rspec

https://github.com/rspec/rspec-rails

http://clark1231.iteye.com/blog/1443179

http://hi.baidu.com/jspring/blog/item/5a77e3b4034105748bd4b2a5.html

http://www.cnblogs.com/xingluzhe/archive/2009/08/19/1549669.html