code: def testDeletePipelineNonExistentPipeline(self):
      flags_dict = {
          labels.ENGINE_FLAG: self.engine,
          labels.PIPELINE_NAME: self.pipeline_name,
      }
      handler = beam_handler.BeamHandler(flags_dict)
      with self.assertRaises(SystemExit) as err:
          handler.delete_pipeline()
      self.assertEqual(
          str(err.exception),
          'Pipeline "{}" does not exist.'.format(
              flags_dict[labels.PIPELINE_NAME]
          ),
      )
  
imports: import json
  import os
  import subprocess
  import sys
  from unittest import mock
  import tensorflow
  from tfx.dsl.components.base import base_driver
  from tfx.dsl.io import fileio
  from tfx.tools.cli import labels
  from tfx.tools.cli.handler import beam_handler
  from tfx.utils import test_case_utils
label_desc: Use image node_id 10 for calling the BeamHandlerTest obj's underlying member method code with example usage: obj.testDeletePipelineNonExistentPipeline() without return types