test: added not overridden reciever base test

test/unit/test_reciever_base.py

@@ -0,0 +1,19 @@
+import pytest
+from robot_interface.endpoints.receiver_base import ReceiverBase
+
+
+def test_receiver_base_not_implemented(monkeypatch):
+    """
+    Ensure that the base ReceiverBase raises NotImplementedError when
+    handle_message is called on a subclass that does not implement it.
+    """
+    # Patch the __abstractmethods__ to allow instantiation
+    monkeypatch.setattr(ReceiverBase, "__abstractmethods__", frozenset())
+
+    class DummyReceiver(ReceiverBase):
+        pass
+
+    dummy = DummyReceiver("dummy")  # Can now instantiate
+
+    with pytest.raises(NotImplementedError):
+        dummy.handle_message({"endpoint": "dummy", "data": None})