public class FrontEndTestController : Controller
{
    private IFrontEndTestRepository frontEndTestRepository;

    public FrontEndTestController(IFrontEndTestRepository frontEndTestRepository)
    {
        this.frontEndTestRepository = frontEndTestRepository;
    }
    public ViewResult GetFrontEndTestView()
    {
        var dataSourceId = RenderingContext.Current?.Rendering?.DataSource;
        var viewModel =
            dataSourceId != null
            ? frontEndTestRepository.GetFrontEndTestModel(dataSourceId)
            : new FrontEndTest();

        return View("FrontEndTest", viewModel);
    }
}