Add the frozen_string_literal pragma comment to all Ruby files. (#4725)

test/integration/authenticatable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class AuthenticationSanityTest < Devise::IntegrationTest

test/integration/confirmable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class ConfirmationTest < Devise::IntegrationTest

test/integration/database_authenticatable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class DatabaseAuthenticationTest < Devise::IntegrationTest

test/integration/http_authenticatable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class HttpAuthenticationTest < Devise::IntegrationTest

test/integration/lockable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class LockTest < Devise::IntegrationTest

test/integration/mounted_engine_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class MyMountableEngine

test/integration/omniauthable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 

test/integration/recoverable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class PasswordTest < Devise::IntegrationTest

test/integration/registerable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class RegistrationTest < Devise::IntegrationTest

test/integration/rememberable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class RememberMeTest < Devise::IntegrationTest

test/integration/timeoutable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class SessionTimeoutTest < Devise::IntegrationTest

test/integration/trackable_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class TrackableHooksTest < Devise::IntegrationTest