Add tests for _compat.py

Author: gnir-work

tests/test_compat.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+import asyncio
+from asyncio import AbstractEventLoop
+
+import pytest
+
+from tests.custom_loop_utils import CustomLoop, custom_loop_factory
+from tests.utils import get_asyncio_default_loop_per_os
+from uvicorn._compat import asyncio_run
+
+
+async def assert_event_loop(expected_loop_class: type[AbstractEventLoop]):
+    assert isinstance(asyncio.get_event_loop(), expected_loop_class)
+
+
+def test_asyncio_run__default_loop_factory() -> None:
+    asyncio_run(assert_event_loop(get_asyncio_default_loop_per_os()), loop_factory=None)
+
+
+def test_asyncio_run__custom_loop_factory() -> None:
+    asyncio_run(assert_event_loop(CustomLoop), loop_factory=custom_loop_factory(use_subprocess=False))
+
+
+def test_asyncio_run__passing_a_non_awaitable_callback_should_throw_error() -> None:
+    with pytest.raises(ValueError):
+        asyncio_run(
+            lambda: None,  # type: ignore
+            loop_factory=custom_loop_factory(use_subprocess=False),
+        )