'Parsing a single mode setting with no parameters results in that mode,
with no parameters, in the "added" direction and no modes in the
"removed" direction.'

def test_singleMode(self):

    (added, removed) = irc.parseModes('+s', [])
    self.assertEqual(added, [('s', None)])
    self.assertEqual(removed, [])
    (added, removed) = irc.parseModes('-s', [])
    self.assertEqual(added, [])
    self.assertEqual(removed, [('s', None)])
