code: def _test_factory(self):
      returns = [0.1] * 100
      r_objects = factory.create_returns_from_list(
          returns, self.sim_params
      )
      self.assertTrue(
          r_objects.index[-1] <= pd.Timestamp("2006-12-31", tz="UTC")
      )
  
imports: import datetime
  import calendar
  import pandas
  import numpy
  import catalyst.finance.risk
  from catalyst.utils import factory
  from catalyst.finance.trading import SimulationParameters
  from catalyst.testing.fixtures import WithTradingEnvironment, CatalystTestCase
  from catalyst.finance.risk.period import RiskMetricsPeriod
label_desc: Use image node_id 2 for calling the TestRisk obj's underlying member method code with example usage: obj._test_factory() without return types