Based on my experice in open source developing, I had a lot of fun for doing it. Also I'd like to address some improtant comments when I was working on the open source.

: This project has no prototype or even any example; most of time I couldn't get help because very less people work on this; and different people will do a different way in unit testing. It took me a lot of time to do researching, trying, and debugging. It also needs a lot of patience; if one way doesn't work, you still need to keep working on it until find the solution. You can take a short break and a deep breath, but never give up.

* Documentation.