Add note about asyncnullcontext

.pre-commit-config.yaml

@@ -48,7 +48,7 @@ repos:
       - id: no-commit-to-branch
         args: [--branch, dev, --branch, int, --branch, main]
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.7.1
+    rev: v0.7.4
     hooks:
       - id: ruff
         args: [--fix, --exit-non-zero-on-fix]

src/ghga_service_commons/utils/context.py

@@ -29,5 +29,8 @@
 async def asyncnullcontext(
     yield_value: YieldValue,
 ) -> AsyncGenerator[YieldValue, None]:
-    """Async version of contextlib.nullcontext but with a custom yield value."""
+    """Async version of contextlib.nullcontext but with a custom yield value.
+
+    Note that you can just use contextlib.nullcontext instead since Python 3.10.
+    """
     yield yield_value

tests/integration/test_mock_router.py

@@ -219,7 +219,7 @@ def fails():
     def fails_also():  # will only get passed to error if we set handle_exception_subclasses
         raise TestValueError()
 
-    httpx_mock.add_callback(callback=throwaway.handle_request)
+    httpx_mock.add_callback(callback=throwaway.handle_request, is_reusable=True)
 
     with httpx.Client(base_url=BASE_URL) as client:
         client.get("/gotohandler")

tests/unit/utils/test_context.py

@@ -16,6 +16,9 @@
 
 """Test context utils."""
 
+import sys
+from contextlib import nullcontext
+
 import pytest
 
 from ghga_service_commons.utils.context import asyncnullcontext
@@ -26,5 +29,13 @@ async def test_asyncnullcontext():
     """Test the asyncnullcontext context manager."""
     value = "test"
 
+    modern_python = sys.version_info >= (3, 10)
+
+    try:
+        async with nullcontext(value) as test:
+            assert test == value
+    except AttributeError:
+        assert not modern_python, "nullcontext should work with async"
+
     async with asyncnullcontext(value) as test:
         assert test == value