Correct mocking of no-op RackApplicationFactory

Signed-off-by: Chad Wilson <chadw@thoughtworks.com>

Author: chadlwilson

src/spec/ruby/rack/application_spec.rb

@@ -562,7 +562,7 @@ def reset_config
   it "should init and create application object" do
     # NOTE: a workaround to be able to mock it :
     klass = Class.new(RailsRackApplicationFactory) do
-      def createRackServletWrapper(runtime, rackup); end
+      def createRackServletWrapper(runtime, rackup, filename); end
     end
     @app_factory = klass.new