script.rb

#!/usr/bin/env ruby

# In order to make this script run stand alone it needs to run in the context of the gem set that has 'fog' installed.
# However to run as an included file in a spec file it will already need to be in that gemset

if $0 == __FILE__
  require 'rvm'

  File.open(File.join(File.dirname(__FILE__), '..', '.rvmrc')) do |f|
    @rvmrc_gemset = f.read.match(/(ruby[^ ]+)/)[1]
  end

  RVM.current.use! @rvmrc_gemset
  end
end
require 'rubygems'
require 'fog'

# Do some fun scripting stuff with fog!
Class Servers
  def new
    server = Compute[:aws].servers.create(:image_id => 'ami-5ee70037')
  end
end

script_spec.rb

require 'script.rb'

describe "my test" do
  it 'is a fake test' do
    Servers.new.should
  end
end