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-rw-r--r--actionmailer/test/mailers/asset_mailer.rb2
1 files changed, 2 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"