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Property-based testing is nice, but making it coverage-driven is a game changer. It will explore code paths that naive random inputs will not trigger in a thousand years. In Rust this works very well with libFuzzer and the Arbitrary crate to derive the generators.

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[Disclaimer: Started Antithesis]

If you run your Hegel tests in Antithesis, you get this for free (along with various sorts of “non-local” assertions, perfect reproducibility even for concurrent or distributed code, etc.).

But yeah, not hard to hack together basic coverage guidance outside Antithesis. That works well for large classes of programs, just not a majority of them.

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