code: def setUp(self):
      self.factor1 = DiscreteFactor(
          ["a", "b"], [2, 2], np.random.rand(4)
      )
      self.factor2 = DiscreteFactor(
          ["b", "c"], [2, 2], np.random.rand(4)
      )
      self.factor3 = DiscreteFactor(
          ["d", "e"], [2, 2], np.random.rand(4)
      )
      self.factor4 = DiscreteFactor(
          ["e", "f"], [2, 2], np.random.rand(4)
      )
      self.factor5 = DiscreteFactor(
          ["a", "b", "e"], [2, 2, 2], np.random.rand(8)
      )
  
      self.graph1 = JunctionTree()
      self.graph1.add_edge(("a", "b"), ("b", "c"))
      self.graph1.add_factors(self.factor1, self.factor2)
  
      self.graph2 = JunctionTree()
      self.graph2.add_nodes_from([("a", "b"), ("b", "c"), ("d", "e")])
      self.graph2.add_edge(("a", "b"), ("b", "c"))
      self.graph2.add_factors(self.factor1, self.factor2, self.factor3)
  
      self.graph3 = JunctionTree()
      self.graph3.add_edges_from(
          [(("a", "b"), ("b", "c")), (("d", "e"), ("e", "f"))]
      )
      self.graph3.add_factors(
          self.factor1, self.factor2, self.factor3, self.factor4
      )
  
      self.graph4 = JunctionTree()
      self.graph4.add_edges_from(
          [
              (("a", "b", "e"), ("b", "c")),
              (("a", "b", "e"), ("e", "f")),
              (("d", "e"), ("e", "f")),
          ]
      )
      self.graph4.add_factors(
          self.factor5, self.factor2, self.factor3, self.factor4
      )
  
imports: import unittest
  import numpy
  from pgmpy.factors.discrete import DiscreteFactor
  from pgmpy.models import JunctionTree
  from pgmpy.tests import help_functions
label_desc: Use image node_id 1 for calling the TestJunctionTreeMethods obj's underlying member method code with example usage: obj.setUp() without return types