More async detection tests

Signed-off-by: Sergio Herrera <627709+seherv@users.noreply.github.com>

Author: seherv

ext/dapr-ext-workflow/tests/test_async_activity_registration.py

@@ -236,6 +236,27 @@ def __call__(self, ctx: object, inp: object) -> str:
 
         self.assertFalse(_is_async_callable(SyncCallable()))
 
+    def test_cyclic_wrapped_chain_does_not_crash(self) -> None:
+        """A self-referential ``__wrapped__`` makes ``inspect.unwrap`` raise; detection must
+        fall back to the outermost callable instead of propagating the error."""
+
+        async def async_cyclic() -> None: ...
+
+        async_cyclic.__wrapped__ = async_cyclic  # type: ignore[attr-defined]
+
+        def sync_cyclic() -> None: ...
+
+        sync_cyclic.__wrapped__ = sync_cyclic  # type: ignore[attr-defined]
+
+        self.assertTrue(_is_async_callable(async_cyclic))
+        self.assertFalse(_is_async_callable(sync_cyclic))
+
+    def test_non_callable_input_is_not_async(self) -> None:
+        """The worker passes ``None`` for an unregistered activity and relies on a False
+        result to route to the sync handler."""
+        self.assertFalse(_is_async_callable(None))
+        self.assertFalse(_is_async_callable(42))
+
 
 class AsyncAndSyncCoexistTest(_AsyncActivityRegistrationTestBase):
     def test_runtime_registers_mixed_sync_and_async_activities(self) -> None: