A modular way to write helpers

helpers.rb

module Authorization
  module Service
    class << self
      def authorize(name)
        case name
          when 'timuruski', 'stevejobs' then "authorized"
          else "unauthorized"
        end
      end
    end
  end
  
  module Helpers
    def authorize
      Service.authorize(params[:name])
    end
  end
end

require 'rubygems'
require 'sinatra'

class MyApp < Sinatra::Base
  helpers Authorization::Helpers
  
  before do
    @authorized = authorize
  end
  
  get "/" do
    @authorized
  end
  
  run! if app_file == $0
end

helpers_spec.rb

require 'helpers'
require 'rack/test'

def app
  MyApp
end

describe Authorization::Helpers do
  include Rack::Test::Methods
  
  it "can be stubbed" do
    Authorization::Service.stub(:authorize).and_return { 'walrus' }
    get "/", {:name => 'timuruski' }
    last_response.body.should == 'walrus'
  end
end