{
  "name": "verify-set-fields",
  "nodes": [
    {"id": "n1", "name": "Trigger", "type": "click-trigger", "position": {"x": 0, "y": 0}, "config": {}},
    {"id": "n2", "name": "Fixture", "type": "code", "position": {"x": 0, "y": 100},
     "config": {"code": "return { total: 42, junk: 'drop me', keep: 'kept' };"}},
    {"id": "n3", "name": "Set", "type": "set-fields", "position": {"x": 0, "y": 200},
     "config": {
       "mode": "keep-all",
       "fields": [
         {"name": "label", "value": "hello"},
         {"name": "amount", "value": "{{data.result.total}}"},
         {"name": "user.city", "value": "Budapest"}
       ],
       "dropFields": ["result.junk"]
     }}
  ],
  "connections": [
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "n2", "targetInput": "data"},
    {"sourceNodeId": "n2", "sourceOutput": "main", "targetNodeId": "n3", "targetInput": "data"}
  ],
  "expect": {
    "n3": {"status": "completed", "output": {
      "label": "hello",
      "amount": 42,
      "user": {"city": "Budapest"},
      "result": {"keep": "kept"}
    }}
  }
}