code: def test_constructor_and_properties(
      self, mock_load_connector_config, mock_init_connection
  ):
      # Test constructor and properties
  
      self.assertEqual(self.connector._config, self.config)
      self.assertEqual(self.connector._engine, self.mock_engine)
      self.assertEqual(self.connector._connection, self.mock_connection)
      self.assertEqual(self.connector._cache_interval, 600)
      SQLConnector(self.config)
      mock_load_connector_config.assert_called()
      mock_init_connection.assert_called()
  
imports: import unittest
  import pandas
  from unittest.mock import Mock, patch
  from pandasai.connectors.base import SQLConnectorConfig
  from pandasai.connectors.sql import PostgreSQLConnector, SQLConnector
  from pandasai.exceptions import MaliciousQueryError
label_desc: Use image node_id 2 for calling the TestSQLConnector obj's underlying member method code with example usage: obj.test_constructor_and_properties(mock_load_connector_config, mock_init_connection) without return types