6 files changed, 12 insertions, 0 deletions
diff --git a/actionmailer/test/mailers/asset_mailer.rb b/actionmailer/test/mailers/asset_mailer.rb
index 1cf15128d2..7a9aba2629 100644
--- a/actionmailer/test/mailers/asset_mailer.rb
+++ b/actionmailer/test/mailers/asset_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AssetMailer < ActionMailer::Base
   self.mailer_name = "asset_mailer"
 
diff --git a/actionmailer/test/mailers/base_mailer.rb b/actionmailer/test/mailers/base_mailer.rb
index 2a8884959c..bfaecdb658 100644
--- a/actionmailer/test/mailers/base_mailer.rb
+++ b/actionmailer/test/mailers/base_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class BaseMailer < ActionMailer::Base
   self.mailer_name = "base_mailer"
 
diff --git a/actionmailer/test/mailers/caching_mailer.rb b/actionmailer/test/mailers/caching_mailer.rb
index 92d3cff7c9..02f0c6c103 100644
--- a/actionmailer/test/mailers/caching_mailer.rb
+++ b/actionmailer/test/mailers/caching_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CachingMailer < ActionMailer::Base
   self.mailer_name = "caching_mailer"
 
diff --git a/actionmailer/test/mailers/delayed_mailer.rb b/actionmailer/test/mailers/delayed_mailer.rb
index cae4ec2f48..b0f5ecc2fb 100644
--- a/actionmailer/test/mailers/delayed_mailer.rb
+++ b/actionmailer/test/mailers/delayed_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_job/arguments"
 
 class DelayedMailerError < StandardError; end
diff --git a/actionmailer/test/mailers/params_mailer.rb b/actionmailer/test/mailers/params_mailer.rb
index 4c0fae6d91..84aa336311 100644
--- a/actionmailer/test/mailers/params_mailer.rb
+++ b/actionmailer/test/mailers/params_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ParamsMailer < ActionMailer::Base
   before_action { @inviter, @invitee = params[:inviter], params[:invitee] }
 
diff --git a/actionmailer/test/mailers/proc_mailer.rb b/actionmailer/test/mailers/proc_mailer.rb
index 2487db9eb9..b7cf53eb4a 100644
--- a/actionmailer/test/mailers/proc_mailer.rb
+++ b/actionmailer/test/mailers/proc_mailer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ProcMailer < ActionMailer::Base
   default to: "system@test.lindsaar.net",
           "X-Proc-Method" => Proc.new { Time.now.to_i.to_s },