public void Message_KeepaliveMessage()
{
Guid srcAddr = Guid.NewGuid();
Guid dstAddr = Guid.NewGuid();
IMessage msg =
new KeepaliveMessage(srcAddr, dstAddr);
Assert.AreEqual(srcAddr, new Guid(msg.GetSourceAddressBytes()));
Assert.AreEqual(dstAddr, new Guid(msg.GetDestinationAddressBytes()));
Assert.AreEqual("ping", msg.GetContentBytes().AsString());
}