{
  "fixture": "BACnet tag header",
  "cases": [
    {
      "case_id": "短应用值",
      "kind": "正例",
      "result": {
        "tag": 2,
        "context": false,
        "kind": "value",
        "length": 1,
        "payload_hex": "2a"
      }
    },
    {
      "case_id": "扩展五字节",
      "kind": "正例",
      "result": {
        "tag": 6,
        "context": false,
        "kind": "value",
        "length": 5,
        "payload_hex": "0102030405"
      }
    },
    {
      "case_id": "扩展标签号",
      "kind": "正例",
      "result": {
        "tag": 20,
        "context": true,
        "kind": "value",
        "length": 1,
        "payload_hex": "01"
      }
    },
    {
      "case_id": "开始标签",
      "kind": "正例",
      "result": {
        "tag": 3,
        "context": true,
        "kind": "opening",
        "length": 0,
        "payload_hex": ""
      }
    },
    {
      "case_id": "结束标签",
      "kind": "正例",
      "result": {
        "tag": 3,
        "context": true,
        "kind": "closing",
        "length": 0,
        "payload_hex": ""
      }
    },
    {
      "case_id": "缺负载",
      "kind": "显式负例",
      "rejected": "负载长度不匹配"
    }
  ],
  "assertions_passed": 6,
  "scope": "合成输入离线演算；未接真实设备"
}