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-rw-r--r--actioncable/test/subscription_adapter/common.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actioncable/test/subscription_adapter/common.rb b/actioncable/test/subscription_adapter/common.rb
index 3aa88c2caa..10639cb112 100644
--- a/actioncable/test/subscription_adapter/common.rb
+++ b/actioncable/test/subscription_adapter/common.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "test_helper"
require "concurrent"