When_Rendering_Entity_Details.cs

[TestFixture]
public class When_Rendering_Entity_Details : InteractionContext<RenderEntityDetailsAction<Vendor, VendorRequestModel, VendorDetailsModel>>
{
    private VendorRequestModel _requestModel;
    protected override void BeforeEach()
    {
        _requestModel = new VendorRequestModel {VendorId = 1};
    }

    [Test]
    public void An_Entity_Not_Found_Exception_Is_Thrown_If_The_Entity_Cannot_Be_Found()
    {
        MockFor<IEntityService>()
            .Expect(s => s.Get<Vendor>(_requestModel))
            .Return(null);

        Exception<EntityNotFoundException<Vendor>>
            .ShouldBeThrownBy(() => ClassUnderTest.Get(_requestModel));
    }

    [Test]
    public void Entity_Is_Mapped_To_Details_Model_When_Found()
    {
        var vendor = Vendor
                        .CreateNew()
                        .WithVendorName("Test Vendor")
                        .WithAccountNumber("1234")
                        .WithVendorCode("TV")
                        .Build();

        MockFor<IEntityService>()
            .Expect(s => s.Get<Vendor>(_requestModel))
            .Return(vendor);

        var detailsModel = new VendorDetailsModel();
        MockFor<IMappingRegistry>()
            .Expect(r => r.Map<Vendor, VendorDetailsModel>(vendor))
            .Return(detailsModel);

        ClassUnderTest.Get(_requestModel).ShouldBeTheSameAs(detailsModel);
    }
}