public SettingsViewModel(ISettingsHandler settingsHandler, IDisplayHandler displayHandler, IOpenFileDialog openFileDialog)
{
_settingsHandler = settingsHandler ?? throw new ArgumentException("Parameter cannot be null", nameof(settingsHandler));
_displayHandler = displayHandler ?? throw new ArgumentException("Parameter cannot be null", nameof(displayHandler));
_openFileDialog = openFileDialog ?? throw new ArgumentException("Parameter cannot be null", nameof(openFileDialog));
_checkInterval = settingsHandler.GetCheckInterval();
_autoStart = settingsHandler.GetAutoStart();
_attachLastFileFromLocation = settingsHandler.GetAttachLastFileFromLocation();
_lastFileToAttachLocation = settingsHandler.GetLastFileToAttachLocation();
var displays = _displayHandler.Get().Select(d => new DisplayViewModel(d, SaveDisplaySettings));
_displays = new ObservableCollection <DisplayViewModel>(displays);
_isExpanded = settingsHandler.GetSettingsIsExpanded();
}