Question

I am using Moq to mock my Repository layer so I can unit test.

My repository layer Insert methods update the Id property of my entities when a successful db insert occurs.

How do I configure moq to update the Id property of the entity when the Insert method is called?

Repository code:-

void IAccountRepository.InsertAccount(AccountEntity account); 

Unit Test:-

[TestInitialize()] public void MyTestInitialize()  {     accountRepository = new Mock<IAccountRepository>();     contactRepository = new Mock<IContactRepository>();     contractRepository = new Mock<IContractRepository>();     planRepository = new Mock<IPlanRepository>();     generator = new Mock<NumberGenerator>();      service = new ContractService(contractRepository.Object, accountRepository.Object,                      planRepository.Object, contactRepository.Object, generator.Object);    }   [TestMethod] public void SubmitNewContractTest() {     // Setup Mock Objects     planRepository         .Expect(p => p.GetPlan(1))         .Returns(new PlanEntity() { Id = 1 });      generator         .Expect(p => p.GenerateAccountNumber())         .Returns('AC0001');      // Not sure what to do here?      // How to mock updating the Id field for Inserts?     //                                                      // Creates a correctly populated NewContractRequest instance     NewContractRequest request = CreateNewContractRequestFullyPopulated();      NewContractResponse response = service.SubmitNewContract(request);     Assert.IsTrue(response.IsSuccessful); } 

implementation snippet from ContractService class (WCF service contract).

AccountEntity account = new AccountEntity() {     AccountName = request.Contact.Name,     AccountNumber = accountNumber,     BillingMethod = BillingMethod.CreditCard,     IsInvoiceRoot = true,     BillingAddressType = BillingAddressType.Postal,     ContactId = request.Contact.Id.Value };  accountRepository.InsertAccount(account); if (account.Id == null) {     // ERROR } 

I apologise if this information may be a little lacking. I only started learning moq and mocking frameworks today. ac

Answer 1

You can use the Callback method to mock side-effects. Something like:

accountRepository     .Expect(r => r.InsertAccount(account))     .Callback(() => account.ID = 1); 

That’s untested but it’s along the right lines.