docstr: Confirm that we can set the attributes of a sid's file correctly.
          
docstr_tok: ["Confirm","that","we","can","set","the","attributes","of","a","sid","'s","file","correctly","."]
code: def test_set_sid_attrs(self):
      """Confirm that we can set the attributes of a sid's file correctly."""
  
      sid = 1
      start_day = Timestamp("2015-11-27", tz="UTC")
      end_day = Timestamp("2015-06-02", tz="UTC")
      attrs = {
          "start_day": start_day.value / int(1e9),
          "end_day": end_day.value / int(1e9),
          "factor": 100,
      }
  
      # Write the attributes
      self.writer.set_sid_attrs(sid, **attrs)
      # Read the attributes
      for k, v in attrs.items():
          self.assertEqual(self.reader.get_sid_attr(sid, k), v)
  
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 catalyst.data.minute_bars import BcolzMinuteBarMetadata, BcolzMinuteOverlappingData, US_EQUITIES_MINUTES_PER_DAY, BcolzMinuteWriterColumnMismatch, H5MinuteBarUpdateWriter, H5MinuteBarUpdateReader
  from catalyst.exchange.exchange_bcolz import BcolzExchangeBarWriter, BcolzExchangeBarReader
  from catalyst.testing.fixtures import WithAssetFinder, WithInstanceTmpDir, WithTradingCalendars, CatalystTestCase
label_desc: Use image node_id 21 for calling the BcolzMinuteBarTestCase obj's underlying member method code with example usage: obj.test_set_sid_attrs() without return types