Binary Coverage the Wrong Way

Jul 3, 2026 • Charlie Binary Coverage the Wrong Way The Right Way Way back in the age of the dinosaurs, if you wrote a program and wanted to test that it was correct, you mostly had two choices: you could either manually construct malformed inputs and try them in succession, or hook up a program which would randomly generate inputs and try them automatically 1. Those programs were called fuzzers, or sometimes generators, and this was “fuzz testing”. It also for quite a long time wasn’t very good: the generator would have no feedback from the program under test except “did this random input crash or not”.

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