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-rw-r--r--test/stringio/test_stringio.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/stringio/test_stringio.rb b/test/stringio/test_stringio.rb
index bd4a0f1a51..17ae9ab848 100644
--- a/test/stringio/test_stringio.rb
+++ b/test/stringio/test_stringio.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require 'stringio'
require_relative '../ruby/ut_eof'