def test_get_root_on_create(self):
        root_on_create_val = Instance.get_root_on_create(
            'redis')
        self.assertFalse(root_on_create_val)
def _getN(self, n):
        n -= 1
        p = self.head
        while n:
            p = p.next
            n -= 1
        return p