diff --git a/tests/epics/demo/test_demo.py b/tests/epics/demo/test_demo.py
index 81c4900c5f..b0a8d871bc 100644
--- a/tests/epics/demo/test_demo.py
+++ b/tests/epics/demo/test_demo.py
@@ -2,6 +2,7 @@
 from typing import Dict
 from unittest.mock import ANY, Mock, call
 
+import aioca
 import pytest
 from bluesky.protocols import Reading
 
@@ -290,3 +291,9 @@ async def test_dynamic_sensor_group_read_and_describe(
             "value": 1.0,
         },
     }
+
+
+async def test_ioc_starts():
+    pv_prefix = demo.start_ioc_subprocess()
+    pv = f"{pv_prefix}Value"
+    await aioca.connect(pv)