{
  "fixture": "KNX DPT9 浮点解析",
  "cases": [
    {
      "case_id": "25度",
      "kind": "正例",
      "result": {
        "sign": 0,
        "exponent": 1,
        "mantissa": 1250,
        "value": 25.0,
        "quantum": 0.02
      }
    },
    {
      "case_id": "负5度",
      "kind": "正例",
      "result": {
        "sign": 1,
        "exponent": 0,
        "mantissa": -500,
        "value": -5.0,
        "quantum": 0.01
      }
    },
    {
      "case_id": "指数台阶",
      "kind": "正例",
      "result": {
        "sign": 0,
        "exponent": 2,
        "mantissa": 1,
        "value": 0.04,
        "quantum": 0.04
      }
    },
    {
      "case_id": "长度错",
      "kind": "显式负例",
      "rejected": "DPT9必须两字节"
    }
  ],
  "assertions_passed": 4,
  "scope": "合成输入离线演算；未接真实设备"
}