code: def test_get_full_name_empty_tuple(self):
      names = [
          ("part1", "part2"),
          ("", "part3"),
          ("part4", "part5"),
          ("", "part6"),
      ]
      result = PrestoEngineSpec._get_full_name(names)
      assert result == "part1.part4"
  
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 23 for calling the TestPrestoDbEngineSpec obj's underlying member method code with example usage: obj.test_get_full_name_empty_tuple() without return types