code: def testResetModelStatus(self):
      self.dlm1._forwardFilter(start=0, end=19, renew=False)
      self.dlm1.result.filteredSteps = (0, 19)
      self.assertAlmostEqual(
          self.dlm1.builder.model.obs, self.dlm1.result.filteredObs[19]
      )
  
      self.dlm1._resetModelStatus()
      self.assertAlmostEqual(
          np.sum(
              self.dlm1.builder.model.state
              - self.dlm1.builder.statePrior
          ),
          0.0,
      )
  
file_path: pydlm/tests/core/test_dlm.py
imports: from pydlm.modeler.trends import trend
  from pydlm.core._dlm import _dlm
  import logging
  import numpy
  import unittest
label_desc: Use image node_id 3 for calling the test_dlm obj's underlying member method code with example usage: obj.testResetModelStatus() without return types