public async void Customers_Not_Exists() { var mock = new ServiceMockFacade <IStoreRepository>(); mock.RepositoryMock.Setup(x => x.Customers(default(int), It.IsAny <int>(), It.IsAny <int>())).Returns(Task.FromResult <List <Customer> >(new List <Customer>())); 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 <ApiCustomerResponseModel> response = await service.Customers(default(int)); response.Should().BeEmpty(); mock.RepositoryMock.Verify(x => x.Customers(default(int), It.IsAny <int>(), It.IsAny <int>())); }