def METHOD_NAME(self):
    self.assertIsNone(mapto_v6('foo'))
    self.assertIsNone(mapto_v6('192.'))
    self.assertEqual(mapto_v6('192.168.1.1'), '::ffff:192.168.1.1')
    self.assertEqual(mapto_v6('::1'), '::1')
    self.assertEqual(mapto_v6('ff00::'), 'ff00::')