Small modifications to DeriveUnit

Fixed init inconsitencies on DeriveUnit IO queues as well as function
naming. Updated test to stream output

src/dynalab_core/derive.py

@@ -35,12 +35,11 @@ class DeriveUnit:
         return_signal: SignalDescriptor,
     ) -> None:
         self._id: UUID = unit_uuid
-        self._worker_thread: Thread | None = None
         self._process_function: Callable = processing_function
         self._return_signal: SignalDescriptor = return_signal
         self._stop_event: threading.Event = threading.Event()
-        self._input_queue: Queue[list[ValueDescriptor]] = []
-        self._output_queue: Queue[ValueDescriptor] = []
+        self._input_queue: Queue[list[ValueDescriptor]] = Queue()
+        self._output_queue: Queue[ValueDescriptor] = Queue()
 
         self._num_input_args: int = 0
         self._parser_state: int = ParserState.INIT
@@ -66,10 +65,12 @@ class DeriveUnit:
         if sig.return_annotation is not ValueDescriptor:
             raise DeriveUnitInvalidSignatureError
 
-        print(f"Signature validated with {self._num_input_args} input values")
-        # TODO: Define and start worker thread
+        self._worker_thread: Thread = Thread(
+            target=self._worker_function, name=f"{self._id}_worker_thread", daemon=True
+        )
+        self._worker_thread.start()
 
-    def worker_function(self) -> None:
+    def _worker_function(self) -> None:
         while not self._stop_event.is_set():
             try:
                 input_args = self._input_queue.get(timeout=0.1)