def test_full_2d(): check_ff(get_ff_graphene(), FullCellDOF, 6, {})
def test_aniso_2d(): check_ff(get_ff_graphene(), AnisoCellDOF, 2, {})
def test_iso_2d(): check_ff(get_ff_graphene(), IsoCellDOF, 1, {})
def test_strain_2d(): check_ff(get_ff_graphene(), StrainCellDOF, 3, {})