtrace_silencers.rb
index 59385cdf3..4b63f2893 100644
--- a/test/dummy/config/initializers/backtrace_silencers.rb
+++ b/test/dummy/config/initializers/backtrace_silencers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.
diff --git a/test/dummy/config/initializers/cookies_serializer.rb b/test/dummy/config/initializers/cookies_serializer.rb
index 7a06a89f0..0a23b25ec 100644
--- a/test/dummy/config/initializers/cookies_serializer.rb
+++ b/test/dummy/config/initializers/cookies_serializer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
-Rails.application.config.action_dispatch.cookies_serializer = :json
\ No newline at end of file
+Rails.application.config.action_dispatch.cookies_serializer = :json
diff --git a/test/dummy/config/initializers/devise.rb b/test/dummy/config/initializers/devise.rb
index d5c41f257..7663405c8 100644
--- a/test/dummy/config/initializers/devise.rb
+++ b/test/dummy/config/initializers/devise.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Devise.setup do |config|
   config.authentication_keys = [:email, :nickname]
 end
diff --git a/test/dummy/config/initializers/devise_token_auth.rb b/test/dummy/config/initializers/devise_token_auth.rb
index a34435e15..8b5521c98 100644
--- a/test/dummy/config/initializers/devise_token_auth.rb
+++ b/test/dummy/config/initializers/devise_token_auth.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 DeviseTokenAuth.setup do |config|
   # By default the authorization headers will change after each request. The
   # client is responsible for keeping track of the changing tokens. Change
diff --git a/test/dummy/config/initializers/figaro.rb b/test/dummy/config/initializers/figaro.rb
index 6c1e819d3..77000b344 100644
--- a/test/dummy/config/initializers/figaro.rb
+++ b/test/dummy/config/initializers/figaro.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 #Figaro.require("GITHUB_KEY", "GITHUB_SECRET", "FACEBOOK_KEY", "FACEBOOK_SECRET", "GOOGLE_KEY", "GOOGLE_SECRET")
diff --git a/test/dummy/config/initializers/filter_parameter_logging.rb b/test/dummy/config/initializers/filter_parameter_logging.rb
index 4a994e1e7..7a4f47b4c 100644
--- a/test/dummy/config/initializers/filter_parameter_logging.rb
+++ b/test/dummy/config/initializers/filter_parameter_logging.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Configure sensitive parameters which will be filtered from the log file.
diff --git a/test/dummy/config/initializers/inflections.rb b/test/dummy/config/initializers/inflections.rb
index ac033bf9d..dc8474221 100644
--- a/test/dummy/config/initializers/inflections.rb
+++ b/test/dummy/config/initializers/inflections.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections
diff --git a/test/dummy/config/initializers/mime_types.rb b/test/dummy/config/initializers/mime_types.rb
index dc1899682..be6fedc53 100644
--- a/test/dummy/config/initializers/mime_types.rb
+++ b/test/dummy/config/initializers/mime_types.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Add new mime types for use in respond_to blocks:
diff --git a/test/dummy/config/initializers/omniauth.rb b/test/dummy/config/initializers/omniauth.rb
index 93376412f..0a3d1dd5c 100644
--- a/test/dummy/config/initializers/omniauth.rb
+++ b/test/dummy/config/initializers/omniauth.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.config.middleware.use OmniAuth::Builder do |b|
   provider :github,        ENV['GITHUB_KEY'],   ENV['GITHUB_SECRET'],   scope: 'email,profile'
   provider :facebook,      ENV['FACEBOOK_KEY'], ENV['FACEBOOK_SECRET']
diff --git a/test/dummy/config/initializers/session_store.rb b/test/dummy/config/initializers/session_store.rb
index e766b67b1..969d977f5 100644
--- a/test/dummy/config/initializers/session_store.rb
+++ b/test/dummy/config/initializers/session_store.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 Rails.application.config.session_store :cookie_store, key: '_dummy_session'
diff --git a/test/dummy/config/initializers/wrap_parameters.rb b/test/dummy/config/initializers/wrap_parameters.rb
index 33725e95f..246168a42 100644
--- a/test/dummy/config/initializers/wrap_parameters.rb
+++ b/test/dummy/config/initializers/wrap_parameters.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # This file contains settings for ActionController::ParamsWrapper which
diff --git a/test/dummy/config/routes.rb b/test/dummy/config/routes.rb
index c0b6472ea..5f4f48d45 100644
--- a/test/dummy/config/routes.rb
