code: def test_execute_direct_sql_query_malicious_query(self):
      malicious_query = "DROP TABLE users"
      try:
          self.connector.execute_direct_sql_query(malicious_query)
          assert False, "MaliciousQueryError not raised"
      except MaliciousQueryError:
          pass
  
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 13 for calling the TestSQLConnector obj's underlying member method code with example usage: obj.test_execute_direct_sql_query_malicious_query() without return types