internal static TController ControllerAs <TController>(this ControllerTestContext controllerTestContext)
     where TController : class => controllerTestContext.Controller as TController;
 public static ViewDataDictionary GetViewData(this ControllerTestContext controllerTestContext)
 => controllerTestContext.ControllerAs <Controller>()?.ViewData
 ?? ViewFeaturesControllerPropertyHelper
 .GetViewFeatureProperties(controllerTestContext.Controller.GetType())
 .ViewDataGetter(controllerTestContext.Controller);