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-rw-r--r--test/openssl/test_hmac.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/openssl/test_hmac.rb b/test/openssl/test_hmac.rb
index f709ebd69b..135d26f02c 100644
--- a/test/openssl/test_hmac.rb
+++ b/test/openssl/test_hmac.rb
@@ -1,4 +1,5 @@
# coding: UTF-8
+# frozen_string_literal: false
require_relative 'utils'