public PlotViewModel(IDatapointsService datapointsService, INotificationService notificationService)
        {
            _datapointsService   = datapointsService;
            _notificationService = notificationService;

            ShowDecimals = 4;

            AvailableFittings = new ObservableCollection <string>();
            AvailableFittings.Add(LIN);
            AvailableFittings.Add(EXP);
            AvailableFittings.Add(POW);

            OpenDataSetCommand = new DelegateCommand <object>(OpenDataSet);
        }
 public BaseTest()
 {
     notificationService = new MockNotificationService();
     datapointsService   = new MockDatapointsService();
     viewModel           = new PlotViewModel(datapointsService, notificationService);
 }