我可以使用什么动态语言进行.NET单元测试？

I am trying to write some complicated acceptance tests for my C# code. I notice that when I am writing my tests I am doing a lot of explicit casting to satisfy the C# compiler. I like the type-safety I get in my production code with a statically-typed language like C#, but for my tests I would be happy to use a dynamically-typed language (e.g. IronPython or IronRuby) to avoid all the explicit casting. If my test calls a method that doesn't exist on an object, it would be OK for the code to fail at run time (it's just a failing test). I am currently using MS Test as my unit testing framework, and it would be convenient if I could continue to use it. What dynamic (DLR-based) language can I use that will integrate with MS Test? Feel free to suggest a different testing framework, if you think that would help.I am trying to write some complicated acceptanc