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One thing that comes to mind: You still have to verify that the tests are exhaustive, and that the code isn't just gaming specific test scenarios.

I guess fuzzing and property-based testing could mitigate this to some extent.

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Yes, we are getting there. I think compiler is a bigger problem than unit tests given most verticals don't even have that. With unit tests, there would be some reward hacking but would be controlled at the model level + tests. (this is one of the reason i dont believe in transformer based llm as a judge for a verifier)

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