update test graph

test3.json

@@ -1 +1,36 @@
-{"layers": [[{"name":"n2","width":10,"height":10},{"name":"n1","width":10,"height":10,"layers": [[{"name":"n2","width":10,"height":10}]]}]],"name":"n0"}
+{
+  "layers": [
+    [
+      {
+        "width": 10,
+        "height": 10
+      },
+      {
+        "name": "n1",
+        "width": 10,
+        "height": 10,
+        "layers": [
+          [
+            {
+              "name": "n2",
+              "width": 10,
+              "height": 10
+            }
+          ]
+        ]
+      }
+    ],
+    [
+      {
+        "name": "n2"
+      }
+    ]
+  ],
+  "edges": [
+    {
+      "source": "n1",
+      "target": "n2"
+    }
+  ],
+  "name": "n0"
+}