使用groovy作为核心测试语言的经验？

I think I am not the only one who is gonna ask this question next time. After some experience with RoR I am impressed with the power of dynamic languages. Lots of projects are still forced for different reasons to use a java technology stack though. Since testing is an important part of any project I would like to hear your experience about building an enterprise project with groovy as main testing language and NOT in production code. It think this is a perfect scenario to start with this language. How was your experience for this constellation, specially regarding following points:I think I am not the only one who is gonna ask