{
  "fixture": "BACnet Signed Unsigned",
  "cases": [
    {
      "case_id": "无符号255",
      "kind": "正例",
      "result": {
        "type": "Unsigned",
        "value": 255,
        "bytes": 1
      }
    },
    {
      "case_id": "有符号负1",
      "kind": "正例",
      "result": {
        "type": "Signed",
        "value": -1,
        "bytes": 1
      }
    },
    {
      "case_id": "负300",
      "kind": "正例",
      "result": {
        "type": "Signed",
        "value": -300,
        "bytes": 2
      }
    },
    {
      "case_id": "三字节正数",
      "kind": "正例",
      "result": {
        "type": "Unsigned",
        "value": 65536,
        "bytes": 3
      }
    },
    {
      "case_id": "负载不足",
      "kind": "显式负例",
      "rejected": "整数长度不匹配"
    }
  ],
  "assertions_passed": 5,
  "scope": "合成输入离线演算；未接真实设备"
}