code: def test_evidence(self):
      res1 = self.infer.query([("Y", 4)], evidence={("Y", 2): 0})
      expected1 = DiscreteFactor([("Y", 4)], [2], [0.2232, 0.7768])
      self.assertTrue(res1.__eq__(expected1, atol=0.01))
  
imports: import unittest
  from pgmpy import config
  from pgmpy.factors.discrete import DiscreteFactor, TabularCPD
  from pgmpy.inference import ApproxInference, VariableElimination
  from pgmpy.models import DynamicBayesianNetwork
  from pgmpy.utils import get_example_model
label_desc: Use image node_id 3 for calling the TestApproxInferenceDBN obj's underlying member method code with example usage: obj.test_evidence() without return types