def METHOD_NAME(self):
    symbol = pybamm.PrimaryBroadcast(0, "negative electrode")
    self.assertEqual(False, pybamm.is_constant_and_can_evaluate(symbol))
    symbol = pybamm.StateVector(slice(0, 1))
    self.assertEqual(False, pybamm.is_constant_and_can_evaluate(symbol))
    symbol = pybamm.Scalar(0)
    self.assertEqual(True, pybamm.is_constant_and_can_evaluate(symbol))