tasks: return result of task after finishing gracefully

Tasks that finished gracefully were restarted again. This fixes that.

src/pydase/task/task.py

@@ -169,7 +169,7 @@ class Task(pydase.data_service.data_service.DataService, Generic[R]):
 
         while True:
             try:
-                await self._func()
+                return await self._func()
             except asyncio.CancelledError:
                 logger.info("Task '%s' was cancelled", self._func_name)
                 raise

tests/task/test_task.py

@@ -436,3 +436,24 @@ async def test_exit_on_failure_exceeding_rate_limit(
     await asyncio.sleep(0.5)
     assert "os.kill called with signal=" in caplog.text
     assert "Task 'my_task' encountered an exception" in caplog.text
+
+
+@pytest.mark.asyncio(scope="function")
+async def test_gracefully_finishing_task(
+    monkeypatch: pytest.MonkeyPatch, caplog: LogCaptureFixture
+) -> None:
+    class MyService(pydase.DataService):
+        @task()
+        async def my_task(self) -> None:
+            print("Hello")
+            await asyncio.sleep(0.1)
+
+    service_instance = MyService()
+    state_manager = StateManager(service_instance)
+    DataServiceObserver(state_manager)
+    service_instance.my_task.start()
+
+    await asyncio.sleep(0.05)
+    assert service_instance.my_task.status == TaskStatus.RUNNING
+    await asyncio.sleep(0.1)
+    assert service_instance.my_task.status == TaskStatus.NOT_RUNNING