code: def testPipelineMissingFlag(self):
      result = self.runner.invoke(pipeline_group, ["update"])
      self.assertNotEqual(0, result.exit_code)
  
imports: import codecs
  import locale
  import os
  from unittest import mock
  from click import testing
  import tensorflow
  from tfx.tools.cli.commands.pipeline import pipeline_group
  from tfx.tools.cli.handler import handler_factory
  from tfx.utils import test_case_utils
label_desc: Use image node_id 9 for calling the PipelineTest obj's underlying member method code with example usage: obj.testPipelineMissingFlag() without return types