public async void ByName_Not_Exists() { var mock = new ServiceMockFacade <IProductCategoryRepository>(); mock.RepositoryMock.Setup(x => x.ByName(It.IsAny <string>())).Returns(Task.FromResult <ProductCategory>(null)); var service = new ProductCategoryService(mock.LoggerMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.ProductCategoryModelValidatorMock.Object, mock.BOLMapperMockFactory.BOLProductCategoryMapperMock, mock.DALMapperMockFactory.DALProductCategoryMapperMock, mock.BOLMapperMockFactory.BOLProductSubcategoryMapperMock, mock.DALMapperMockFactory.DALProductSubcategoryMapperMock); ApiProductCategoryResponseModel response = await service.ByName(default(string)); response.Should().BeNull(); mock.RepositoryMock.Verify(x => x.ByName(It.IsAny <string>())); }