code: def testCheckPipelineDslPathInvalid(self):
      flags_dict = {
          labels.ENGINE_FLAG: self.engine,
          labels.PIPELINE_DSL_PATH: "taxi_pipeline.py",
      }
      handler = FakeHandler(flags_dict)
      with self.assertRaises(SystemExit) as err:
          handler._check_pipeline_dsl_path()
      self.assertEqual(
          str(err.exception),
          "Invalid pipeline path: {}".format(
              flags_dict[labels.PIPELINE_DSL_PATH]
          ),
      )
  
imports: import os
  import textwrap
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.tools.cli import labels
  from tfx.tools.cli.handler import base_handler
label_desc: Use image node_id 3 for calling the BaseHandlerTest obj's underlying member method code with example usage: obj.testCheckPipelineDslPathInvalid() without return types