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-rw-r--r--lib/rdoc/markup/text_formatter_test_case.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rdoc/markup/text_formatter_test_case.rb b/lib/rdoc/markup/text_formatter_test_case.rb
index 4abf42563b..1c8882aa36 100644
--- a/lib/rdoc/markup/text_formatter_test_case.rb
+++ b/lib/rdoc/markup/text_formatter_test_case.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
##
# Test case for creating new plain-text RDoc::Markup formatters. See also
# RDoc::Markup::FormatterTestCase