code: def test_AfterOpen(self):
      minute_groups = minutes_for_days(self.cal, ordered_days=True)
      should_trigger = self.after_open.should_trigger
      for session_minutes in minute_groups:
          for i, minute in enumerate(session_minutes):
              # Should only trigger at the 64th minute
              if i != 64:
                  self.assertFalse(should_trigger(minute))
              else:
                  self.assertTrue(should_trigger(minute))
  
imports: import datetime
  from inspect import isabstract
  import random
  from unittest import TestCase
  import warnings
  from nose_parameterized import parameterized
  import pandas
  from six import iteritems
  from six.moves import range, map
  import catalyst.utils.events
  from catalyst.utils.calendars import get_calendar
  from catalyst.utils.events import EventRule, StatelessRule, Always, Never, AfterOpen, ComposedRule, BeforeClose, NotHalfDay, NthTradingDayOfWeek, NDaysBeforeLastTradingDayOfWeek, NthTradingDayOfMonth, NDaysBeforeLastTradingDayOfMonth, StatefulRule, OncePerDay, _build_offset, _build_date, _build_time, EventManager, Event, MAX_MONTH_RANGE, MAX_WEEK_RANGE, TradingDayOfMonthRule, TradingDayOfWeekRule
label_desc: Use image node_id 4 for calling the StatelessRulesTests obj's underlying member method code with example usage: obj.test_AfterOpen() without return types