diff --git a/pyproject.toml b/pyproject.toml
index 50cd52b3b..86e5e895e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -218,7 +218,6 @@ module = [
     # tests/
 #    "tests.conftest",
     "tests.test_addnodes",
-    "tests.test_application",
     "tests.test_errors",
     "tests.test_events",
     "tests.test_highlighting",
diff --git a/tests/test_application.py b/tests/test_application.py
index a0fe268fe..e39998663 100644
--- a/tests/test_application.py
+++ b/tests/test_application.py
@@ -1,9 +1,11 @@
 """Test the Sphinx class."""
+from __future__ import annotations
 
 import shutil
 import sys
 from io import StringIO
 from pathlib import Path
+from typing import TYPE_CHECKING
 from unittest.mock import Mock
 
 import pytest
@@ -14,8 +16,15 @@ from sphinx.errors import ExtensionError
 from sphinx.testing.util import SphinxTestApp, strip_escseq
 from sphinx.util import logging
 
+if TYPE_CHECKING:
+    import os
 
-def test_instantiation(tmp_path_factory, rootdir: str, monkeypatch):
+
+def test_instantiation(
+    tmp_path_factory: pytest.TempPathFactory,
+    rootdir: str | os.PathLike[str] | None,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
     # Given
     src_dir = tmp_path_factory.getbasetemp() / 'root'