Rails - Mar 2010 - stubbing CAPTCHA to pass Cucumber scenario

Hi,
I''m trying to start using cucumber. I''ve done login, logout
scenarious,
but stumbled in CAPTCHA validation on user registration page. As I get I
should stub CAPTCHA validation method. I guess I should implement
stubbing Given step or include stubbing code in Before filter?

I use validates_captcha gem, thus instance method to stub is

module ValidatesCaptcha
  module ModelValidation
    module InstanceMethods
      private
      def validate_captcha
        # doing nothing means passing
      end
    end
  end
end

I''ve read these posts
http://vinsol.com/blog/2006/07/21/rails-captcha-and-testing-using-mock-objects/
http://www.brynary.com/2009/2/3/cucumber-step-definition-tip-stubbing-time
but still don''t get where should I put stubbing code, should I call
stub! method and if so, of which object?
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