code: def setUpClass(cls):
      cls.backend = pipeline_dp.LocalBackend()
  
imports: import sys
  import unittest
  from dataclasses import dataclass
  from typing import List
  import apache_beam
  import apache_beam.testing.test_pipeline
  import apache_beam.testing.util
  from absl.testing import parameterized
  import pipeline_dp
  from pipeline_dp import pipeline_functions
  from pipeline_dp import pipeline_backend
label_desc: Use image node_id 1 for calling the LocalBackendTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types