def test_check_sanity(self):
t = PrefTree()
t['abc'] = PrefTree()
t['aa'] = PrefTree()
self.assertFalse(t.check_sanity())
t = PrefTree(url_count=-1)
self.assertFalse(t.check_sanity())
t = PrefTree()
t['abc'] = PrefTree()
t.is_wildcard = True
self.assertFalse(t.check_sanity())
t2 = PrefTree()
t2['def'] = t
self.assertFalse(t2.check_sanity())
