Remove mypy overrides for tests/test_util/test_util.py (#13584)

Author: adamtheturtle

pyproject.toml

@@ -286,7 +286,6 @@ module = [
     "tests.test_transforms.test_transforms_post_transforms_images",
     "tests.test_transforms.test_transforms_reorder_nodes",
     # tests/test_util
-    "tests.test_util.test_util",
     "tests.test_util.test_util_display",
     "tests.test_util.test_util_docutils",
     "tests.test_util.test_util_inventory",

tests/test_util/test_util.py

@@ -2,6 +2,8 @@
 
 from __future__ import annotations
 
+from typing import TYPE_CHECKING
+
 import pytest
 
 import sphinx.util
@@ -29,8 +31,11 @@
     relative_uri,
 )
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
-def test_ensuredir(tmp_path):
+def test_ensuredir(tmp_path: Path) -> None:
     # Does not raise an exception for an existing directory.
     ensuredir(tmp_path)