public async void ByCatalogDescription_Not_Exists() { var mock = new ServiceMockFacade <IProductModelRepository>(); mock.RepositoryMock.Setup(x => x.ByCatalogDescription(It.IsAny <string>(), It.IsAny <int>(), It.IsAny <int>())).Returns(Task.FromResult <List <ProductModel> >(new List <ProductModel>())); var service = new ProductModelService(mock.LoggerMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.ProductModelModelValidatorMock.Object, mock.BOLMapperMockFactory.BOLProductModelMapperMock, mock.DALMapperMockFactory.DALProductModelMapperMock, mock.BOLMapperMockFactory.BOLProductMapperMock, mock.DALMapperMockFactory.DALProductMapperMock, mock.BOLMapperMockFactory.BOLProductModelProductDescriptionCultureMapperMock, mock.DALMapperMockFactory.DALProductModelProductDescriptionCultureMapperMock); List <ApiProductModelResponseModel> response = await service.ByCatalogDescription(default(string)); response.Should().BeEmpty(); mock.RepositoryMock.Verify(x => x.ByCatalogDescription(It.IsAny <string>(), It.IsAny <int>(), It.IsAny <int>())); }