code: def setUpClass(cls):
      cls.db_dir = suffix_pytest_xdist_worker_id_to_dir(
          EvaDB_DATABASE_DIR
      )
      cls.conn = connect(cls.db_dir)
      cls.evadb = cls.conn._evadb
  
file_path: evadb/test/integration_tests/long/test_saliency.py
imports: import unittest
  from test.util import shutdown_ray, suffix_pytest_xdist_worker_id_to_dir
  import pytest
  from evadb.configuration.constants import EvaDB_DATABASE_DIR, EvaDB_ROOT_DIR
  from evadb.interfaces.relational.db import connect
  from evadb.server.command_handler import execute_query_fetch_all
label_desc: Use image node_id 1 for calling the SaliencyTests obj's underlying member method code with example usage: obj.setUpClass(cls) without return types