public void LoginIsCalled_AlreadyLoggedIn_DoesNothing()
{
//Arrange
user.UserToken = "Token";
//Act
uut.LoginCommand.Execute(null);
//Assert
Alerter.DidNotReceiveWithAnyArgs().Alert(Arg.Any <string>(), Arg.Any <string>(), Arg.Any <string>());
NavService.DidNotReceiveWithAnyArgs().GoBackAsync();
RestClient.DidNotReceiveWithAnyArgs().LoginAsync(null);
}