add metadata to test frames to be processed

public/app/features/explore/NodeGraph/NodeGraphContainer.test.tsx

@@ -50,6 +50,7 @@ const nodes = new MutableDataFrame({
     ['secondaryStat', ['1047.29ms (99.82%)']],
     ['color', [0.9982395121342127]],
   ]),
+  meta: { preferredVisualisationType: 'nodeGraph' },
 });
 
 function toFields(fields: Array<[string, unknown[]]>) {

public/app/plugins/panel/nodeGraph/utils.ts

@@ -433,6 +433,7 @@ function nodesFrame() {
       ...value,
       name: key,
     })),
+    meta: { preferredVisualisationType: 'nodeGraph' },
   });
 }
 
@@ -480,6 +481,7 @@ function edgesFrame() {
       ...value,
       name: key,
     })),
+    meta: { preferredVisualisationType: 'nodeGraph' },
   });
 }