[Zope] about unit test

Hi! I download several products and find some of them own a "tests" directory. I think there are the files for unit test. Any guru can show me how to do a unit test in zope? Maybe you can give me a link to read :) Thanks! ===== Remote Scensing Satellite Ground Station Chinese Academy of Science _________________________________________________________ Do You Yahoo!? 更多惊喜，同样精彩，NetVista A30 热卖 http://ad.cn.doubleclick.net/clk;5313999;7930402;p?http://www.ibm.com/cn/pro...