JUnit Factory

One of the interesting utility about software testing is JUnit factory:

http://www.junitfactory.com

It supposed to automatically generate JUnit test cases.
It sounds great.
And it works in small program.
But once I tried to use in my Graphics Project, it didn't work. The reason was that I have used external library such as SWING and vecmath libraries.
Since it is almost impossible to make a program without using any external library, I concluded JUnit factory is bad.
It is interesting in principal not in practical.

It is still tough challenge to generate test cases automatically.