{
  "fixture": "BACnet CharacterString",
  "cases": [
    {
      "case_id": "UTF8中文",
      "kind": "正例",
      "result": {
        "encoding": 0,
        "supported": true,
        "text": "前厅",
        "text_bytes": 6
      }
    },
    {
      "case_id": "ASCII",
      "kind": "正例",
      "result": {
        "encoding": 0,
        "supported": true,
        "text": "AHU-1",
        "text_bytes": 5
      }
    },
    {
      "case_id": "未支持字符集",
      "kind": "正例",
      "result": {
        "encoding": 5,
        "supported": false,
        "raw_hex": "c4e3"
      }
    },
    {
      "case_id": "UTF8非法序列",
      "kind": "显式负例",
      "rejected": "UTF8内容非法"
    }
  ],
  "assertions_passed": 4,
  "scope": "合成输入离线演算；未接真实设备"
}