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-rw-r--r--test/workbook/worksheet/tc_data_validation.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/test/workbook/worksheet/tc_data_validation.rb b/test/workbook/worksheet/tc_data_validation.rb
index 90fea502..4be68673 100644
--- a/test/workbook/worksheet/tc_data_validation.rb
+++ b/test/workbook/worksheet/tc_data_validation.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require 'tc_helper'
require 'support/capture_warnings'