code: def init_instance_fixtures(self):
      super(BcolzMinuteBarTestCase, self).init_instance_fixtures()
  
      self.dest = self.instance_tmpdir.getpath("minute_bars")
      os.makedirs(self.dest)
      self.writer = BcolzMinuteBarWriter(
          self.dest,
          self.trading_calendar,
          TEST_CALENDAR_START,
          TEST_CALENDAR_STOP,
          US_EQUITIES_MINUTES_PER_DAY,
      )
      self.reader = BcolzMinuteBarReader(self.dest)
  
imports: from datetime import timedelta
  import os
  from numpy import arange, array, int64, float64, full, nan, transpose, zeros
  from numpy.testing import assert_almost_equal, assert_array_equal
  from pandas import DataFrame, DatetimeIndex, Timestamp, Timedelta, NaT, date_range
  from zipline.data.bar_reader import NoDataForSid, NoDataOnDate
  from zipline.data.minute_bars import BcolzMinuteBarMetadata, BcolzMinuteBarWriter, BcolzMinuteBarReader, BcolzMinuteOverlappingData, US_EQUITIES_MINUTES_PER_DAY, BcolzMinuteWriterColumnMismatch, H5MinuteBarUpdateWriter, H5MinuteBarUpdateReader
  from zipline.testing.fixtures import WithAssetFinder, WithInstanceTmpDir, WithTradingCalendars, ZiplineTestCase
label_desc: Use image node_id 2 for calling the BcolzMinuteBarTestCase obj's underlying member method code with example usage: obj.init_instance_fixtures() without return types