code: def test_bts_on_first_minute(self):
      self.verify_bts_during_session(
          time(9, 30),
          [
              pd.Timestamp("2016-07-15 9:30", tz="US/Eastern"),
              pd.Timestamp("2016-07-18 9:30", tz="US/Eastern"),
              pd.Timestamp("2016-07-19 9:30", tz="US/Eastern"),
          ],
          1,
      )
  
file_path: catalyst/tests/test_clock.py
imports: from datetime import time
  from unittest import TestCase
  import pandas
  from catalyst.gens.sim_engine import MinuteSimulationClock, SESSION_START, BEFORE_TRADING_START_BAR, BAR, SESSION_END
  from catalyst.utils.calendars import get_calendar
  from catalyst.utils.calendars.trading_calendar import days_at_time
label_desc: Use image node_id 4 for calling the TestClock obj's underlying member method code with example usage: obj.test_bts_on_first_minute() without return types