code: def test_aes256_cbc_bytes(self):
      enc_bytes = encrypt_bytes_with_AES_CBC(
          self.random_str.encode("utf-8"),
          "analytics-zoo",
          "intel-analytics",
          256,
      )
      dec_bytes = decrypt_bytes_with_AES_CBC(
          enc_bytes, "analytics-zoo", "intel-analytics", 256
      )
      assert dec_bytes == self.random_str.encode(
          "utf-8"
      ), "Check AES CBC 256 encryption and decryption result"
  
file_path: analytics-zoo/pyzoo/test/zoo/common/test_encryption_utils.py
imports: from unittest import TestCase
  import pytest
  import string
  import random
  from zoo.common.encryption_utils import *
label_desc: Use image node_id 3 for calling the TestEncryption obj's underlying member method code with example usage: obj.test_aes256_cbc_bytes() without return types