def METHOD_NAME(self):
    model_devi = calc_model_devi(
        self.coord,
        None,
        self.mixed_atype,
        self.graphs,
        frequency=self.freq,
        fname=self.output,
        mixed_type=True,
    )
    self.assertAlmostEqual(model_devi[0][0], 0)
    self.assertAlmostEqual(model_devi[1][0], self.freq)
    np.testing.assert_almost_equal(model_devi[0][1:8], self.expect[0][1:8], 6)
    np.testing.assert_almost_equal(model_devi[1][1:8], self.expect[1][1:8], 6)
    self.assertTrue(os.path.isfile(self.output))