code: def test_cesu8():
      cls1 = bad_codecs.search_function("cesu8").__class__
      cls2 = bad_codecs.search_function("cesu-8").__class__
      assert cls1 == cls2
  
      test_bytes = (
          b"\xed\xa6\x9d\xed\xbd\xb7 is an unassigned character, "
          b"and \xc0\x80 is null"
      )
      test_text = (
          "\U00077777 is an unassigned character, and \x00 is null"
      )
      assert test_bytes.decode("cesu8") == test_text
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_cesu8() without return types