Preferred framework for Unit Tests

Hello Community,

I wanted to know what are the preferred framework that we can opt to develop unit test classes for Windchill code. So far, I used Junit 4.0 to develop test classes but I am encountering many issues when I try to mock Windchill classes like VersionControlHelper, WTState etc. Has anyone in our community developed Junit tests with mocking of all classes instead of using actual Windchill objects' data?

Looking forward to your response.

Thanks,

Hari