code: def _patchVersion(self, ver):
      old_version = version.__version__
      old_base_image = labels.BASE_IMAGE
      version.__version__ = ver
      labels.BASE_IMAGE = "tensorflow/tfx:%s" % ver
      yield
      labels.BASE_IMAGE = old_base_image
      version.__version__ = old_version
  
file_path: tfx/tfx/tools/cli/container_builder/dockerfile_test.py
imports: import contextlib
  import filecmp
  import os
  import tensorflow
  from tfx import version
  from tfx.tools.cli.container_builder import dockerfile
  from tfx.tools.cli.container_builder import labels
  from tfx.utils import test_case_utils
label_desc: Use image node_id 2 for calling the DockerfileTest obj's underlying member method code with example usage: obj._patchVersion(ver) without return types