code: def testForwaredFilterConsectiveness(self):
      self.dlm1._forwardFilter(start=0, end=19, renew=False)
      filtered1 = self.dlm1.result.filteredObs
  
      self.dlm1._initialize()
  
      self.dlm1._forwardFilter(start=0, end=13)
      self.dlm1.result.filteredSteps = (0, 13)
      self.dlm1._forwardFilter(start=13, end=19)
      filtered2 = self.dlm1.result.filteredObs
  
      self.assertAlmostEqual(
          np.sum(np.array(filtered1) - np.array(filtered2)), 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 5 for calling the test_dlm obj's underlying member method code with example usage: obj.testForwaredFilterConsectiveness() without return types