An unrelated reason for doing test strips exactly the same way as final prints : allegedly there's an
interval of time needed for the latent image to fully "set". If you just pull your sample from the enlarger and right into the dev, it might come out different. I've heard anything from 30 sec to 2 min
with Fuji papers before they should be developed. I've never tested for this myself; but then, I've
never processed a sample that soon anyway.