public async void BySalesPersonID_Not_Exists() { var mock = new ServiceMockFacade <IStoreRepository>(); mock.RepositoryMock.Setup(x => x.BySalesPersonID(It.IsAny <int?>())).Returns(Task.FromResult <List <Store> >(new List <Store>())); var service = new StoreService(mock.LoggerMock.Object, mock.RepositoryMock.Object, mock.ModelValidatorMockFactory.StoreModelValidatorMock.Object, mock.BOLMapperMockFactory.BOLStoreMapperMock, mock.DALMapperMockFactory.DALStoreMapperMock, mock.BOLMapperMockFactory.BOLCustomerMapperMock, mock.DALMapperMockFactory.DALCustomerMapperMock); List <ApiStoreResponseModel> response = await service.BySalesPersonID(default(int?)); response.Should().BeEmpty(); mock.RepositoryMock.Verify(x => x.BySalesPersonID(It.IsAny <int?>())); }