public void PeerExchangeMessageDecode_Empty()
        {
            var data    = new BEncodedDictionary().Encode();
            var message = new PeerExchangeMessage();

            message.Decode(data.AsSpan());
            Assert.IsTrue(message.Added.IsEmpty, "#1");
            Assert.IsTrue(message.AddedDotF.IsEmpty, "#2");
            Assert.IsTrue(message.Dropped.IsEmpty, "#3");
        }