code: def testDeletePipeline(self):
      # First create a pipeline.
      flags_dict = {
          labels.ENGINE_FLAG: self.engine,
          labels.PIPELINE_DSL_PATH: self.pipeline_path,
      }
      handler = airflow_handler.AirflowHandler(flags_dict)
      handler.create_pipeline()
  
      # Now delete the pipeline created aand check if pipeline folder is deleted.
      flags_dict = {
          labels.ENGINE_FLAG: self.engine,
          labels.PIPELINE_NAME: self.pipeline_name,
      }
      handler = airflow_handler.AirflowHandler(flags_dict)
      handler.delete_pipeline()
      handler_pipeline_path = os.path.join(
          handler._handler_home_dir,
          self.pipeline_args[labels.PIPELINE_NAME],
          "",
      )
      self.assertFalse(fileio.exists(handler_pipeline_path))
  
imports: import json
  import os
  import subprocess
  import sys
  from unittest import mock
  import click
  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 airflow_handler
  from tfx.utils import io_utils
  from tfx.utils import test_case_utils
label_desc: Use image node_id 7 for calling the AirflowHandlerTest obj's underlying member method code with example usage: obj.testDeletePipeline() without return types