code: def test_adhoc_holidays(self):
      # hurricane sandy: oct 29 2012, oct 30 2012
      # national days of mourning:
      # - apr 27 1994
      # - june 11 2004
      # - jan 2 2007
      for day in [
          "1994-04-27",
          "2004-06-11",
          "2007-01-02",
          "2012-10-29",
          "2012-10-30",
      ]:
          self.assertFalse(
              self.calendar.is_session(pd.Timestamp(day, tz="UTC"))
          )
  
file_path: catalyst/tests/calendars/test_cfe_calendar.py
imports: from unittest import TestCase
  import pandas
  from .test_trading_calendar import ExchangeCalendarTestBase
  from catalyst.utils.calendars.exchange_calendar_cfe import CFEExchangeCalendar
label_desc: Use image node_id 3 for calling the CFECalendarTestCase obj's underlying member method code with example usage: obj.test_adhoc_holidays() without return types