code: def test_14_get_columns(self):
      columns = self.handler.catalog_search_data.get_columns()
  
      expected_columns = [
          "title",
          "type",
          "source",
          "year",
          "pmid",
          "sgr",
          "issn",
          "scopus",
          "doi",
          "pui",
          "authors",
          "keywords",
          "link",
          "id",
      ]
  
      self.assertListEqual(columns, expected_columns)
  
imports: import unittest
  from mindsdb.integrations.handlers.mendeley_handler.mendeley_handler import MendeleyHandler
  from mindsdb.api.executor.data_types.response_type import RESPONSE_TYPE
label_desc: Use image node_id 16 for calling the MendeleyHandlerTest obj's underlying member method code with example usage: obj.test_14_get_columns() without return types