def evaluate(actual, expected)
      if actual.respond_to?(expected)
        pass(new_message.responds_to(expected))
      else
        fail(expected_message.method(expected).is_not_defined)
      end
    end
def evaluate(actual, expected)
      if actual.respond_to?(expected)
        pass(new_message.responds_to(expected))
      else
        fail(expected_message.method(expected).is_not_defined)
      end
    end
(see Riot::AssertionMacro#evaluate)
 @param [Symbol, String] expected the method name that actual should respond to