clear_instance_variables_between_requests

# File actionpack/lib/action_controller/metal/testing.rb, line 7
      def clear_instance_variables_between_requests
        if defined?(@_ivars)
          new_ivars = instance_variables - @_ivars
          new_ivars.each { |ivar| remove_instance_variable(ivar) }
        end

        @_ivars = instance_variables
      end