+++ b/test/dummy/config/routes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.routes.draw do
   # when using multiple models, controllers will default to the first available
   # devise mapping. routes for subsequent devise mappings will need to defined
diff --git a/test/dummy/config/spring.rb b/test/dummy/config/spring.rb
index 0a67539ff..c337c61d2 100644
--- a/test/dummy/config/spring.rb
+++ b/test/dummy/config/spring.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 Spring.application_root = './test/dummy'
diff --git a/test/dummy/db/migrate/20140715061447_devise_token_auth_create_users.rb b/test/dummy/db/migrate/20140715061447_devise_token_auth_create_users.rb
index 87b65272c..7e3486e7b 100644
--- a/test/dummy/db/migrate/20140715061447_devise_token_auth_create_users.rb
+++ b/test/dummy/db/migrate/20140715061447_devise_token_auth_create_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20140715061805_devise_token_auth_create_mangs.rb b/test/dummy/db/migrate/20140715061805_devise_token_auth_create_mangs.rb
index d820b8bfa..1952a61e2 100644
--- a/test/dummy/db/migrate/20140715061805_devise_token_auth_create_mangs.rb
+++ b/test/dummy/db/migrate/20140715061805_devise_token_auth_create_mangs.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateMangs < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20140829044006_add_operating_thetan_to_user.rb b/test/dummy/db/migrate/20140829044006_add_operating_thetan_to_user.rb
index df644d592..163ba4103 100644
--- a/test/dummy/db/migrate/20140829044006_add_operating_thetan_to_user.rb
+++ b/test/dummy/db/migrate/20140829044006_add_operating_thetan_to_user.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddOperatingThetanToUser < ActiveRecord::Migration[4.2]
   def change
     add_column :users, :operating_thetan, :integer
diff --git a/test/dummy/db/migrate/20140916224624_add_favorite_color_to_mangs.rb b/test/dummy/db/migrate/20140916224624_add_favorite_color_to_mangs.rb
index eb97800a1..16365929d 100644
--- a/test/dummy/db/migrate/20140916224624_add_favorite_color_to_mangs.rb
+++ b/test/dummy/db/migrate/20140916224624_add_favorite_color_to_mangs.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddFavoriteColorToMangs < ActiveRecord::Migration[4.2]
   def change
     add_column :mangs, :favorite_color, :string
diff --git a/test/dummy/db/migrate/20140928231203_devise_token_auth_create_evil_users.rb b/test/dummy/db/migrate/20140928231203_devise_token_auth_create_evil_users.rb
index 216eccdad..e90f47249 100644
--- a/test/dummy/db/migrate/20140928231203_devise_token_auth_create_evil_users.rb
+++ b/test/dummy/db/migrate/20140928231203_devise_token_auth_create_evil_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateEvilUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20141222035835_devise_token_auth_create_only_email_users.rb b/test/dummy/db/migrate/20141222035835_devise_token_auth_create_only_email_users.rb
index 2518ebb33..0d6d88649 100644
--- a/test/dummy/db/migrate/20141222035835_devise_token_auth_create_only_email_users.rb
+++ b/test/dummy/db/migrate/20141222035835_devise_token_auth_create_only_email_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateOnlyEmailUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20141222053502_devise_token_auth_create_unregisterable_users.rb b/test/dummy/db/migrate/20141222053502_devise_token_auth_create_unregisterable_users.rb
index 19c7c46b2..c9e0ec4de 100644
--- a/test/dummy/db/migrate/20141222053502_devise_token_auth_create_unregisterable_users.rb
+++ b/test/dummy/db/migrate/20141222053502_devise_token_auth_create_unregisterable_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateUnregisterableUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20150409095712_devise_token_auth_create_nice_users.rb b/test/dummy/db/migrate/20150409095712_devise_token_auth_create_nice_users.rb
index 81c3b47c4..d4e816245 100644
--- a/test/dummy/db/migrate/20150409095712_devise_token_auth_create_nice_users.rb
+++ b/test/dummy/db/migrate/20150409095712_devise_token_auth_create_nice_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateNiceUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20150708104536_devise_token_auth_create_unconfirmable_users.rb b/test/dummy/db/migrate/20150708104536_devise_token_auth_create_unconfirmable_users.rb
index 34ca72b89..bdc06b995 100644
--- a/test/dummy/db/migrate/20150708104536_devise_token_auth_create_unconfirmable_users.rb
