code: def testCreatePipeline(self):
      flags_dict = {
          labels.ENGINE_FLAG: self.engine,
          labels.PIPELINE_DSL_PATH: self.pipeline_path,
      }
      handler = airflow_handler.AirflowHandler(flags_dict)
      handler.create_pipeline()
      handler_pipeline_path = handler._get_pipeline_info_path(
          self.pipeline_name
      )
      self.assertTrue(
          fileio.exists(
              os.path.join(
                  handler_pipeline_path, "test_pipeline_airflow_1.py"
              )
          )
      )
  
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 3 for calling the AirflowHandlerTest obj's underlying member method code with example usage: obj.testCreatePipeline() without return types