code: def test_dimensions(self):
      assert_equal(self.res.filter_results.k_states, 1)
      assert_equal(self.res.filter_results.k_posdef, 2)
      assert_equal(self.res.smoothed_state_disturbance.shape, (2, 10))
  
      assert_equal(self.res_desired.filter_results.k_states, 1)
      assert_equal(self.res_desired.filter_results.k_posdef, 1)
      assert_equal(
          self.res_desired.smoothed_state_disturbance.shape, (1, 10)
      )
  
imports: import numpy
  import pandas
  import os
  import pytest
  from statsmodels.tsa.statespace import mlemodel, sarimax
  from statsmodels import datasets
  from numpy.testing import assert_equal, assert_allclose, assert_raises
label_desc: Use image node_id 2 for calling the TestLargeStateCovAR1 obj's underlying member method code with example usage: obj.test_dimensions() without return types