public void ConfirmationServiceConfirmsEmail() { //arrange var mailValidationRq = new MailValidationRequest(42, "thisistoken"); _validationRequesRepoStub.Setup(rep => rep.GetMailValidationRequest(It.IsAny <string>())) .Returns(mailValidationRq); var testAccMock = new Mock <Account>(); testAccMock.Setup(acc => acc.UserId).Returns(42); testAccMock.Setup(acc => acc.ConfirmationStatus).Returns(ConfirmationStatus.Unconfirmed); _userRepoStub.Setup(rep => rep.GetAccount(mailValidationRq.UserId)).Returns(testAccMock.Object); //act _confirmationService.ConfirmEmail(mailValidationRq.Token); //assert testAccMock.VerifySet(mock => mock.ConfirmationStatus = ConfirmationStatus.EmailConfirmed); }