We've had a test suite for six or so years now, and we keep getting closer to having it pass reliably, but we're still not quite there. I see from http://test.winehq.org that fifteen tests fail on at least one machine.
There are several bugs that only cause make test to fail if you run them with WINEDEBUG=warn+heap, but those seem just as important to me.
On my own machine, here are the bugs related to make test failures: http://bugs.winehq.org/show_bug.cgi?id=12925 http://bugs.winehq.org/show_bug.cgi?id=14078 http://bugs.winehq.org/show_bug.cgi?id=17414 http://bugs.winehq.org/show_bug.cgi?id=17518 http://bugs.winehq.org/show_bug.cgi?id=19183
I submitted a patch to fix http://bugs.winehq.org/show_bug.cgi?id=17518 but it'd be nice to get some love on the others. - Dan