fix tests to work with fake potcar library

Author: esoteric-ephemera

pymatgen/io/validation/check_incar.py

@@ -4,7 +4,7 @@
 import numpy as np
 from pydantic import Field
 
-from pymatgen.io.validation.common import SETTINGS, BaseValidator, VaspFiles
+from pymatgen.io.validation.common import SETTINGS, BaseValidator
 from pymatgen.io.validation.vasp_defaults import InputCategory, VaspParam
 
 from typing import TYPE_CHECKING

tests/conftest.py

@@ -2,22 +2,24 @@
 import pytest
 
 from monty.serialization import loadfn
+from pymatgen.core import SETTINGS as PMG_SETTINGS
+
 from pymatgen.io.validation.common import VaspFiles
 
 _test_dir = Path(__file__).parent.joinpath("test_files").resolve()
 
+FAKE_POTCAR_DIR = _test_dir / "vasp" / "fake_potcar"
+pytest.MonkeyPatch().setitem(PMG_SETTINGS, "PMG_VASP_PSP_DIR", str(FAKE_POTCAR_DIR))
 
 @pytest.fixture(scope="session")
 def test_dir():
     return _test_dir
 
-
 vasp_calc_data: dict[str, VaspFiles] = {
     k: VaspFiles(**loadfn(_test_dir / "vasp" / f"{k}.json.gz"))
     for k in ("Si_uniform", "Si_static", "Si_old_double_relax")
 }
 
-
 def incar_check_list():
     """Pre-defined list of pass/fail tests."""
     return loadfn(_test_dir / "vasp" / "scf_incar_check_list.yaml")