build in self test

• 内建自测试

build in self test的用法和样例：

例句

1. If I can get that copy of the session key, I can build my own authenticators, and if I can build my own authenticators, I can break the system.
   如果我能得到那份会话密钥，我就能用它来建自已的验证器，如果我能建自已的验证器，我就能攻破你的系统。