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-rw-r--r--lib/action_mailbox/test_case.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/action_mailbox/test_case.rb b/lib/action_mailbox/test_case.rb
index 1b3aec1393..a501e8a7ca 100644
--- a/lib/action_mailbox/test_case.rb
+++ b/lib/action_mailbox/test_case.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "action_mailbox/test_helper"
require "active_support/test_case"