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-rw-r--r--spec/mailers/previews/admin_mailer_preview.rb2
-rw-r--r--spec/mailers/previews/notification_mailer_preview.rb2
-rw-r--r--spec/mailers/previews/user_mailer_preview.rb2
3 files changed, 6 insertions, 0 deletions
diff --git a/spec/mailers/previews/admin_mailer_preview.rb b/spec/mailers/previews/admin_mailer_preview.rb
index 0ec9e9882..9572768cd 100644
--- a/spec/mailers/previews/admin_mailer_preview.rb
+++ b/spec/mailers/previews/admin_mailer_preview.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Preview all emails at http://localhost:3000/rails/mailers/admin_mailer
 
 class AdminMailerPreview < ActionMailer::Preview
diff --git a/spec/mailers/previews/notification_mailer_preview.rb b/spec/mailers/previews/notification_mailer_preview.rb
index e31445c36..bc41662a1 100644
--- a/spec/mailers/previews/notification_mailer_preview.rb
+++ b/spec/mailers/previews/notification_mailer_preview.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Preview all emails at http://localhost:3000/rails/mailers/notification_mailer
 
 class NotificationMailerPreview < ActionMailer::Preview
diff --git a/spec/mailers/previews/user_mailer_preview.rb b/spec/mailers/previews/user_mailer_preview.rb
index 95712e6cf..098c9cd90 100644
--- a/spec/mailers/previews/user_mailer_preview.rb
+++ b/spec/mailers/previews/user_mailer_preview.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Preview all emails at http://localhost:3000/rails/mailers/user_mailer
 
 class UserMailerPreview < ActionMailer::Preview