Not quite; although, for example, a full test programme won't be conducted for wet runways (its hard to get exact runway states anyway, so there'd be some scatter in the data collected) - but the anti-skid system will at least be assessed in non-dry conditions, and any data gathered used in calculating the performance on wet runways.
(Even the dry data is "calculated", since the demonstrations are no longer done as one single performance landing, but in a piecewise fashion; a methodology encouraged after Douglas got a bit too enthusiastic during a landing test, the video of which is widely circulated...)