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-rw-r--r--activemodel/test/cases/serialization_test.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activemodel/test/cases/serialization_test.rb b/activemodel/test/cases/serialization_test.rb
index f78efd2f0c..9002982e7f 100644
--- a/activemodel/test/cases/serialization_test.rb
+++ b/activemodel/test/cases/serialization_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
require "cases/helper"
require "active_support/core_ext/object/instance_variables"