Disable python.net tests for python 3.13

Author: freakboy3742

pyproject.toml

@@ -77,7 +77,8 @@ flatpak_sdk = "org.gnome.Sdk"
 
 [tool.briefcase.app.testbed.windows]
 requires = [
-    "pythonnet>=3.0.0rc6",
+    # Python.net isn't avaialble for 3.13 yet.
+    "pythonnet>=3.0.0rc6; python_version < '3.13'",
     # Windows doesn't provide the zoneinfo TZ database; use the Python provided one
     "tzdata",
 ]

tests/test_windows.py

@@ -6,10 +6,13 @@
 
 import pytest
 
+from .test_thirdparty import xfail_if_not_installed
+
 if sys.platform != "win32":
     pytest.skip("Skipping Windows-only tests", allow_module_level=True)
 
 
+@xfail_if_not_installed("pythonnet")
 def test_pythonnet():
     "Python.net integration works as expected"
     # Set up CLR