public void PaymentRepository_Delete() { var accountRepositorySetup = new Mock<IAccountRepository>(); accountRepositorySetup.SetupGet(x => x.Data).Returns(new ObservableCollection<Account>()); var categoryDataAccessSetup = new Mock<IRepository<Category>>(); categoryDataAccessSetup.SetupGet(x => x.Data).Returns(new ObservableCollection<Category>()); var paymentDataAccessMock = new PaymentDataAccessMock(); var repository = new PaymentRepository(new PaymentDataAccessMock(), new RecurringPaymentDataAccessMock(), accountRepositorySetup.Object, categoryDataAccessSetup.Object); var account = new Account { Id = 2, Name = "TestAccount" }; var payment = new Payment { ChargedAccount = account, ChargedAccountId = 2, Amount = 20 }; repository.Save(payment); Assert.AreSame(payment, repository.Data[0]); repository.Delete(payment); Assert.IsFalse(repository.Data.Any()); }