New NME test

tests/validation/config.json

@@ -5,7 +5,13 @@
             "title": "Black and White post-process",
             "playgroundId": "#N55Q2M#0",
             "referenceImage": "bwpp.png"
-        },       
+        },             
+        {
+            "title": "Node material #0",
+            "playgroundId": "#M5VQE9#13",
+            "referenceImage": "node-material0.png",
+            "renderCount": 200
+        },    
         {
             "title": "Node material #1",
             "playgroundId": "#QJ71C6#0",