def METHOD_NAME(self):
    # create an INCAR
    incar = self.ref_incar
    incar.write_file("INCAR")
    # modify and test
    ft = ModifyIncar(
        incar_update={"ISMEAR": 1000},
        incar_multiply={"ENCUT": 1.5},
        incar_dictmod={"_inc": {"ISPIN": -1}},
    )
    ft = load_object(ft.to_dict())  # simulate database insertion
    ft.run_task({})
    incar_mod = Incar.from_file("INCAR")
    self.assertEqual(incar_mod["ISMEAR"], 1000)
    self.assertEqual(incar_mod["ENCUT"], 780)
    self.assertEqual(incar_mod["ISPIN"], 1)