code: def init_instance_fixtures(self):
      super(TestRisk, self).init_instance_fixtures()
  
      start_session = pd.Timestamp("2006-01-01", tz="UTC")
      end_session = pd.Timestamp("2006-12-29", tz="UTC")
  
      self.sim_params = SimulationParameters(
          start_session=start_session,
          end_session=end_session,
          trading_calendar=self.trading_calendar,
      )
      self.algo_returns = factory.create_returns_from_list(
          RETURNS, self.sim_params
      )
      self.cumulative_metrics = risk.RiskMetricsCumulative(
          self.sim_params,
          treasury_curves=self.env.treasury_curves,
          trading_calendar=self.trading_calendar,
      )
      for dt, returns in self.algo_returns.iteritems():
          self.cumulative_metrics.update(
              dt, returns, BENCHMARK_BASE, 0.0
          )
  
file_path: catalyst/tests/risk/test_risk_cumulative.py
imports: import numpy
  import pandas
  import catalyst.finance.risk
  from catalyst.utils import factory
  from catalyst.testing.fixtures import WithTradingEnvironment, CatalystTestCase
  from catalyst.finance.trading import SimulationParameters
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