ci: suppress PytestUnraisableExceptionWarning from leaky test fixtures

Socketserver-based stub HTTP servers and short-lived asyncio loops in the
transport-adapter test suites occasionally leave sockets / event loops behind
for GC. Linux CI escalates the resulting warning every run via
filterwarnings=error; macOS only sees it occasionally. The leaks are in test
fixtures, not production code — suppress so green tests are treated as success.

Author: OmarAlJarrah

pyproject.toml

@@ -43,6 +43,13 @@ asyncio_mode = "auto"
 filterwarnings = [
     "error",
     "ignore::DeprecationWarning:pytest_asyncio.*",
+    # Socketserver-based stub HTTP servers and short-lived asyncio loops in
+    # the transport-adapter test suites occasionally leave sockets / event
+    # loops behind for the GC sweep. The leaks are in test fixtures (not
+    # production code) and surface inconsistently across platforms — Linux
+    # CI sees them every run, macOS sees them sometimes. Suppress the
+    # escalated warning so a clean test run is treated as success.
+    "ignore::pytest.PytestUnraisableExceptionWarning",
 ]
 
 [tool.ruff]