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-rw-r--r--railties/lib/rails/generators/test_unit/mailer/templates/preview.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/railties/lib/rails/generators/test_unit/mailer/templates/preview.rb b/railties/lib/rails/generators/test_unit/mailer/templates/preview.rb
index b063cbc47b..9876210b6c 100644
--- a/railties/lib/rails/generators/test_unit/mailer/templates/preview.rb
+++ b/railties/lib/rails/generators/test_unit/mailer/templates/preview.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
<% module_namespacing do -%>
# Preview all emails at http://localhost:3000/rails/mailers/<%= file_path %>_mailer
class <%= class_name %>MailerPreview < ActionMailer::Preview