void Given(MessageAccepted e)
{
var sb = new StringBuilder();
sb.Append(e.UserId);
sb.Append(": ");
sb.Append(e.Message);
Messages.Add(sb.ToString());
}
protected virtual void OnMessageAccepted(object source)
{
MessageAccepted?.Invoke(source, EventArgs.Empty);
}
static Id Route(MessageAccepted e) => e.LobbyId;