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   [TestFixture]
    public class When_the_selection_manager_has_its_search_results_updated2
    {
        private FakeSearchService searchService;
        private SelectionManager selectionManager;

        private const string ItemPresentInBothLists = "One";
        private const string ItemOnlyPresentInSearchResults = "Two";
        private const string AlreadySelectedItem = "Four";
        private const string UnselectedItem = "Five";

        [TestFixtureSetUp]
        public void ArrangeAndAct()
        {
            searchService = new FakeSearchServiceBuilder()
                .WithUnselectedItem(ItemPresentInBothLists)
                .WithUnselectedItem(ItemOnlyPresentInSearchResults)
                .Get();

            selectionManager = new SelectionManagerBuilder()
                .UsingSearchService(searchService)
                .WithSelectedItem(ItemPresentInBothLists)
                .WithSelectedItem(AlreadySelectedItem)
                .WithUnselectedItem(UnselectedItem)
                .Get();

            selectionManager.PerformAdditionalSearch("searchTerm");
        }

        [Test]
        public void Items_which_are_selected_in_both_lists_are_selected_in_the_merged_output()
        {
            Assert.That(selectionManager.HasSelectedItemWithId(ItemPresentInBothLists));
        }

        [Test]
        public void Items_only_present_in_the_search_results_appear_unselected_in_the_merged_output()
        {
            Assert.That(selectionManager.HasUnselectedItemWithId(ItemOnlyPresentInSearchResults));
        }

        [Test]
        public void Items_which_are_selected_in_the_current_list_without_being_present_in_the_returned_list_are_kept_selected_in_the_current_list()
        {
            Assert.That(selectionManager.HasSelectedItemWithId(AlreadySelectedItem));
        }

        [Test]
        public void Items_which_are_not_selected_in_the_current_list_without_being_present_in_the_returned_list_are_removed_from_the_current_list()
        {
            Assert.That(selectionManager.DoesNotHaveItemWithId(UnselectedItem));
        }
    }