Yii2框架下,使用Codeception进行单元测试:http://tangl163.iteye.com/blog/2288538
Yii2中如何使用CodeCeption:http://hustnaive.github.io/php/2015/06/16/work-with-yii-and-codeception.html
codeception (3)在yii2下创建Unit Tests (单元测试):https://segmentfault.com/a/1190000005926883