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-rw-r--r--activemodel/test/cases/serializers/xml_serialization_test.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activemodel/test/cases/serializers/xml_serialization_test.rb b/activemodel/test/cases/serializers/xml_serialization_test.rb
index 22fca5bd17..37faf6cef8 100644
--- a/activemodel/test/cases/serializers/xml_serialization_test.rb
+++ b/activemodel/test/cases/serializers/xml_serialization_test.rb
@@ -2,6 +2,7 @@ require 'cases/helper'
require 'models/contact'
require 'active_support/core_ext/object/instance_variables'
require 'ostruct'
+require 'yaml'
module Admin
class Contact < ::Contact