[tacticalogic]

Even determining the functionality requires testing the physical parameters.

So in this case functionality is not a valid test. It is superfluous.

The most basic fundamental of engineering is that form follows function. You've submitted that it performs a given function, and have implicitly specified the physical parameters it needs to conform to to fulfill that function. Testing one implicitly tests the other, you cannot separate them. It is disingenous sophistry.

[AndrewC]

You've submitted that it performs a given function,

I submitted that it was a rock that I hypothesized was an arrowhead. I did not hypothesize that it would perform any function, a blunt arrowhead will not make anything bleed to death, yet it is still an arrowhead. Have you no answer to my question about blood?