That's rather odd. Sounds like the tests in url.t passed, but the test author did not indicate how many tests he was running. I'd open up url.t and see if that's the case. If so, I'd tentatively try the module out as the tests themselves are passing.
Actually, after a quick bit of research I find this:
Sounds like just a mistake in the test plan. I don't think I'd be too concerned as long as no tests are shown to be failing. Course, take my advice with a grain of salt as I'm definitely not an expert :)