code: def test_unadjusted_get_value_no_data(self):
      table = self.bcolz_daily_bar_ctable
      reader = BcolzDailyBarReader(table)
      # before
      with self.assertRaises(NoDataBeforeDate):
          reader.get_value(
              2, Timestamp("2015-06-08", tz="UTC"), "close"
          )
  
      # after
      with self.assertRaises(NoDataAfterDate):
          reader.get_value(
              4, Timestamp("2015-06-16", tz="UTC"), "close"
          )
  
imports: from sys import maxsize
  import re
  from nose_parameterized import parameterized
  from numpy import arange, datetime64, nan
  from numpy.testing import assert_array_equal
  from pandas import DataFrame, Timestamp
  from pandas.util.testing import assert_index_equal
  from catalyst.data.us_equity_pricing import BcolzDailyBarReader, BcolzDailyBarWriter, NoDataBeforeDate, NoDataAfterDate
  from catalyst.pipeline.loaders.synthetic import OHLCV, asset_start, asset_end, expected_bar_value, expected_bar_values_2d, make_bar_data
  from catalyst.testing import seconds_to_timestamp
  from catalyst.testing.fixtures import WithAssetFinder, WithBcolzEquityDailyBarReader, WithTmpDir, WithTradingCalendars, CatalystTestCase
  from catalyst.utils.calendars import get_calendar
label_desc: Use image node_id 20 for calling the BcolzDailyBarTestCase obj's underlying member method code with example usage: obj.test_unadjusted_get_value_no_data() without return types