code: def setUp(self):
      try:
          self.open_mapping_file().close()  # test it to report the error early
      except (OSError, HTTPException):
          self.skipTest("Could not retrieve " + self.mapfileurl)
  
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 1 for calling the TestBase_Mapping obj's underlying member method code with example usage: obj.setUp() without return types