code: def test_presto_extra_table_metadata(self):
      db = mock.Mock()
      db.get_indexes = mock.Mock(
          return_value=[{"column_names": ["ds", "hour"]}]
      )
      db.get_extra = mock.Mock(return_value={})
      df = pd.DataFrame({"ds": ["01-01-19"], "hour": [1]})
      db.get_df = mock.Mock(return_value=df)
      PrestoEngineSpec.get_create_view = mock.Mock(return_value=None)
      result = PrestoEngineSpec.extra_table_metadata(
          db, "test_table", "test_schema"
      )
      assert result["partitions"]["cols"] == ["ds", "hour"]
      assert result["partitions"]["latest"] == {
          "ds": "01-01-19",
          "hour": 1,
      }
  
imports: from collections import namedtuple
  from textwrap import dedent
  from unittest import mock, skipUnless
  import pandas
  from flask.ctx import AppContext
  from sqlalchemy import types
  from sqlalchemy.sql import select
  from superset.db_engine_specs.presto import PrestoEngineSpec
  from superset.errors import ErrorLevel, SupersetError, SupersetErrorType
  from superset.sql_parse import ParsedQuery
  from superset.utils.database import get_example_database
  from tests.integration_tests.db_engine_specs.base_tests import TestDbEngineSpec
label_desc: Use image node_id 17 for calling the TestPrestoDbEngineSpec obj's underlying member method code with example usage: obj.test_presto_extra_table_metadata() without return types