Proving program correctness is not easy. For example, one must prove the correctness of the entire dependency supply chain that the target program might directly or indirectly call. Sure, the proofs of those dependencies are to a degree reusable, but would likely need to be re-proved for each distinct set of parameters.
And on the other hand, TDD shows that having expectations of the results before coding the procedure is a good thing. Not necessarily proving the implementation correct but TDD is more likely to produce correct code.
And on the other hand, TDD shows that having expectations of the results before coding the procedure is a good thing. Not necessarily proving the implementation correct but TDD is more likely to produce correct code.