code: def setUp(self):
      super().setUp()
      self.engine = "airflow"
      self.chicago_taxi_pipeline_dir = os.path.join(
          os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
          "testdata",
      )
      self.pipeline_path = os.path.join(
          self.chicago_taxi_pipeline_dir, "test_pipeline_airflow_1.py"
      )
      self._original_home = os.environ["HOME"]
      os.environ["HOME"] = self.create_tempdir().full_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 1 for calling the BaseHandlerTest obj's underlying member method code with example usage: obj.setUp() without return types