There was a CNC Race test file used for some drag racing:
I think it depends on what you want to test. If you have a specific component of a cut you want to test, like the fastest slot cut, then that’s probably fine. But a real cut would have degradation in precision and you’d care about a finishing pass as well (if you wanted the precision back).
But in the end. A test is only as good as the interpretation of the results. They all have merit.