code: def test_get_datatype_presto(self):
      self.assertEqual(
          "STRING", PrestoEngineSpec.get_datatype("string")
      )
  
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 1 for calling the TestPrestoDbEngineSpec obj's underlying member method code with example usage: obj.test_get_datatype_presto() without return types