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Adding unit test for FieldSet without U or V field #2358

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Nov 4, 2025
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Adding unit test for FieldSet without U or V field #2358

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17 changes: 16 additions & 1 deletion tests/test_fieldset.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@
import pytest
import xarray as xr

from parcels import Field, VectorField, XGrid
from parcels import Field, ParticleFile, ParticleSet, VectorField, XGrid
from parcels._core.fieldset import CalendarError, FieldSet, _datetime_to_msg
from parcels._datasets.structured.circulation_models import datasets as datasets_circulation_models
from parcels._datasets.structured.generic import T as T_structured
Expand Down Expand Up @@ -94,6 +94,21 @@ def test_fieldset_gridset(fieldset):
assert len(fieldset.gridset) == 2


def test_fieldset_no_UV(tmp_zarrfile):
grid = XGrid.from_dataset(ds, mesh="flat")
fieldset = FieldSet([Field("P", ds["U_A_grid"], grid)])

def SampleP(particles, fieldset):
particles.dlon += fieldset.P[particles]

pset = ParticleSet(fieldset, lon=0, lat=0)
ofile = ParticleFile(tmp_zarrfile, outputdt=np.timedelta64(1, "s"))
pset.execute(SampleP, runtime=np.timedelta64(1, "s"), dt=np.timedelta64(1, "s"), output_file=ofile)

ds_out = xr.open_zarr(tmp_zarrfile)
assert ds_out["lon"].shape == (1, 2)


@pytest.mark.parametrize("ds", [pytest.param(ds, id=k) for k, ds in datasets_structured.items()])
def test_fieldset_from_structured_generic_datasets(ds):
grid = XGrid.from_dataset(ds, mesh="flat")
Expand Down
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