diff --git a/test/test_helper.rb b/test/test_helper.rb
index 2b80c851e..72ac6ec70 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -483,3 +483,11 @@ end
 # Simple module to "namespace" all of the API tests
 module ApiTest
 end
+
+module ActionController
+  class TestUploadedFile
+    def respond_to?(method_name)
+      @tempfile.respond_to?(method_name) || super
+    end
+  end
+end