code: def test_get_empty_splits(self):
      splits = self.data_portal.get_splits([], self.trading_days[2])
      self.assertEqual([], splits)
  
imports: from collections import OrderedDict
  from numpy import array, append, nan, full
  from numpy.testing import assert_almost_equal
  import pandas
  from pandas import Timedelta
  from six import iteritems
  from zipline.assets import Equity, Future
  from zipline.data.data_portal import HISTORY_FREQUENCIES, OHLCV_FIELDS
  from zipline.data.minute_bars import FUTURES_MINUTES_PER_DAY, US_EQUITIES_MINUTES_PER_DAY
  from zipline.testing import parameter_space
  from zipline.testing.fixtures import ZiplineTestCase, WithTradingSessions, WithDataPortal, alias
  from zipline.testing.predicates import assert_equal
  from zipline.utils.numpy_utils import float64_dtype
label_desc: Use image node_id 15 for calling the DataPortalTestBase obj's underlying member method code with example usage: obj.test_get_empty_splits() without return types