ci: include python 3.14 rc3 to the GitHub action matrix

.github/workflows/build.yml

@@ -10,8 +10,9 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
         required-dependencies: ["minimum", "latest"]
+
     name: py ${{ matrix.python-version }} with ${{ matrix.required-dependencies }} required deps
     steps:
       - uses: actions/checkout@v5

pyproject.toml

@@ -69,7 +69,7 @@ all = [
 dev = [
     "hatch>=1.13.0",
     "ruff>=0.9.5",
-    "duckdb>=1.0",
+    "duckdb>=1.0; python_version<\"3.14\"",
     "ipython",
     "ipykernel",
     "pandas>=1.1.3",
@@ -82,7 +82,7 @@ dev = [
     "pandas-stubs",
     "types-jsonschema",
     "types-setuptools",
-    "geopandas",
+    "geopandas>=0.14.3; python_version<\"3.14\"",
     "polars>=0.20.3",
     "taskipy>=1.14.1",
     "tomli>=2.2.1",
@@ -127,7 +127,7 @@ doc     = { features = ["all", "dev", "doc"] }
 [tool.hatch.envs.hatch-test]
 # https://hatch.pypa.io/latest/tutorials/testing/overview/
 features = ["all", "dev", "doc"]
-matrix   = [{ python = ["3.9", "3.10", "3.11", "3.12", "3.13"] }]
+matrix   = [{ python = ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"] }]
 
 [tool.ruff]
 extend-exclude = [
@@ -319,7 +319,8 @@ addopts = [
 markers = [
     "slow: Label tests as slow (deselect with '-m \"not slow\"')",
     "datasets_debug: Disabled by default due to high number of requests",
-    "no_xdist: Unsafe to run in parallel"
+    "no_xdist: Unsafe to run in parallel",
+    "geospatial: Tests that require geopandas (deselect with '-m \"not geospatial\"')"
 ]
 
 [tool.mypy]

tests/__init__.py

@@ -112,6 +112,30 @@ def windows_has_tzdata() -> bool:
     find_spec("scipy") is None, reason="`scipy` not installed."
 )
 
+skip_requires_geopandas: pytest.MarkDecorator = pytest.mark.skipif(
+    find_spec("geopandas") is None, reason="`geopandas` not installed."
+)
+"""
+``pytest.mark.skipif`` decorator.
+
+Applies when `geopandas`_ import would fail.
+
+.. _geopandas:
+    https://geopandas.org/
+"""
+
+skip_requires_duckdb: pytest.MarkDecorator = pytest.mark.skipif(
+    find_spec("duckdb") is None, reason="`duckdb` not installed."
+)
+"""
+``pytest.mark.skipif`` decorator.
+
+Applies when `duckdb`_ import would fail.
+
+.. _duckdb:
+    https://duckdb.org/
+"""
+
 
 @overload
 def skip_requires_pyarrow(

tests/test_datasets.py

@@ -17,7 +17,7 @@
 from altair.datasets import Loader
 from altair.datasets._exceptions import AltairDatasetsError
 from altair.datasets._typing import Dataset, Metadata
-from tests import no_xdist, skip_requires_pyarrow
+from tests import no_xdist, skip_requires_geopandas, skip_requires_pyarrow
 
 if TYPE_CHECKING:
     from collections.abc import Mapping
@@ -548,6 +548,8 @@ def test_pyarrow_read_json(
 
 @datasets_spatial
 @backends_no_polars
+@pytest.mark.geospatial
+@skip_requires_geopandas
 def test_spatial(backend: _Backend, name: Dataset) -> None:
     load = Loader.from_backend(backend)
 

tests/vegalite/v6/test_api.py

@@ -17,7 +17,6 @@
 from importlib.util import find_spec
 from typing import TYPE_CHECKING
 
-import duckdb
 import jsonschema
 import narwhals.stable.v1 as nw
 import pandas as pd
@@ -28,11 +27,18 @@
 import altair as alt
 from altair.utils.core import use_signature
 from altair.utils.schemapi import Optional, SchemaValidationError, Undefined
-from tests import skip_requires_pyarrow, skip_requires_vl_convert, slow
+from tests import (
+    skip_requires_duckdb,
+    skip_requires_pyarrow,
+    skip_requires_vl_convert,
+    slow,
+)
 
 if TYPE_CHECKING:
     from typing import Any
 
+    import duckdb
+
     from altair.vegalite.v6.api import _Conditional, _Conditions
     from altair.vegalite.v6.schema._typing import Map
 
@@ -1824,9 +1830,12 @@ def test_polars_date_32():
 
 
 @skip_requires_pyarrow(requires_tzdata=True)
+@skip_requires_duckdb
 def test_interchange_with_date_32():
     # Test that objects which Narwhals only supports at the interchange
     # level can be plotted when they contain date32 columns.
+    import duckdb
+
     df = pl.DataFrame(  # noqa: F841
         {"a": [1, 2, 3], "b": [date(2020, 1, 1), date(2020, 1, 2), date(2020, 1, 3)]}
     )
@@ -1840,13 +1849,16 @@ def test_interchange_with_date_32():
 
 
 @skip_requires_pyarrow(requires_tzdata=True)
+@skip_requires_duckdb
 def test_interchange_with_vegafusion(monkeypatch: pytest.MonkeyPatch):
     # Test that objects which Narwhals only supports at the interchange
     # level don't get converted to PyArrow unnecessarily when plotted
     # with the vegafusion transformer.
     # TODO: this test can be drastically simplified when some level of
     # DuckDB support in VegaFusion, as it can then just be `alt.Chart(rel_df)`
     # without DuckDBWithInterchangeSupport.
+    import duckdb
+
     df = pl.DataFrame(  # noqa: F841
         {
             "a": [1, 2, 3],