[postalrat]

Would that be more desirable than building your tests from your application?

Seems to me that once you can go either way then you just proved the other redundant.

[h0l0cube]

The central thesis of this diatribe is that in order to have a 'complete' unit^ test, you need something at least as complicated as the original code:

https://rbcs-us.com/documents/Why-Most-Unit-Testing-is-Waste...

^ where the 'unit' is basically a function. i.e., to test a function fully, write a test as complicated as the function