code: def setup_class(cls, *args, **kwargs):
      super().setup_class(missing="partial", test_against_KFAS=False)
      cls.true_llf = 1518.449598
  
imports: import os
  import numpy
  import pandas
  from numpy.testing import assert_allclose, assert_equal
  import pytest
  from statsmodels import datasets
  from statsmodels.tsa.statespace import mlemodel, sarimax, structural, varmax
  from statsmodels.tsa.statespace.simulation_smoother import SIMULATION_STATE, SIMULATION_DISTURBANCE, SIMULATION_ALL
label_desc: Use image node_id 1 for calling the TestMultivariateVARKnownMissingPartial obj's underlying member method code with example usage: obj.setup_class(cls) without return types