final

proxy.rb

class Proxy

  attr_reader :messages

  def initialize(target_object)
    @object = target_object
    @messages = []
  end

  def called?(name)
    @messages.include?(name)
  end

  def number_of_times_called(name)
    @messages.count(name)
  end

  def method_missing(name, *args, &block)
    @messages << name
    @object.send(name, *args, &block)
  end

end