code: def init_instance_fixtures(self):
      super(TestRisk, self).init_instance_fixtures()
      self.start_session = pd.Timestamp("2006-01-01", tz="UTC")
      self.end_session = self.trading_calendar.minute_to_session_label(
          pd.Timestamp("2006-12-31", tz="UTC"), direction="previous"
      )
      self.sim_params = SimulationParameters(
          start_session=self.start_session,
          end_session=self.end_session,
          trading_calendar=self.trading_calendar,
      )
      self.algo_returns = factory.create_returns_from_list(
          RETURNS, self.sim_params
      )
      self.benchmark_returns = factory.create_returns_from_list(
          BENCHMARK, self.sim_params
      )
      self.metrics = risk.RiskReport(
          self.algo_returns,
          self.sim_params,
          benchmark_returns=self.benchmark_returns,
          trading_calendar=self.trading_calendar,
          treasury_curves=self.env.treasury_curves,
      )
  
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 1 for calling the TestRisk obj's underlying member method code with example usage: obj.init_instance_fixtures() without return types