def METHOD_NAME(self):
    # tests the AGF2 ionization potentials for BeH/cc-pvdz
    e_ip, v_ip = self.gf2.ipagf2(nroots=3)
    v_ip = [np.linalg.norm(v)**2 for v in v_ip]
    self.assertAlmostEqual(e_ip[0], 0.3003522286132736, 6)
    self.assertAlmostEqual(e_ip[1], 0.5107596660196604, 6)
    self.assertAlmostEqual(e_ip[2], 0.5318094633979558, 6)
    self.assertAlmostEqual(v_ip[0], 0.9962231685493768, 6)
    self.assertAlmostEqual(v_ip[1], 0.9789822411853315, 6)
    self.assertAlmostEqual(v_ip[2], 0.9809062972345126, 6)