There is mention of Property Based Testing and minimization. That's a very nice technique. The fuzzer may generate various data shapes and types, but then once

There is mention of Property Based Testing and minimization. That's a very nice technique. The fuzzer may generate various data shapes and types, but then once a failure happens the generated types know how to shrink/minimize to produce the smallest failing test case to present to the user. The author mentions correctly that for composite generated types, the shrinking behavior can compose too. So, a list of integers might shrink both integer values, to a lower bound, and the list size to have one less element, so you wouldn't need to implement a custom list of integers shrinking behavior. You can just compose the fuzzing generators. There is an excellent book by Fred Herbert about property testing. It's Erlang based but the general concept applies to other frameworks: https://propertesting.com/book_shrinking.html https://propertesting.com/book_shrinking.html