diff --git a/verification/test12/output_ref.json b/verification/test12/output_ref.json
new file mode 100644
index 000000000..13e268859
--- /dev/null
+++ b/verification/test12/output_ref.json
@@ -0,0 +1,259 @@
+{
+    "comm_world_size": 1,
+    "context": {
+        "chemical_formula": "C4",
+        "config": {
+            "control": {
+                "beta_chunk_size": 256,
+                "cyclic_block_size": 16,
+                "fft_mode": "parallel",
+                "gen_evp_solver_name": "lapack",
+                "gvec_chunk_size": 500000,
+                "mpi_grid_dims": [
+                    1,
+                    1
+                ],
+                "num_bands_to_print": 10,
+                "ortho_rf": false,
+                "output": "stdout:",
+                "print_checksum": false,
+                "print_forces": false,
+                "print_hash": false,
+                "print_memory_usage": false,
+                "print_neighbors": false,
+                "print_performance": false,
+                "print_stress": false,
+                "print_timers": true,
+                "processing_unit": "cpu",
+                "reduce_gvec": false,
+                "rmt_max": 2.2,
+                "spglib_tolerance": 1e-06,
+                "std_evp_solver_name": "lapack",
+                "use_second_variation": true,
+                "verbosity": 1,
+                "verification": 0
+            },
+            "hubbard": {
+                "full_orthogonalization": false,
+                "local": [],
+                "nonlocal": [],
+                "normalize": false,
+                "orthogonalize": false,
+                "simplified": false
+            },
+            "iterative_solver": {
+                "converge_by_energy": 1,
+                "early_restart": 0.5,
+                "empty_states_tolerance": 0,
+                "energy_tolerance": 0.01,
+                "extra_ortho": false,
+                "init_eval_old": true,
+                "init_subspace": "lcao",
+                "locking": true,
+                "min_num_res": 0,
+                "num_singular": -1,
+                "num_steps": 20,
+                "relative_tolerance": 0,
+                "residual_tolerance": 1e-06,
+                "subspace_size": 2,
+                "type": "exact"
+            },
+            "locked": true,
+            "mixer": {
+                "beta": 0.5,
+                "beta0": 0.15,
+                "beta_scaling_factor": 1.0,
+                "linear_mix_rms_tol": 1000000.0,
+                "max_history": 4,
+                "type": "anderson",
+                "use_hartree": false
+            },
+            "nlcg": {
+                "T": 300.0,
+                "kappa": 0.3,
+                "maxiter": 300,
+                "procssing_unit": "",
+                "restart": 10,
+                "tau": 0.1,
+                "tol": 1e-09
+            },
+            "parameters": {
+                "auto_rmt": 1,
+                "aw_cutoff": 0.0,
+                "core_relativity": "dirac",
+                "density_tol": 1e-08,
+                "electronic_structure_method": "full_potential_lapwlo",
+                "energy_tol": 1e-06,
+                "extra_charge": 0,
+                "gamma_point": false,
+                "gk_cutoff": 10.0,
+                "hubbard_correction": false,
+                "lmax_apw": 6,
+                "lmax_pot": 6,
+                "lmax_rho": 6,
+                "molecule": false,
+                "ngridk": [
+                    2,
+                    2,
+                    2
+                ],
+                "nn_radius": -1,
+                "num_bands": -1,
+                "num_dft_iter": 1,
+                "num_fv_states": 22,
+                "num_mag_dims": 0,
+                "precision_gs": "auto",
+                "precision_hs": "fp64",
+                "precision_wf": "fp64",
+                "pw_cutoff": 20.0,
+                "reduce_aux_bf": 0,
+                "shiftk": [
+                    0,
+                    0,
+                    0
+                ],
+                "smearing": "gaussian",
+                "smearing_width": 0.01,
+                "so_correction": false,
+                "use_ibz": true,
+                "use_scf_correction": true,
+                "use_symmetry": true,
