public void AcceptInvitationToLobby_LobbyInInvitedToLobbies_ProperFunctionsCalled()
{
MyWork.DidNotReceive().Complete();
var lobby = Substitute.For <Lobby>();
var user = new User();
lobby.DidNotReceive().AcceptLobby(Arg.Any <User>());
LobbyRepository.Get(Arg.Any <long>()).Returns(lobby);
MyWork.User.Get(Arg.Any <string>()).Returns(user);
uut.Accept(1);
lobby.Received(1).AcceptLobby(Arg.Any <User>());
MyWork.Received(1).Complete();
}