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-rw-r--r--actioncable/test/stubs/test_server.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actioncable/test/stubs/test_server.rb b/actioncable/test/stubs/test_server.rb
index 5bf2a151dc..0bc4625e28 100644
--- a/actioncable/test/stubs/test_server.rb
+++ b/actioncable/test/stubs/test_server.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "ostruct"
class TestServer