2009/2/11 Alexandre Julliard <julliard@winehq.org>

That's not a useful number, many files run a lot of tests, of which a
huge majority always succeeds. Having a single failure among 10,000
tests means that the test failed, and it's something bad that should be
taken care of. Showing that as a 99.99% success would be very misleading.

 
i think what he means is a value for the whole run, not for each file... this way we get the number of failing files and failing tests for one run. i think that could be useful, at least it can show much more difference and give a better response to fixing tests than a file failure statistic.
it would be a more changing rate.