def METHOD_NAME(self):
    from porespy import beta
    np.random.seed(1)
    im = ps.generators.blobs(shape=[100, 100, 100], porosity=0.7)
    res = beta.tortuosity_gdd(im=im, scale_factor=3)
    np.testing.assert_approx_equal(res.tau[0], 1.3940746215566113, significant=5)
    np.testing.assert_approx_equal(res.tau[1], 1.4540191053977147, significant=5)
    np.testing.assert_approx_equal(res.tau[2], 1.4319705063316652, significant=5)