diff --git a/web/gui/src/test/_karma/ev/devices/ev_4_addDevice_s3_roadm.json b/web/gui/src/test/_karma/ev/devices/ev_4_addDevice_s3_roadm.json
new file mode 100644
index 0000000..468749e
--- /dev/null
+++ b/web/gui/src/test/_karma/ev/devices/ev_4_addDevice_s3_roadm.json
@@ -0,0 +1,18 @@
+{
+  "event": "addDevice",
+  "payload": {
+    "id": "of:0000000000000003",
+    "type": "roadm",
+    "online": true,
+    "master": "ONOS",
+    "labels": [
+      "",
+      "roadm",
+      "of:0000000000000003"
+    ],
+    "metaUi": {
+      "x": 500,
+      "y": 200
+    }
+  }
+}