unit test with lambda fail using rhino mock

Question

If I have this test

Expect.Call(_session.Single<Admin>(x => x.Email == userModel.Email)).Repeat.Once().Return(null);

Telling me

Rhino.Mocks.Exceptions.ExpectationViolationException : ISession.Single(x => (x.Email == value(Enquete.Test.Controllers.MemberControllerTest+<>c__DisplayClassb).userModel.Email)); Expected #1, Actual #0.

It fails but if I add .IgnoreArguments() it works. Is it possible to test using lambda? If I debug I can see that my Email is the same.

Here's the full test :

[Test]
        public void Register_Post_ReturnRedirectOnSuccess()
        {
            _builder.InitializeController(_controller);

            var userModel = TestHelper.CreateMemberModel();
            var returnMemberRole = "Member";
            var tempPassword = "Val1dPass";
            var member = TestHelper.CreateMember(userModel);
            var emailSubscription = "subscription@corpiq.com";
            var subjectNotification = "sujet du meessaaggee";
            var mailUseSSL = "true";
            var message = userModel.FirstName + " " + userModel.LastName + " s'est inscrit au système d'enquête en ligne, veuillez confirmer son inscription.";
            member.PasswordExpire = DateTime.Now.AddDays(-1);
            member.Phone = userModel.Phone;
            member.MemberNumber = userModel.MemberNumber;
            member.PasswordExpire = DateTime.Now.AddDays(-1);

            Expect.Call(_session.Single<Admin>(x => x.Email == userModel.Email)).Repeat.Once().Return(null);
            Expect.Call(_session.Single<Member>(x => x.Email == userModel.Email)).Repeat.Once().IgnoreArguments().Return(null);
            Expect.Call(_authService.GeneratePassword()).Repeat.Once().Return(tempPassword);
            Expect.Call(_authService.MemberRole).Repeat.Once().Return(returnMemberRole);
            Expect.Call(_authService.RegisterUser(userModel.Email, tempPassword, returnMemberRole)).Repeat.Once().Return(MembershipCreateStatus.Success);
            _session.Add(member);
            LastCall.Repeat.Once();
            _session.CommitChanges();
            LastCall.Repeat.Once();
            Expect.Call(_configHelper.GetValue("emailSubscription")).Repeat.Once().Return(emailSubscription);
            Expect.Call(_configHelper.GetValue("subjectNotification")).Repeat.Once().Return(subjectNotification);
            Expect.Call(_configHelper.GetValue("MailUseSSL")).Repeat.Once().Return(mailUseSSL);
            _mailHelper.SendMail(emailSubscription, subjectNotification, message, Convert.ToBoolean(mailUseSSL));
            LastCall.Repeat.Once();

            _mock.ReplayAll();
            var result = _controller.Register(userModel);

            _mock.VerifyAll();
            result.AssertActionRedirect().ToAction<MemberController>(c => c.RegisterSuccess());

        }

Thank you!

Answer 1

The lambda in your unit test compiles into a class-level method (a method inside your unit test). Inside your controller, a different lambda compiles into a class-level method (inside the controller). Two different methods are used so Rhino Mocks shows the expectation error. More here: http://groups.google.com/group/rhinomocks/browse_frm/thread/a33b165c16fc48ee?tvc=1