Java tool to modify test code

Question

I recently read a French blog post about some kind of Java tool that modifies unit test code (like inverting conditions, etc.) to verify that tests fail quickly.

My problem is that I just can't remember the name right now. Does anyone know this?

Answer 1

It may be the Jumble you are thinking of.

Answer 2

Jester also matches the description — other than that (just like Jumble), it modifies the test code, not the test code.