Fix test failures

Author: AA-Turner

.github/workflows/test.yml

@@ -31,14 +31,20 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Setup Python ${{ matrix.python }}
+      - name: Set up Python ${{ matrix.python }}
         uses: actions/setup-python@v4
+        if: "!endsWith(matrix.python, '-dev')"
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Set up Python ${{ matrix.python }} (deadsnakes)
+        uses: deadsnakes/action@v2.1.1
+        if: "endsWith(matrix.python, '-dev')"
         with:
           python-version: ${{ matrix.python }}
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          python -m pip install --upgrade pytest
+          python -m pip install .[test]
           python -m pip install "Sphinx @ git+https://github.com/sphinx-doc/sphinx"
 
       - name: Test with pytest

sphinxcontrib/serializinghtml/__init__.py

@@ -86,6 +86,7 @@ def handle_page(self, pagename, ctx, templatename='page.html',
                     outfilename=None, event_arg=None):
         # type: (str, Dict, str, str, Any) -> None
         ctx['current_page_name'] = pagename
+        ctx.setdefault('pathto', lambda p: p)
         self.add_sidebars(pagename, ctx)
 
         if not outfilename:

tests/conftest.py

@@ -6,13 +6,13 @@
     :license: BSD, see LICENSE for details.
 """
 
-import pytest
+from pathlib import Path
 
-from sphinx.testing.path import path
+import pytest
 
 pytest_plugins = 'sphinx.testing.fixtures'
 
 
 @pytest.fixture(scope='session')
 def rootdir():
-    return path(__file__).parent.abspath() / 'roots'
+    return Path(__file__).resolve().parent / 'roots'