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I'm just learning how to whetstone sharpen. I'm wondering if there are different tests I can do to verify I successfully sharpened at a particular grit?

For example:
400 Grit should ?
1000 Grit should slide cut through paper but not push cut?
4000 Grit should push cut through rolled up glossy magazine page?
Leather strop should make a horizontal slice through a tomato without anything holding it down?

I'm trying to sharpen an old knife and at 400 grit it doesn't do anything to paper and I have no idea to keep going or move up to 1000