Catch property errors using jaraco.test.property_error. Fixes #24.

cssutils/tests/test_property.py

@@ -3,6 +3,7 @@
 import xml.dom
 
 import pytest
+from jaraco.test import property_error
 
 from . import basetest
 import cssutils
@@ -158,17 +159,12 @@ def test_name(self):
         self.assertEqual(r'c\olor', p.literalname)
         self.assertEqual('color', p.name)
 
-    @pytest.mark.xfail(
-        "sys.version_info > (3, 11)",
-        reason="jaraco/cssutils#24",
-    )
     def test_literalname(self):
         "Property.literalname"
         p = cssutils.css.property.Property(r'c\olor', 'red')
         self.assertEqual(r'c\olor', p.literalname)
-        self.assertRaisesMsg(
-            AttributeError, "can't set attribute", p.__setattr__, 'literalname', 'color'
-        )
+        with pytest.raises(AttributeError, match=property_error("Property.literalname")):
+            p.literalname = 'color'
 
     def test_validate(self):
         "Property.valid"

cssutils/tests/test_selector.py

@@ -9,6 +9,7 @@
 import xml.dom
 
 import pytest
+from jaraco.test import property_error
 
 from . import basetest
 import cssutils
@@ -380,20 +381,14 @@ def test_selectorText(self):
         # only set as not complete
         self.do_raise_r(tests, att='_setSelectorText')
 
-    @pytest.mark.xfail(
-        "sys.version_info > (3, 11)",
-        reason="jaraco/cssutils#24",
-    )
     def test_specificity(self):
         "Selector.specificity"
         selector = cssutils.css.Selector()
 
-        # readonly
-        def _set():
+        # property is read-only
+        with pytest.raises(AttributeError, match=property_error('Selector.specificity')):
             selector.specificity = 1
 
-        self.assertRaisesMsg(AttributeError, "can't set attribute", _set)
-
         tests = {
             '*': (0, 0, 0, 0),
             'li': (0, 0, 0, 1),

setup.cfg

@@ -57,6 +57,7 @@ testing =
 		python_version < "3.11"
 	cssselect
 	importlib_resources; python_version < "3.9"
+	jaraco.test >= 5.1
 
 docs =
 	# upstream