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-rw-r--r--test/socket/test_udp.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/socket/test_udp.rb b/test/socket/test_udp.rb
index 56933375d77..5b23cce2887 100644
--- a/test/socket/test_udp.rb
+++ b/test/socket/test_udp.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
begin
require "socket"
require "test/unit"