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-rw-r--r--activerecord/test/cases/helper.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 5a3b8e3fb5..84a784e6d5 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "config"
require "stringio"