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-rw-r--r--test/unit/mailbox/state_test.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/unit/mailbox/state_test.rb b/test/unit/mailbox/state_test.rb
index 32d16ca8fe..78b7d21cd7 100644
--- a/test/unit/mailbox/state_test.rb
+++ b/test/unit/mailbox/state_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require_relative '../../test_helper'
class SuccessfulMailbox < ActionMailbox::Base