{
  "fixture": "OPC UA GUID 字节序",
  "cases": [
    {
      "case_id": "GUID节点",
      "kind": "正例",
      "result": {
        "namespace": 2,
        "guid": "72962b91-fa75-4ae6-8d28-b404dc7daf63",
        "guid_wire_hex": "912b967275fae64a8d28b404dc7daf63"
      }
    },
    {
      "case_id": "顺序非对称GUID",
      "kind": "正例",
      "result": {
        "namespace": 1,
        "guid": "00112233-4455-6677-8899-aabbccddeeff",
        "guid_wire_hex": "33221100554477668899aabbccddeeff"
      }
    },
    {
      "case_id": "截短GUID",
      "kind": "显式负例",
      "rejected": "GUID NodeId应为19字节"
    }
  ],
  "assertions_passed": 3,
  "scope": "合成输入离线演算；未接真实设备"
}