code: def check_header(self, msg):
      pass
  
imports: import copy
  import json
  from unittest import TestCase
  from jupyter_client.adapter import V4toV5, adapt, code_to_line
  from jupyter_client.session import Session
label_desc: Use image node_id 3 for calling the AdapterTest obj's underlying member method code with example usage: obj.check_header(msg) without return types