public async Task Send_Group_Chat_Message_With_Auto_Id_Test()
{
var mock = new Mock <IStanzaSender>();
XmppXElement result = null;
mock.Setup(s => s.SendAsync(It.IsAny <XmppXElement>()))
.Callback <XmppXElement>((el) => result = el)
.Returns(Task.CompletedTask);
await mock.Object.SendGroupChatMessageAsync(new Jid("*****@*****.**"), "hello world", true);
result.Cast <Message>().Id.ShouldNotBeNull();
result.Cast <Message>().Id.Length.ShouldBeGreaterThan(1);
}