Add tests for CashShopSurpriseHandler

src/main/java/net/packet/ByteBufInPacket.java

@@ -82,6 +82,11 @@ public class ByteBufInPacket implements InPacket {
         return byteBuf.readerIndex();
     }
 
+    @Override
+    public boolean equals(Object o) {
+        return o instanceof ByteBufInPacket other && byteBuf.equals(other.byteBuf);
+    }
+
     @Override
     public String toString() {
         final int readerIndex = byteBuf.readerIndex();