> I'm hardly putting words in your mouth. You were expressing more-or-less exactly this sentiment in your previous post.

Trust me, I wasn’t.

> It follows by definition of output-based or blackbox evaluation. Evaluating the output of a system implies that you are evaluating inputs in proportion to their contribution to the output.

I like this! It’s like pure functions/total programming, only not rigorously defined in the slightest.

It’s not an answer to my question though, HOW do you know that the results of your output/blackbox testing is correct?