code: def test_as_instanceof_cause():
      fake_address = "Fake address"
      fake_pid = 123
      value = 3
  
      class CustomException(Exception):
          def __init__(self, i):
              self.i = i
  
          def __str__(self):
              return "Custom Exception."
  
      try:
          raise CustomException(value)
      except Exception as e:
          em = ErrorMessage(
              b"Fake message id",
              fake_address,
              fake_pid,
              type(e),
              e,
              e.__traceback__,
          )
          assert "Fake message id" in repr(em)
          try:
              cause = em.as_instanceof_cause()
              # Test serialization.
              cause1 = pickle.loads(pickle.dumps(cause))
              assert type(cause) is type(cause1)
              raise cause
          except Exception as e1:
              e1 = pickle.loads(pickle.dumps(e1))
              # Check cause exception.
              assert isinstance(e1, CustomException)
              assert e1.i == value
              assert e1.address == fake_address
              assert e1.pid == fake_pid
              assert fake_address in str(e1)
              assert "Custom Exception" in str(e1)
              assert str(fake_pid) in str(e1)
              em1 = ErrorMessage(
                  b"Fake message id",
                  fake_address,
                  fake_pid,
                  type(e1),
                  e1,
                  e1.__traceback__,
              )
              try:
                  raise em1.as_instanceof_cause()
              except Exception as e2:
                  e2 = pickle.loads(pickle.dumps(e2))
                  # Check recursive cause exception.
                  assert isinstance(e2, CustomException)
                  assert e2.i == value
                  assert e2.address == fake_address
                  assert e2.pid == fake_pid
                  assert str(e2).count("Custom Exception") == 1
                  assert str(e2).count(fake_address) == 1
                  assert str(e2).count(str(fake_pid)) == 1
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_as_instanceof_cause() and returns: str