fix: resolve Python 3.11 test hang + add CI safety nets

.github/workflows/test.yml

@@ -8,6 +8,7 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    timeout-minutes: 10
     strategy:
       matrix:
         python-version: ["3.11", "3.12", "3.13"]
@@ -20,4 +21,4 @@ jobs:
       - run: ruff check src/ tests/
       - run: ruff format --check src/ tests/
       - run: mypy src/
-      - run: pytest
+      - run: pytest -v --timeout=30

pyproject.toml

@@ -49,6 +49,7 @@ dev = [
     "pytest-httpx>=0.34",
     "pytest-xdist>=3.0",
     "pytest-cov>=5.0",
+    "pytest-timeout>=2.3",
     "ruff>=0.8",
     "mypy>=1.13",
     "mypy-protobuf>=3.6",
@@ -88,6 +89,7 @@ plugins = ["pydantic.mypy"]
 testpaths = ["tests"]
 asyncio_mode = "auto"
 addopts = "-n auto -m 'not e2e'"
+timeout = 30
 markers = [
     "e2e: End-to-end smoke tests against the live Tesla Fleet API (requires TESLA_ACCESS_TOKEN)",
 ]

tests/telemetry/test_tui.py

@@ -310,14 +310,15 @@ async def test_unknown_field_goes_to_diagnostics(self) -> None:
 
     @pytest.mark.asyncio
     async def test_queue_overflow_drops_silently(self) -> None:
+        # Test the overflow behavior directly without Textual's run_test(),
+        # which deadlocks on Python 3.11 due to ContextVar + event loop
+        # scheduling differences between 3.11 and 3.12+.
         app = TelemetryTUI(vin=VIN)
-        async with app.run_test():
-            # Fill the queue.
-            for i in range(110):
-                await app.push_frame(_frame(("BatteryLevel", 8, 80 - i, "int")))
+        for i in range(110):
+            await app.push_frame(_frame(("BatteryLevel", 8, 80 - i, "int")))
 
-            # No exception should be raised — overflow is silent.
-            assert app._queue.qsize() <= 100
+        # No exception should be raised — overflow is silent.
+        assert app._queue.qsize() <= 100
 
     @pytest.mark.asyncio
     async def test_server_info_setters(self) -> None: