tests: fix varioun versions of sphinx

noxfile.py

@@ -62,6 +62,5 @@ def tests(session):
     """
     Run the unit and regular tests.
     """
-    # Setuptools is required due to sphinx installing sphinxcontrib extensions that use pkg_resources (fixed upstream but not released yet)
-    session.install(".", "pytest", "setuptools")
+    session.install(".[test]", silent=False)
     session.run("pytest", *session.posargs)

pyproject.toml

@@ -42,7 +42,11 @@ dynamic = ["version"]
 Homepage = "https://github.com/scikit-build/moderncmakedomain"
 
 [project.optional-dependencies]
-test = ["pytest"]
+test = [
+    # Setuptools is required due to sphinx installing sphinxcontrib extensions that use pkg_resources (fixed upstream but not released yet)
+    "pytest",
+    "defusedxml",
+]
 
 [tool.pytest.ini_options]
 minversion = "6.0"

tests/conftest.py

@@ -1,9 +1,25 @@
 import pytest
 
-from pathlib import Path
+import sys
+
+if sys.version_info < (3, 8):
+    from importlib_metadata import version
+else:
+    from importlib.metadata import version
+
+sphinx_vesion = tuple(int(d) for d in version("sphinx").split(".")[:2])
 
 pytest_plugins = 'sphinx.testing.fixtures'
 
-@pytest.fixture(scope="session")
-def rootdir():
-    return Path(__file__).parent.absolute() / "roots"
+if sphinx_vesion < (7, 3):
+    from sphinx.testing.path import path
+
+    @pytest.fixture(scope="session")
+    def rootdir():
+        return path(__file__).parent.abspath() / "roots"
+else:
+    from pathlib import Path
+
+    @pytest.fixture(scope="session")
+    def rootdir():
+        return Path(__file__).parent.absolute() / "roots"