code: def _MockSubprocessKubeflow(self):
      return b"absl-py==0.7.1\nadal==1.2.1\nalembic==0.9.10\napache-beam==2.12.0\nkfp==0.1\n"
  
imports: import os
  import sys
  import tempfile
  from unittest import mock
  import tensorflow
  from tfx.tools.cli import labels
  from tfx.tools.cli.handler import beam_handler
  from tfx.tools.cli.handler import handler_factory
  from tfx.tools.cli.handler import local_handler
label_desc: Use image node_id 4 for calling the HandlerFactoryTest obj's underlying member method code with example usage: obj._MockSubprocessKubeflow() and returns: bytes