code: def test_mapping_file(self):
      if self.mapfileurl.endswith(".xml"):
          self._test_mapping_file_ucm()
      else:
          self._test_mapping_file_plain()
  
imports: import codecs
  import os
  import re
  import sys
  import unittest
  from http.client import HTTPException
  from test import support
  from io import BytesIO
label_desc: Use image node_id 3 for calling the TestBase_Mapping obj's underlying member method code with example usage: obj.test_mapping_file() without return types