At the end of the full run, it should tell you the overall status of your tests, and it should tell you which (if any) mutations managed to still get your tests to pass.
Passed : 2
Failed : 8
Improve the tests and try again.
The following mutations didn't cause test failures:
Mutating line 10
subclasses = descendants >>> subclasses = nil
This is the way Heckle worked, but really any reporting would be helpful.
That's a great idea. The output right now is not the best part of Mutant :P
I'm keeping this open -- I will implement your proposed format :D (Unless of course you want to give it a try hehe)
If I get a chance, I'll put something together. I am really excited about this project - mutation testing is awesome!