Make it possible to run test app on its own

spec/spec_helper.rb

@@ -3,8 +3,6 @@ $:.unshift(File.dirname(__FILE__))
 
 require 'rubygems'
 require 'webcat'
-require 'sinatra/base'
-require 'rack'
 require 'test_app'
 require 'drivers_spec'
 require 'session_spec'

spec/test_app.rb

@@ -1,3 +1,6 @@
+require 'sinatra/base'
+require 'rack'
+
 class TestApp < Sinatra::Base
   set :root, File.dirname(__FILE__)
   set :static, true
@@ -30,3 +33,7 @@ class TestApp < Sinatra::Base
     params[:form].to_yaml
   end
 end
+
+if __FILE__ == $0
+  Rack::Handler::Mongrel.run TestApp, :Port => 8070
+end