pyproject: add dependency group for test deps

Add a PEP 735 dependency group that installs a supported version of
pytest.  This allows downstream build systems (e.g. Fedora) to autodetect
test dependencies.  pip 25.1 (unreleased) will allow installing these
dependencies with `python -m pip install --group test`.

Signed-off-by: Benjamin Gilbert <[email protected]>

Author: bgilbert

pyproject.toml

@@ -31,6 +31,9 @@ requires-python = ">= 3.8"
 dependencies = ["Pillow"]
 dynamic = ["version"]
 
+[dependency-groups]
+test = ["pytest >= 7"]
+
 [project.urls]
 Homepage = "https://openslide.org/"
 Documentation = "https://openslide.org/api/python/"