def testReadLen_single_byte(self):
s = BytesIO(b'\x01\x02')
ret = read_next_len(s)
self.assertEqual(1, ret)
s = BytesIO(b'\xFD')
ret = read_next_len(s)
self.assertEqual(253, ret)
def testReadLen_255(self):
s = BytesIO(b'\xFF\x00')
ret = read_next_len(s)
self.assertIsNone(ret)
def testReadLen_254(self):
s = BytesIO(b'\xFE\x02\x00\x00\x00')
ret = read_next_len(s)
self.assertEqual(2, ret)
