awesome_resources_spec.rb

module AwesomeResource
  def initialize(attributes = {})
    attributes.each do |key, val|
      reader = key
      writer = "#{key}="

      unless respond_to?(reader)
        self.class.send(:attr_reader, key)
      end

      unless respond_to?(writer)
        self.class.send(:attr_writer, key)
      end

      send(writer, val)
    end
  end
end

describe AwesomeResource do
  it "creates readers and writers for any attributes passed in during initialization" do
    article_class = Class.new do
      include AwesomeResource
    end

    article = article_class.new("title" => "Fun")
    article.title.should == "Fun"

    article.title = 'Fun Times!'
    article.title.should == 'Fun Times!'

    expect { article.unknown_attribute }.to raise_exception
  end
end