{
  "name": "verify-set-fields-errors-string",
  "nodes": [
    {"id": "n1", "name": "Trigger", "type": "click-trigger", "position": {"x": 0, "y": 0}, "config": {}},
    {"id": "n2", "name": "StringFixture", "type": "code", "position": {"x": 0, "y": 100},
     "config": {"code": "return 'just a string';"}},
    {"id": "n3", "name": "SetOnString", "type": "set-fields", "position": {"x": 0, "y": 200},
     "config": {
       "mode": "keep-all",
       "fields": [
         {"name": "label", "value": "hello"}
       ]
     }}
  ],
  "connections": [
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "n2", "targetInput": "data"},
    {"sourceNodeId": "n2", "sourceOutput": "result", "targetNodeId": "n3", "targetInput": "data"}
  ],
  "expect": {
    "n3": {"status": "failed", "errorContains": "keep-all needs an object input"}
  }
}