[lunar_mycroft]

Two possibilities:

1. Your unit tests are exacting enough to fully specify the unit. In that case, congratulations, your unit tests are the code. They're also probably much more awkward to write, maintain, etc. Also, the compilation step to go from the unit tests to the actual code is now orders of magnitude more expensive, requires a SaaS to even work, etc.

2. Your unit tests are not that exacting and still leave ambiguity, edge cases, etc. In that case it very much matters what's in the blob of code, because while it could be a correct implementation of what you wanted, it could also be something else entirely that just happens to be correct for the part you did specify.