I think there's another difference between the two that isn't there by definition but manifests in practice: If we were to imagine a simplified landscape in wh

I think there's another difference between the two that isn't there by definition but manifests in practice: If we were to imagine a simplified landscape in which all tests fall on a one-dimensional axis, from "quick unit tests" on the left to "slow integration tests" on the right , fuzzing is even further off to the right. Fuzzing is often very slow and operates on an entire black-box program, trying to understand and break it. Access to source code isn't always needed. My understanding may be incomplete; please correct me if I missed something.