def METHOD_NAME(self):
    mf = pbcdft.RKS(cell).density_fit()
    mf.xc = 'camb3lyp'
    mf.kernel()
    self.assertAlmostEqual(mf.e_tot, -2.474520122522153, 6)
    mf.omega = .15
    mf.kernel()
    self.assertAlmostEqual(mf.e_tot, -2.4766238116030683, 6)