[
  {
    "row_id": "cup-001",
    "statusCode": 200,
    "body": {
      "data": [
        {
          "b64_json": "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVR4nGMIqFgFAAKOAXOSFUphAAAAAElFTkSuQmCC"
        }
      ]
    },
    "fixture_only": true,
    "note": "Synthetic local 1x1 PNG, not an API result"
  },
  {
    "row_id": "bad-002",
    "statusCode": 400,
    "body": {
      "error": {
        "message": "Synthetic unsupported parameter error"
      }
    },
    "fixture_only": true
  },
  {
    "row_id": "empty-003",
    "statusCode": 200,
    "body": {
      "text": "Synthetic text-only response"
    },
    "fixture_only": true
  }
]