code: def test_load_raw_arrays(self):
      sessions = self.trading_calendar.sessions_in_range(
          self.START_DATE, self.END_DATE
      )
  
      results = self.dispatch_reader.load_raw_arrays(
          ["high", "volume"],
          sessions[0],
          sessions[2],
          [2, 10003, 1, 10001],
      )
  
      expected_per_sid = (
          (
              2,
              [array([200.9, nan, 202.9]), array([2000, 0, 2002])],
              "sid=2 should have values on the first and third sessions.",
          ),
          (
              10003,
              [array([nan, 30001.9, 30002.9]), array([0, 3001, 3002])],
              "sid=10003 should have values on the second and third sessions.",
          ),
          (
              1,
              [array([100.9, 101.90, nan]), array([1000, 1001, 0])],
              "sid=1 should have values on the first and second sessions.",
          ),
          (
              10001,
              [array([10000.9, 10001.9, nan]), array([1000, 1001, 0])],
              "sid=10001 should have a values on the first and second "
              "sessions.",
          ),
      )
  
      for i, (sid, expected, msg) in enumerate(expected_per_sid):
          for j, result in enumerate(results):
              assert_almost_equal(
                  result[:, i], expected[j], err_msg=msg
              )
  
imports: from numpy import array, nan
  from numpy.testing import assert_almost_equal
  from pandas import DataFrame, Timestamp
  from zipline.assets import Equity, Future
  from zipline.data.dispatch_bar_reader import AssetDispatchMinuteBarReader, AssetDispatchSessionBarReader
  from zipline.data.resample import MinuteResampleSessionBarReader, ReindexMinuteBarReader, ReindexSessionBarReader
  from zipline.testing.fixtures import WithBcolzEquityMinuteBarReader, WithBcolzEquityDailyBarReader, WithBcolzFutureMinuteBarReader, WithTradingSessions, ZiplineTestCase
label_desc: Use image node_id 5 for calling the AssetDispatchSessionBarTestCase obj's underlying member method code with example usage: obj.test_load_raw_arrays() without return types