Well, if what you're after is some "quick yet exhaustive" test in order to set your code straight, I'd sugest testing for some known unique solutions.
That will give you something to start, and when the code is passing all those fixed tests, you can move on to the "larger" validation...

I can post a set of such unique solutions, if you guys want...
_________________________
Later,   [b]Mad[/b]ruga