+++ b/test/dummy/db/migrate/20150708104536_devise_token_auth_create_unconfirmable_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateUnconfirmableUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20160103235141_devise_token_auth_create_scoped_users.rb b/test/dummy/db/migrate/20160103235141_devise_token_auth_create_scoped_users.rb
index 31c7f750d..8aadb08f9 100644
--- a/test/dummy/db/migrate/20160103235141_devise_token_auth_create_scoped_users.rb
+++ b/test/dummy/db/migrate/20160103235141_devise_token_auth_create_scoped_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateScopedUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/db/migrate/20160629184441_devise_token_auth_create_lockable_users.rb b/test/dummy/db/migrate/20160629184441_devise_token_auth_create_lockable_users.rb
index 990844135..5309aae72 100644
--- a/test/dummy/db/migrate/20160629184441_devise_token_auth_create_lockable_users.rb
+++ b/test/dummy/db/migrate/20160629184441_devise_token_auth_create_lockable_users.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 include MigrationDatabaseHelper
 
 class DeviseTokenAuthCreateLockableUsers < ActiveRecord::Migration[4.2]
diff --git a/test/dummy/lib/migration_database_helper.rb b/test/dummy/lib/migration_database_helper.rb
index fba916c25..7af096f67 100644
--- a/test/dummy/lib/migration_database_helper.rb
+++ b/test/dummy/lib/migration_database_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # polyfill Rails >= 5 versioned migrations
 
 unless ActiveRecord::Migration.respond_to?(:[])
@@ -38,4 +40,4 @@ def database_name
   def database_version
     ActiveRecord::Base.connection.select_value('SELECT VERSION()')
   end
-end
\ No newline at end of file
+end
diff --git a/test/integration/navigation_test.rb b/test/integration/navigation_test.rb
index 97a94c9bb..51aed4b7b 100644
--- a/test/integration/navigation_test.rb
+++ b/test/integration/navigation_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class NavigationTest < ActionDispatch::IntegrationTest
diff --git a/test/lib/devise_token_auth/url_test.rb b/test/lib/devise_token_auth/url_test.rb
index 6f75a4526..262dd9b3d 100644
--- a/test/lib/devise_token_auth/url_test.rb
+++ b/test/lib/devise_token_auth/url_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class DeviseTokenAuth::UrlTest < ActiveSupport::TestCase
diff --git a/test/lib/generators/devise_token_auth/install_generator_test.rb b/test/lib/generators/devise_token_auth/install_generator_test.rb
index ac08adc55..d540767fd 100644
--- a/test/lib/generators/devise_token_auth/install_generator_test.rb
+++ b/test/lib/generators/devise_token_auth/install_generator_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'fileutils'
 require 'generators/devise_token_auth/install_generator'
diff --git a/test/lib/generators/devise_token_auth/install_generator_with_namespace_test.rb b/test/lib/generators/devise_token_auth/install_generator_with_namespace_test.rb
index af734f38e..ac1cd8e3b 100644
--- a/test/lib/generators/devise_token_auth/install_generator_with_namespace_test.rb
+++ b/test/lib/generators/devise_token_auth/install_generator_with_namespace_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'fileutils'
 require 'generators/devise_token_auth/install_generator'
diff --git a/test/lib/generators/devise_token_auth/install_views_generator_test.rb b/test/lib/generators/devise_token_auth/install_views_generator_test.rb
index 33e2c7102..564b2ca0b 100644
--- a/test/lib/generators/devise_token_auth/install_views_generator_test.rb
+++ b/test/lib/generators/devise_token_auth/install_views_generator_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'fileutils'
 require 'generators/devise_token_auth/install_views_generator'
diff --git a/test/models/only_email_user_test.rb b/test/models/only_email_user_test.rb
index 9575c9ec6..bae9da3d2 100644
--- a/test/models/only_email_user_test.rb
+++ b/test/models/only_email_user_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class OnlyEmailUserTest < ActiveSupport::TestCase
diff --git a/test/models/user_test.rb b/test/models/user_test.rb
index e6269bdb8..6309ae6e3 100644
--- a/test/models/user_test.rb
+++ b/test/models/user_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class UserTest < ActiveSupport::TestCase
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 479224a07..9b9bc8e93 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'simplecov'
 
 SimpleCov.start 'rails'