Seconded. I've used it for testing various functions in recommendation systems, and it's great at finding boundary conditions you didn't think of, or issues wit

Seconded. I've used it for testing various functions in recommendation systems, and it's great at finding boundary conditions you didn't think of, or issues with floating point math. And, as it was the first time I used any testing tools like this, it was a fun emotional experience to have an antagonistic test suite.