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-rw-r--r--actionmailer/test/mailers/delayed_mailer.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionmailer/test/mailers/delayed_mailer.rb b/actionmailer/test/mailers/delayed_mailer.rb
index cae4ec2f48..21eded8d05 100644
--- a/actionmailer/test/mailers/delayed_mailer.rb
+++ b/actionmailer/test/mailers/delayed_mailer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_job/arguments"
class DelayedMailerError < StandardError; end