A large part of the W3C test suite, stripped of all its text elements is now available as rendering tests in SVN. It does not include anything that relies solely on text, animation or scripting (at least I've tried to make sure it doesn't).

Compared to the latest test suite compliance results on the Wiki there either have been quite a few regressions or I've been more strict. In any case, there are plenty of failure cases (63 out of 151).

See http://wiki.inkscape.org/wiki/index.php/TestingInkscape for information on running the tests.