Random data doesn't need to make tests irreproducible. You emit the random seed at the start of the test. Then if you need to reproduce a failure you just pass

Random data doesn't need to make tests irreproducible. You emit the random seed at the start of the test. Then if you need to reproduce a failure you just pass the same seed as was emitted in the failing test case, while synced to the revision where the test failed. We do this all the time at work.