code: def test_connect(self, handler):
      handler.connect()
      assert handler.is_connected, "connection error"
  
file_path: mindsdb/tests/handler_tests/test_apache_doris_handler.py
imports: import pytest
  from mindsdb.integrations.handlers.apache_doris_handler.apache_doris_handler import ApacheDorisHandler
  from mindsdb.api.executor.data_types.response_type import RESPONSE_TYPE
label_desc: Use image node_id 3 for calling the TestMySQLHandler obj's underlying member method code with example usage: obj.test_connect(handler) without return types