Function test_errors

xarray/tests/test_interp.py:512–543

(use_dask: bool)

@requires_scipy
@pytest.mark.parametrize("use_dask", [True, False])
def test_errors(use_dask: bool) -> None:
    # spline is unavailable
    da = xr.DataArray([0, 1, np.nan, 2], dims="x", coords={"x": range(4)})
    if not has_dask and use_dask:
        pytest.skip("dask is not installed in the environment.")
        da = da.chunk()

    for method in ["spline"]:
        with pytest.raises(ValueError), pytest.warns(PendingDeprecationWarning):
            da.interp(x=[0.5, 1.5], method=method)  # type: ignore[arg-type]

    # not sorted
    if use_dask:
        da = get_example_data(3)
    else:
        da = get_example_data(0)

    result = da.interp(x=[-1, 1, 3], kwargs={"fill_value": 0.0})
    assert not np.isnan(result.values).any()
    result = da.interp(x=[-1, 1, 3])
    assert np.isnan(result.values).any()

    # invalid method
    with pytest.raises(ValueError):
        da.interp(x=[2, 0], method="boo")  # type: ignore[arg-type]
    with pytest.raises(ValueError):
        da.interp(y=[2, 0], method="boo")  # type: ignore[arg-type]

    # object-type DataArray cannot be interpolated
    da = xr.DataArray(["a", "b", "c"], dims="x", coords={"x": [0, 1, 2]})
    with pytest.raises(TypeError):
        da.interp(x=0)


@requires_scipy