Fix warnings from new pytest-asyncio

The new pytest-asyncio requires some new configuration and new
ways of marking fixtures.

pyproject.toml

@@ -93,3 +93,10 @@ include_trailing_comma = true
 multi_line_output = 3
 known_first_party = ["nublado2", "tests"]
 skip = ["docs/conf.py"]
+
+[tool.pytest.ini_options]
+asyncio_mode = "strict"
+python_files = [
+    "tests/*.py",
+    "tests/*/*.py"
+]

tests/auth_test.py

@@ -7,10 +7,11 @@
 
 from __future__ import annotations
 
-from typing import TYPE_CHECKING
+from typing import Any, AsyncGenerator, Callable, Dict
 from unittest.mock import MagicMock, patch
 
 import pytest
+import pytest_asyncio
 from aioresponses import CallbackResult, aioresponses
 from tornado import web
 from tornado.httputil import HTTPHeaders
@@ -21,11 +22,8 @@
     _build_auth_info,
 )
 
-if TYPE_CHECKING:
-    from typing import Any, AsyncGenerator, Callable, Dict
 
-
-@pytest.fixture(autouse=True)
+@pytest_asyncio.fixture(autouse=True)
 async def config_mock() -> AsyncGenerator:
     """Use a mock NubladoConfig object."""
     with patch("nublado2.auth.NubladoConfig") as mock:

tests/provisioner_test.py

@@ -7,14 +7,15 @@
 from unittest.mock import MagicMock, Mock, patch
 
 import pytest
+import pytest_asyncio
 from aioresponses import CallbackResult, aioresponses
 from jupyterhub.spawner import Spawner
 from jupyterhub.user import User
 
 from nublado2.resourcemgr import ResourceManager
 
 
-@pytest.fixture(autouse=True)
+@pytest_asyncio.fixture(autouse=True)
 async def config_mock() -> AsyncGenerator:
     """Use a mock NubladoConfig object."""
     with patch("nublado2.resourcemgr.NubladoConfig") as mock:

tests/resourcemgr_test.py

@@ -4,7 +4,7 @@
 
 import asyncio
 import sys
-from typing import TYPE_CHECKING
+from typing import Any, Callable, Dict, Iterator, List
 from unittest.mock import Mock, patch
 
 import pytest
@@ -25,9 +25,6 @@
 from nublado2.resourcemgr import ResourceManager
 from nublado2.selectedoptions import SelectedOptions
 
-if TYPE_CHECKING:
-    from typing import Any, Callable, Dict, Iterator, List
-
 # Mock user resources template to test the template engine.
 USER_RESOURCES_TEMPLATE = """
 - apiVersion: v1