code: def testCompilePipeline(self):
      flags_dict = {
          labels.ENGINE_FLAG: self.engine,
          labels.PIPELINE_DSL_PATH: self.pipeline_path,
      }
      handler = airflow_handler.AirflowHandler(flags_dict)
      with self.captureWritesToStream(sys.stdout) as captured:
          handler.compile_pipeline()
      self.assertIn(
          "Pipeline compiled successfully", captured.contents()
      )
  
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 11 for calling the AirflowHandlerTest obj's underlying member method code with example usage: obj.testCompilePipeline() without return types