I've got some tests failing here on a vanilla master check out.
[junit] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.314 sec
[junit] Test org.apache.nutch.net.TestURLNormalizers FAILED
Jurian had protocol-http's test failing just now, but running ant test on my system with a clean check out didn't run the plugin tests at all. Whatever i do, plugin tests won't run.