gistfile1.rbx

require 'rubygems'
require 'taza'

class Google < Taza::Site
  def initialize(brand)
    brand_url = Google.settings["#{brand}_url".to_sym]
    super(:url => brand_url)
  end
end

module Spec::Example::ExampleGroupMethods
  def all_brands(description, &block)
    [:usa,:canada].each do |brand|
      new_block = Proc.new { block.call(brand) }
      it("#{brand} -- #{description}",&new_block)
    end
  end
end

gistfile2.txt

---
isolation:
    :usa_url: http://www.google.com
    :canada_url: http://www.google.ca

gistfile3.rbx

require 'spec/spec_helper'
require 'google'

describe "HomePage" do
  all_brands "should fail because you haven't written any tests yet" do |brand|
    Google.new(brand) do |google|
      puts "Hey guys I'm at this url: #{google.browser.url}"
    end
  end
end