code: def test_columns_count_property(self):
      # Test columns_count property
      self.connector._columns_count = None
      mock_df = Mock()
      mock_df.columns = ["Column1", "Column2"]
      self.connector.head = Mock(return_value=mock_df)
      columns_count = self.connector.columns_count
      self.assertEqual(columns_count, 2)
  
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 7 for calling the TestSQLConnector obj's underlying member method code with example usage: obj.test_columns_count_property() without return types