{
  "name": "verify-stop-and-error",
  "nodes": [
    {"id": "n1", "name": "Trigger", "type": "click-trigger", "position": {"x": 0, "y": 0}, "config": {}},
    {"id": "n2", "name": "Stop", "type": "stop-and-error", "position": {"x": 0, "y": 100},
     "config": {"message": "deliberate stop"}},
    {"id": "n3", "name": "After", "type": "code", "position": {"x": 0, "y": 200},
     "config": {"code": "return { marker: 'should not run' };"}}
  ],
  "connections": [
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "n2", "targetInput": "data"},
    {"sourceNodeId": "n2", "sourceOutput": "main", "targetNodeId": "n3", "targetInput": "data"}
  ],
  "expect": {
    "n2": {"status": "failed", "errorContains": "deliberate stop"}
  },
  "expectMissing": ["n3"]
}