code: def test_str_decode(self):
      for enc in ALL_CJKENCODINGS:
          self.assertEqual("abcd".encode(enc), b"abcd")
  
imports: import _multibytecodec
  import codecs
  import io
  import sys
  import textwrap
  import unittest
  from test import support
  from test.support import os_helper
  from test.support.os_helper import TESTFN
label_desc: Use image node_id 2 for calling the Test_MultibyteCodec obj's underlying member method code with example usage: obj.test_str_decode() without return types