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-rw-r--r--activesupport/test/core_ext/object/deep_dup_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/object/deep_dup_test.rb b/activesupport/test/core_ext/object/deep_dup_test.rb
index f247ee16de..d6f0a71c5b 100644
--- a/activesupport/test/core_ext/object/deep_dup_test.rb
+++ b/activesupport/test/core_ext/object/deep_dup_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "abstract_unit"
require "active_support/core_ext/object"