add packet test: LpPacketTest

src/main/java/packet/LpPacket.java

@@ -16,6 +16,14 @@ public class LpPacket implements IEncodingAble {
     public LpPacketHeader lpPacketHeader=new LpPacketHeader();
     public Payload payload=new Payload();
 
+    public LpPacket(){
+    }
+
+    public LpPacket(LpPacketHeader lpPacketHeader,Payload payload){
+        this.lpPacketHeader=lpPacketHeader;
+        this.payload=payload;
+    }
+
     /**
      * 将 LpPacket 线速编码为一个 TLV
      * @param encoder