code: def test_get_cardinality_with_node(self):
      self.graph.add_nodes_from(["a", "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_nodes_from([phi1, phi2])
      self.graph.add_edges_from(
          [("a", phi1), ("b", phi1), ("b", phi2), ("c", phi2)]
      )
      self.graph.add_factors(phi1, phi2)
      self.assertEqual(self.graph.get_cardinality("a"), 2)
      self.assertEqual(self.graph.get_cardinality("b"), 2)
      self.assertEqual(self.graph.get_cardinality("c"), 2)
  
imports: import numpy
  import unittest
  from pgmpy.factors.discrete import DiscreteFactor
  from pgmpy.models import FactorGraph
  from pgmpy.models import MarkovNetwork
  from pgmpy.models import JunctionTree
  from pgmpy.tests import help_functions
label_desc: Use image node_id 3 for calling the TestFactorGraphMethods obj's underlying member method code with example usage: obj.test_get_cardinality_with_node() without return types