diff --git a/web/gui/src/test/_karma/ev/linkupdate/ev_1_addInstance.json b/web/gui/src/test/_karma/ev/linkupdate/ev_1_addInstance.json
new file mode 100644
index 0000000..33bfb80
--- /dev/null
+++ b/web/gui/src/test/_karma/ev/linkupdate/ev_1_addInstance.json
@@ -0,0 +1,14 @@
+{
+  "event": "addInstance",
+  "payload": {
+    "id": "onos",
+    "ip": "192.168.56.101",
+    "online": true,
+    "uiAttached": true,
+    "switches": 2,
+    "labels": [
+      "onos",
+      "192.168.56.101"
+    ]
+  }
+}