+                "valence_relativity": "zora",
+                "vk": [],
+                "xc_dens_tre": -1,
+                "xc_functionals": [
+                    "XC_LDA_X",
+                    "XC_LDA_C_PZ"
+                ]
+            },
+            "settings": {
+                "always_update_wf": true,
+                "auto_enu_tol": 0,
+                "fft_grid_size": [
+                    32,
+                    32,
+                    120
+                ],
+                "fp32_to_fp64_rms": 0,
+                "itsol_tol_min": 1e-13,
+                "itsol_tol_ratio": 0,
+                "itsol_tol_scale": [
+                    0.1,
+                    0.5
+                ],
+                "min_occupancy": 1e-14,
+                "mixer_rms_min": 1e-16,
+                "nprii_aug": 20,
+                "nprii_beta": 20,
+                "nprii_rho_core": 20,
+                "nprii_vloc": 200,
+                "radial_grid": "exponential, 1.0",
+                "sht_coverage": 0
+            },
+            "unit_cell": {
+                "atom_coordinate_units": "lattice",
+                "atom_files": {
+                    "C": "C.json"
+                },
+                "atom_types": [
+                    "C"
+                ],
+                "atoms": {
+                    "C": [
+                        [
+                            1.0964694103629494e-16,
+                            1.0964694091019036e-16,
+                            0.2500000180525946
+                        ],
+                        [
+                            3.28940822703792e-16,
+                            3.289408227305712e-16,
+                            0.7500000541577834
+                        ],
+                        [
+                            0.33333002419124574,
+                            0.6666700483832138,
+                            0.2500000180525946
+                        ],
+                        [
+                            0.6666700470984978,
+                            0.3333300242949251,
+                            0.7500000541577834
+                        ]
+                    ]
+                },
+                "lattice_vectors": [
+                    [
+                        4.66492088466573,
+                        0.0,
+                        0.0
+                    ],
+                    [
+                        -2.332460442332865,
+                        4.039939990837293,
+                        0.0
+                    ],
+                    [
+                        0.0,
+                        0.0,
+                        16.70667062629131
+                    ]
+                ],
+                "lattice_vectors_scale": 1.0
+            },
+            "vcsqnm": {
+                "alpha0": 0.01,
+                "eps_subsp": 0.001,
+                "forces_tol": 0.0001,
+                "initial_step_size": -0.1,
+                "lattice_weight": 2.0,
+                "nhist_max": 10,
+                "num_steps": 300,
+                "stress_tol": 1e-05
+            }
+        },
+        "fft_coarse_grid": [
+            32,
+            32,
+            120
+        ],
+        "mpi_grid": [
+            1,
+            1
+        ],
+        "num_atoms": 4,
+        "omega": 314.85392190808267
+    },
+    "counters": {
+        "band_evp_work_count": 0.0,
+        "local_operator_num_applied": 0
+    },
+    "git_hash": "b43f014d839469298791a703c04024ce8b8804ad",
+    "ground_state": {
+        "band_gap": 0.0,
+        "converged": false,
+        "core_leakage": 0.0,
+        "efermi": 0.5411339247126776,
+        "energy": {
+            "bxc": 0.0,
+            "core_eval_sum": 0.0,
+            "entropy_sum": -0.0019924480083639744,
+            "enuc": -213.30630369396795,
+            "eval_sum": -34.82289714572258,
+            "ewald": 0.0,
+            "exc": -24.61567820986012,
+            "kin": 250.06526733254603,
+            "scf_correction": -32.26303790853922,
+            "total": -146.33435903415565,
+            "veff": -284.8881644782686,
+            "vha": -252.42921310866876,
+            "vxc": -32.46012247730339
+        },
+        "etot_history": [
+            -146.33435903415565
+        ],
+        "scf_time": 112.658467653
+    },
+    "task": 0,
+    "threads_per_rank": 16
+}
\ No newline at end of file