BDD with SubSpec and XUnit NullReferenceException - bdd

Question

Fairly new to TDD; want to give BDD a try first. I'm using an MVP UI Presentation Pattern Framework and I'm trying to write my first test using SubSpec and XUnit but I'm getting a NullReferenceException from my presenter when I make a call to the repo.
I'm sure the answer is obvious, but its got me. Also, it appears that my test is concerned more with the details of the Presentation Pattern -- I trust that it works and probably doesn't need to be tested like below (i.e. raising the view.load event) but I could'nt think of another way. Any suggestions for a better test are welcomed.
My Unit Test:
[Specification]
public void ViewLoad_WhenTheView.LoadEventIsRaised_ViewLoadShouldGetAll()
{
var view = MockRepository.GenerateMock<IOpenJobsView>();
var repository = MockRepository.GenerateMock<IOpenJobsRepository>();
var model = new OpenJobsModel().OpenJobs;
var openJobs = new List<OpenJob>();
var jobsFromModel = view.Stub(v => v.Model.OpenJobs).Return(model);
var jobsFromRepo = repository.Stub(r => r.GetAll()).Return(openJobs);
var presenter = default(OpenJobsPresenter);
"Given an openJobsPresenter"
.Context(() => presenter = new OpenJobsPresenter(view, repository));
"when the view loads"
.Do(() => view.Raise(v => v.Load += presenter.ViewLoad, view, new EventArgs()));
"the object subscribed to the event should result in a call to GetAll"
.Assert(() => repository.AssertWasCalled(o => o.GetAll()));
"the results from the call to GetAll should be equal to the model"
.Assert(() => Assert.Equal(jobsFromModel, jobsFromRepo));
My Presenter:
public class OpenJobsPresenter : Presenter<IOpenJobsView>
{
readonly IOpenJobsRepository openJobsRepository;
public OpenJobsPresenter(IOpenJobsView view, IOpenJobsRepository openJobsRepository) : base(view)
{
this.openJobsRepository = openJobsRepository;
View.Load += ViewLoad;
}
public void ViewLoad(object sender, System.EventArgs e)
{
View.Model.OpenJobs = openJobsRepository.GetAll(); //Getting NullReferenceException here
}
}

Answer 1

Ok. I was able to figure this out. The null reference was due to the model not being initialized by the view. So I stubbed out the model on the view -- that did it.
I cleaned up my test and included it along with the system under test for a complete solution.
Unit Test:
public class OpenJobsPresenterTests
{
readonly OpenJobsModel _model;
readonly IOpenJobsView _view;
readonly IOpenJobsRepository _repo;
public OpenJobsPresenterTests()
{
_model = MockRepository.GenerateMock<OpenJobsModel>();
_view = MockRepository.GenerateMock<IOpenJobsView>();
_repo = MockRepository.GenerateMock<IOpenJobsRepository>();
}
[Specification]
public void OpenJobsPresenterShouldGetAllOpenJobsOnViewLoad()
{
var presenter = default(OpenJobsPresenter);
var openJobs = new List<OpenJob>();
_view.Stub(v => v.Model).Return(_model);
_repo.Stub(d => d.GetAll()).Return(openJobs);
"Given the OpenJobsPresenter"
.Context(() => presenter = new OpenJobsPresenter(_view, _repo));
"when the view's load event is raised"
.Do(() => _view.Raise(d => d.Load += presenter.OnViewLoad, _view, new EventArgs()));
"the event subscriber should get all open jobs"
.Assert(() => _repo.AssertWasCalled(r => r.GetAll()));
"the model should equal the results returned"
.Assert(() => _view.Model.OpenJobs.ShouldBe(openJobs));
}
}
SUT:
public class OpenJobsPresenter : Presenter<IOpenJobsView>
{
readonly IOpenJobsRepository openJobsRepository;
public OpenJobsPresenter(IOpenJobsView view, IOpenJobsRepository openJobsRepository) : base(view)
{
this.openJobsRepository = openJobsRepository;
View.Load += OnViewLoad;
}
public void OnViewLoad(object sender, System.EventArgs e)
{
View.Model.OpenJobs = openJobsRepository.GetAll();
}
}