code: def test_skip_minutes_multiple(self, field):
      # Test skipping minutes, to exercise backfills.
      # Tests initial backfill and mid day backfill.
      method_name = field + "s"
      assets = self.asset_finder.retrieve_all([1, 2])
      minutes = EQUITY_CASES[1].index
      for i in [1, 5]:
          minute = minutes[i]
          values = getattr(self.equity_daily_aggregator, method_name)(
              assets, minute
          )
          for j, asset in enumerate(assets):
              value = values[j]
              # Prevent regression on building an array when scalar is
              # intended.
              self.assertIsInstance(value, Real)
              assert_almost_equal(
                  value,
                  EXPECTED_AGGREGATION[asset][field][i],
                  err_msg="sid={0} field={1} dt={2}".format(
                      asset, field, minute
                  ),
              )
  
          # Call a second time with the same dt, to prevent regression
          # against case where crossed start and end dts caused a crash
          # instead of the last value.
          values = getattr(self.equity_daily_aggregator, method_name)(
              assets, minute
          )
          for j, asset in enumerate(assets):
              value = values[j]
              # Prevent regression on building an array when scalar is
              # intended.
              self.assertIsInstance(value, Real)
              assert_almost_equal(
                  value,
                  EXPECTED_AGGREGATION[asset][field][i],
                  err_msg="sid={0} field={1} dt={2}".format(
                      asset, field, minute
                  ),
              )
  
imports: from collections import OrderedDict
  from numbers import Real
  from nose_parameterized import parameterized
  from numpy.testing import assert_almost_equal
  from numpy import nan, array, full, isnan
  import pandas
  from pandas import DataFrame
  from six import iteritems
  from zipline.data.resample import minute_frame_to_session_frame, DailyHistoryAggregator, MinuteResampleSessionBarReader, ReindexMinuteBarReader, ReindexSessionBarReader
  from zipline.testing import parameter_space
  from zipline.testing.fixtures import WithEquityMinuteBarData, WithBcolzEquityMinuteBarReader, WithBcolzEquityDailyBarReader, WithBcolzFutureMinuteBarReader, ZiplineTestCase
label_desc: Use image node_id 11 for calling the MinuteToDailyAggregationTestCase obj's underlying member method code with example usage: obj.test_skip_minutes_multiple(field) without return types