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-rw-r--r--activerecord/test/cases/json_serialization_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/test/cases/json_serialization_test.rb b/activerecord/test/cases/json_serialization_test.rb
index 9b4b61b16e..2ca95fe3b4 100644
--- a/activerecord/test/cases/json_serialization_test.rb
+++ b/activerecord/test/cases/json_serialization_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "cases/helper"
require "models/contact"
require "models/post"