diff --git a/src/visr/stubs/test_stub.py b/src/visr/stubs/test_stub.py
new file mode 100644
index 0000000..cf38101
--- /dev/null
+++ b/src/visr/stubs/test_stub.py
@@ -0,0 +1,5 @@
+
+from dodal.common import MsgGenerator, inject
+
+def test_stub() -> MsgGenerator:
+    yield from {}