code: def test_call_tree(self):
      def g(a):
          return a + 1
  
      def f(a):
          return g(a) + 1
  
      tr = TestTranspiler()
      f, _, _ = tr.transform(f, None)
  
      self.assertEqual(f(1), 1 - 1 + 1)
  
imports: import threading
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import transformer
  from nvidia.dali._autograph.pyct import transpiler
label_desc: Use image node_id 5 for calling the PyToPyTest obj's underlying member method code with example usage: obj.test_call_tree() and returns: unknown, unknown