If you mean randomized tests as in adding random choices to your tests, I think that is a very bad idea (that I have been bitten by before).
You NEED tests to behave consistently. If you run the tests twice against the same code, it needs to return the same result. Otherwise, how will you know you have fixed the issue the tests caught?
Speaking from experience, soon after you introduce randomness to tests, you will start to get intermittent test failures. When that happens, people will start to ignore failing tests because, 'hey, this is probably just a random failure'
You NEED tests to behave consistently. If you run the tests twice against the same code, it needs to return the same result. Otherwise, how will you know you have fixed the issue the tests caught?
Speaking from experience, soon after you introduce randomness to tests, you will start to get intermittent test failures. When that happens, people will start to ignore failing tests because, 'hey, this is probably just a random failure'