gistfile1.txt

# Service model

require 'nokogiri'
require 'open-uri'

class Service < ActiveRecord::Base
  
  def self.download
    
    items = []
    elements.each do |element|
      items << element
    end
    items
    
  end
  
  def self.elements
    document.css('item')
  end
  
  def self.document
    Nokogiri::XML(open('http://twitter.com/statuses/user_timeline/andypearson.rss'))
  end
  
end

# Service spec

require File.dirname(__FILE__) + '/../spec_helper'

describe Service do
  
  describe 'self.download' do
    
    it 'should respond to the download method' do
      Service.should respond_to(:download)
    end
    
    it 'should return an array of items' do
      Service.download.should be_an_instance_of(Array)
    end
    
    it 'should return an array of 3 items if there are 3 item elements in the document' do
      Service.stub!(:document).and_return(Nokogiri::HTML('<item>1</item><item>2</item><item>3</item>'))
      Service.download.length.should == 3
    end
    
  end
  
  describe 'self.document' do
    
    before do
      Service.stub!(:open).and_return('<item>1</item>')
    end
    
    it 'should respond to the document method' do
      Service.should respond_to(:document)
    end
    
    it 'should return an instance of Nokogiri::XML::Document' do
      Service.document.should be_an_instance_of(Nokogiri::XML::Document)
    end
  
  end
  
  describe 'self.elements' do
    
    before do
      Service.stub!(:document).and_return(Nokogiri::HTML('<item>1</item>'))
    end
    
    it 'should respond to the elements method' do
      Service.should respond_to(:elements)
    end
    
    it 'should return an instance of Nokogiri::XML::NodeSet' do
      Service.elements.should be_an_instance_of(Nokogiri::XML::NodeSet)
    end
    
  end
  
end