code: def test_copy_with_factors(self):
      self.graph.add_edges_from([[("a", "b"), ("b", "c")]])
      phi1 = DiscreteFactor(["a", "b"], [2, 2], np.random.rand(4))
      phi2 = DiscreteFactor(["b", "c"], [2, 2], np.random.rand(4))
      self.graph.add_factors(phi1, phi2)
      graph_copy = self.graph.copy()
      self.assertIsInstance(graph_copy, ClusterGraph)
      self.assertEqual(
          hf.recursive_sorted(self.graph.nodes()),
          hf.recursive_sorted(graph_copy.nodes()),
      )
      self.assertEqual(
          hf.recursive_sorted(self.graph.edges()),
          hf.recursive_sorted(graph_copy.edges()),
      )
      self.assertTrue(graph_copy.check_model())
      self.assertEqual(
          self.graph.get_factors(), graph_copy.get_factors()
      )
      self.graph.remove_factors(phi1, phi2)
      self.assertTrue(
          phi1 not in self.graph.factors
          and phi2 not in self.graph.factors
      )
      self.assertTrue(
          phi1 in graph_copy.factors and phi2 in graph_copy.factors
      )
      self.graph.add_factors(phi1, phi2)
      self.graph.factors[0] = DiscreteFactor(
          ["a", "b"], [2, 2], np.random.rand(4)
      )
      self.assertNotEqual(
          self.graph.get_factors()[0], graph_copy.get_factors()[0]
      )
      self.assertNotEqual(self.graph.factors, graph_copy.factors)
  
imports: import unittest
  import numpy
  from pgmpy.factors.discrete import DiscreteFactor
  from pgmpy.models import ClusterGraph
  from pgmpy.tests import help_functions
label_desc: Use image node_id 7 for calling the TestClusterGraphMethods obj's underlying member method code with example usage: obj.test_copy_with_factors() without return types