nHibernate在单元测试期间输出sql日志记录

I'm running unit tests from inside VS2008 against a nHibernate application and would like to turn on logging during the unit tests so I can see a bit more of what is going on. I've copied and pasted another application's app.config that successfully logs nhibernate information into the unit tests app.config, but still don't get any output. I'm running unit tests from inside VS2008 again