code: def testPipelineCreate(self):
      # Create a pipeline.
      self._valid_create_and_check(
          self._pipeline_path, self._pipeline_name
      )
  
      # Test pipeline create when pipeline already exists.
      result = self.runner.invoke(
          cli_group,
          [
              "pipeline",
              "create",
              "--engine",
              "airflow",
              "--pipeline_path",
              self._pipeline_path,
          ],
      )
      self.assertIn("Creating pipeline", result.output)
      self.assertTrue(
          'Pipeline "{}" already exists.'.format(self._pipeline_name),
          result.output,
      )
  
imports: import codecs
  import locale
  import os
  import subprocess
  import sys
  import time
  import absl
  from click import testing
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.orchestration.airflow import test_utils
  from tfx.tools.cli import labels
  from tfx.tools.cli import pip_utils
  from tfx.tools.cli.cli_main import cli_group
  from tfx.tools.cli.e2e import test_utils
  from tfx.utils import io_utils
  from tfx.utils import retry
  from tfx.utils import test_case_utils
label_desc: Use image node_id 9 for calling the CliAirflowEndToEndTest obj's underlying member method code with example usage: obj.testPipelineCreate() without return types