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-rw-r--r--activesupport/test/callback_inheritance_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/callback_inheritance_test.rb b/activesupport/test/callback_inheritance_test.rb
index 9e2f7527e0..8872a16282 100644
--- a/activesupport/test/callback_inheritance_test.rb
+++ b/activesupport/test/callback_inheritance_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "abstract_unit"
class GrandParent