The proof of the pudding is in the eating
The old aphorisms generally ring true, and paraphrased for razor honing this one might go
'The proof of the edge is in the shave'.
The tests are indicators that you're probably on the right road, signposts; but if you've already arrived at the destination then there's not much point to worrying over whether or not you missed one or more of those signs along the way.
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