code: def setUpClass(cls):
      connection_data = {
          "project_id": "tough-future-332513",
          "service_account_keys": "/home/bigq/tough-future-332513-6699d9b39601.json",
      }
      cls.handler = BigQueryHandler(
          "test_bigquery_handler", connection_data
      )
  
file_path: mindsdb/mindsdb/integrations/handlers/bigquery_handler/tests/test_bigquery_handler.py
imports: import unittest
  from mindsdb.integrations.handlers.bigquery_handler.bigquery_handler import BigQueryHandler
  from mindsdb.integrations.libs.response import RESPONSE_TYPE
label_desc: Use image node_id 1 for calling the BigQueryHandlerTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types