def METHOD_NAME(self):
    mf = dft.UKS(h4)
    mf.grids.level = 4
    mf.xc = 'lda,vwn'
    mf.conv_tol = 1e-14
    mf.kernel()
    e2 = mf.Hessian().kernel()
    self.assertAlmostEqual(lib.fp(e2), -0.058957876613586674, 3)
    e2ref = finite_diff(mf)
    self.assertAlmostEqual(abs(e2-e2ref).max(), 0, 4)