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-rw-r--r--test/net/smtp/test_smtp.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/net/smtp/test_smtp.rb b/test/net/smtp/test_smtp.rb
index d8bb0c192c..0edb3419d5 100644
--- a/test/net/smtp/test_smtp.rb
+++ b/test/net/smtp/test_smtp.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'net/smtp'
require 'stringio'
require 'test/unit'