code: def test_get_packages_no_dir(self):
      # Test _get_packages() without a wheel package directory
      with unittest.mock.patch.object(
          ensurepip, "_PACKAGES", None
      ), unittest.mock.patch.object(ensurepip, "_WHEEL_PKG_DIR", None):
          packages = ensurepip._get_packages()
  
          # when bundled wheel packages are used, we get _PIP_VERSION
          self.assertEqual(ensurepip._PIP_VERSION, ensurepip.version())
  
      # use bundled wheel packages
      self.assertIsNotNone(packages["pip"].wheel_name)
  
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 3 for calling the TestPackages obj's underlying member method code with example usage: obj.test_get_packages_no_dir() without return types