Fix test_sectioning for Docutils 0.22+

Author: AA-Turner

sphinx/writers/text.py

@@ -479,6 +479,7 @@ def depart_document(self, node: Element) -> None:
         # XXX header/footer?
 
     def visit_section(self, node: Element) -> None:
+        assert self.sectionlevel < 7, node.pformat('  ')
         self._title_char = self.sectionchars[self.sectionlevel]
         self.sectionlevel += 1
 

tests/test_directives/test_directive_only.py

@@ -12,13 +12,7 @@
 if TYPE_CHECKING:
     from sphinx.testing.util import SphinxTestApp
 
-xfail_du_22 = pytest.mark.xfail(
-    docutils.__version_info__ >= (0, 22, 0, 'alpha', 0),
-    reason='expected failure on Docutils 0.22+',
-)
 
-
-@xfail_du_22
 @pytest.mark.sphinx('text', testroot='directive-only')
 def test_sectioning(app: SphinxTestApp) -> None:
     def getsects(section):