def METHOD_NAME(
    self,
):
    input = InputCell(1)
    output = ComputeCell(
        [
            input,
        ],
        lambda inputs: inputs[0] + 1,
    )
    cb1_observer = []
    cb2_observer = []
    callback1 = self.callback_factory(cb1_observer)
    callback2 = self.callback_factory(cb2_observer)
    output.add_callback(callback1)
    output.add_callback(callback2)
    output.remove_callback(callback1)
    output.remove_callback(callback1)
    output.remove_callback(callback1)
    input.value = 2
    self.assertEqual(cb1_observer, [])
    self.assertEqual(cb2_observer[-1], 3)