public async void Name_Update_null()
        {
            Mock <IVProductAndDescriptionRepository> vProductAndDescriptionRepository = new Mock <IVProductAndDescriptionRepository>();

            vProductAndDescriptionRepository.Setup(x => x.Get(It.IsAny <string>())).Returns(Task.FromResult(new VProductAndDescription()));

            var validator = new ApiVProductAndDescriptionRequestModelValidator(vProductAndDescriptionRepository.Object);
            await validator.ValidateUpdateAsync(default(string), new ApiVProductAndDescriptionRequestModel());

            validator.ShouldHaveValidationErrorFor(x => x.Name, null as string);
        }