As you can see, I’ve highlighted that every level of the tests is optional. That’s because it should be intentionally deliberated on which levels of tests will bring the most value in a given application. Writing tests is a cost, and bad tests are a waste. Duplicated coverage might seem like an extra protection, but it will be a burden during refactoring.
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The alternative, push-button solvers that return a binary pass or fail with no intermediate state, gives AI nothing to learn from and no way to guide the search. Worse, proofs that rely on heuristic solvers often break when the solver updates or when developers make small changes to how they write their specifications, even when the changes are logically equivalent. You cannot build a reliable AI pipeline on a foundation that is not reproducible. (I discuss this in detail in a recent Stanford talk.)