Create unit tests to detect bugs in the library.

[itssamuelrowe]

JTK was created to write a compiler for a language that I designing. It's been three years since I started working on the project. Given my schedule, I am not able to work on both Zen and JTK. And writing unit tests is out of the question for now. For the most part, JTK seems to work fine. However, I come across bugs every now. It would be really helpful if someone could help me write unit tests to detect bugs.