def METHOD_NAME(self):
    with npt.assert_raises(ValueError):
        kwargs_tnfw_e = {
            "Rs": 1,
            "alpha_Rs": 0.1,
            "r_trunc": 5,
            "e1": 0.1,
            "e2": -0.02,
        }
        self.tnfw_e.density_lens(1, **kwargs_tnfw_e)