added mock test for interface

tests/service/test_interface.py

@@ -1,10 +1,13 @@
 import uuid
 from dataclasses import dataclass
-from unittest.mock import MagicMock, patch
+from unittest.mock import MagicMock, Mock, patch
 
 import pytest
+from bluesky_stomp.messaging import MessagingTemplate
 from ophyd.sim import SynAxis
+from stomp.connect import StompConnection11 as Connection
 
+from blueapi.config import ApplicationConfig, StompConfig
 from blueapi.core import MsgGenerator
 from blueapi.core.context import BlueskyContext
 from blueapi.service import interface
@@ -14,6 +17,16 @@
 from blueapi.worker.task_worker import TrackableTask
 
 
+@pytest.fixture
+def mock_connection() -> Mock:
+    return Mock(spec=Connection)
+
+
+@pytest.fixture
+def template(mock_connection: Mock) -> MessagingTemplate:
+    return MessagingTemplate(conn=mock_connection)
+
+
 @pytest.fixture(autouse=True)
 def ensure_worker_stopped():
     """This saves every test having to call this at the end.
@@ -266,3 +279,9 @@ def test_get_task_by_id(context_mock: MagicMock):
         is_pending=True,
         errors=[],
     )
+
+
+def test_stomp_config(template: MessagingTemplate):
+    with patch("blueapi.cli.cli.MessagingTemplate.for_broker", return_value=template):
+        interface.set_config(ApplicationConfig(stomp=StompConfig()))
+        assert interface.messaging_template() is not None