[hammerdr]

Your functional test was a test that allowed you to experiment. You designed the parameters and then altered the variables involved under the conditions of those tests.

You probably even "called your shot" and make guesses about what would be successful before you even approached the problem.

Then you wrote a test and saw whether your guess was right or not. If not, then you misunderstood something and you dug deeper.

Software, in some ways, in simulated science.