code: def test_version(self):
      # Test version()
      with tempfile.TemporaryDirectory() as tmpdir:
          self.touch(tmpdir, "pip-1.2.3b1-py2.py3-none-any.whl")
          with unittest.mock.patch.object(
              ensurepip, "_PACKAGES", None
          ), unittest.mock.patch.object(
              ensurepip, "_WHEEL_PKG_DIR", tmpdir
          ):
              self.assertEqual(ensurepip.version(), "1.2.3b1")
  
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 2 for calling the TestPackages obj's underlying member method code with example usage: obj.test_version() without return types