code: def test_pip_config_file_disabled(self):
      # ensurepip deliberately ignores the pip config file
      # See http://bugs.python.org/issue20053 for details
      with fake_pip():
          ensurepip._uninstall_helper()
      self.assertEqual(self.os_environ["PIP_CONFIG_FILE"], os.devnull)
  
imports: import contextlib
  import os
  import os.path
  import sys
  import tempfile
  import test.support
  import unittest
  import unittest.mock
  import ensurepip
  import ensurepip._uninstall
label_desc: Use image node_id 8 for calling the TestUninstall obj's underlying member method code with example usage: obj.test_pip_config_file_disabled() without return types