code: def init_class_fixtures(cls):
      super(TestConstantPrice, cls).init_class_fixtures()
  
      cls.equity = cls.asset_finder.retrieve_asset(
          cls.asset_finder.equities_sids[0],
      )
      cls.future = cls.asset_finder.retrieve_asset(
          cls.asset_finder.futures_sids[0],
      )
  
      cls.trading_minutes = pd.Index(
          cls.trading_calendar.minutes_for_sessions_in_range(
              cls.START_DATE,
              cls.END_DATE,
          ),
      )
      cls.closes = pd.Index(
          cls.trading_calendar.session_closes_in_range(
              cls.START_DATE,
              cls.END_DATE,
          ),
      )
      cls.closes.name = None
  
imports: import unittest
  import numpy
  import pandas
  from zipline import api
  from zipline.assets import Equity, Future
  from zipline.assets.synthetic import make_commodity_future_info
  from zipline.data.data_portal import DataPortal
  from zipline.data.resample import MinuteResampleSessionBarReader
  from zipline.testing import parameter_space, prices_generating_returns, simulate_minutes_for_day
  from zipline.testing.fixtures import WithMakeAlgo, WithConstantEquityMinuteBarData, WithConstantFutureMinuteBarData, WithWerror, ZiplineTestCase
  from zipline.testing.predicates import assert_equal, wildcard
label_desc: Use image node_id 2 for calling the TestConstantPrice obj's underlying member method code with example usage: obj.init_class_fixtures(cls) without return types