def METHOD_NAME(self):
    mf = pbcdft.RKS(cell).mix_density_fit()
    mf.xc = 'camb3lyp'
    mf.kernel()
    self.assertAlmostEqual(mf.e_tot, -2.4745138538438827, 7)
    mf.omega = .15
    mf.kernel()
    self.assertAlmostEqual(mf.e_tot, -2.4766174820185456, 7)