public async void ByName_Not_Exists() { var mock = new ServiceMockFacade <IProductModelRepository>(); mock.RepositoryMock.Setup(x => x.ByName(It.IsAny <string>())).Returns(Task.FromResult <ProductModel>(null)); 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); ApiProductModelResponseModel response = await service.ByName(default(string)); response.Should().BeNull(); mock.RepositoryMock.Verify(x => x.ByName(It.IsAny <string>())); }