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-rw-r--r--actioncable/test/subscription_adapter/subscriber_map_test.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actioncable/test/subscription_adapter/subscriber_map_test.rb b/actioncable/test/subscription_adapter/subscriber_map_test.rb
index 76b984c849..ed81099cbc 100644
--- a/actioncable/test/subscription_adapter/subscriber_map_test.rb
+++ b/actioncable/test/subscription_adapter/subscriber_map_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "test_helper"
class SubscriberMapTest < ActionCable::TestCase