fast/forms/interactive-validation-* have been failing on the SnowLeopard WebKit2 bot since they were enabled in r82377. It looks like WebKitTestRunner is missing some support necessary for running these tests.
I added these tests to the mac-wk2 Skipped file in r82439.
<rdar://problem/9209324>
These tests run fine for me on Mountain Lion WK2 Debug. This was probably fixed in http://trac.webkit.org/changeset/128030 for https://bugs.webkit.org/show_bug.cgi?id=95936 *** This bug has been marked as a duplicate of bug 95936 ***