code: def test_register_calendar_type(self):
      register_calendar_type("DMY", self.dummy_cal_type)
      retr_cal = get_calendar("DMY")
      self.assertEqual(self.dummy_cal_type, type(retr_cal))
  
imports: from datetime import time
  from os.path import abspath, dirname, join
  from unittest import TestCase
  import numpy
  import pandas
  from nose_parameterized import parameterized
  from pandas import read_csv
  from pandas.tslib import Timedelta
  from pandas.util.testing import assert_index_equal
  from pytz import timezone
  from toolz import concat
  from catalyst.errors import CalendarNameCollision, InvalidCalendarName
  from catalyst.testing.predicates import assert_equal
  from catalyst.utils.calendars import deregister_calendar, get_calendar, register_calendar
  from catalyst.utils.calendars.calendar_utils import _default_calendar_aliases, _default_calendar_factories, register_calendar_type
  from catalyst.utils.calendars.trading_calendar import days_at_time, TradingCalendar
label_desc: Use image node_id 4 for calling the CalendarRegistrationTestCase obj's underlying member method code with example usage: obj.test_register_calendar_type() without return types