code: def test_decode_unicode(self):
      # Trying to decode a unicode string should raise a TypeError
      for enc in ALL_CJKENCODINGS:
          decoder = codecs.getincrementaldecoder(enc)()
          self.assertRaises(TypeError, decoder.decode, "")
  
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 4 for calling the Test_IncrementalDecoder obj's underlying member method code with example usage: obj.test_decode_unicode() without return types