public void WhenRegionConstructed_SortComparisonIsDefault()
        {
            IRegion region = new Region();

            Assert.IsNotNull(region.SortComparison);
            Assert.AreEqual(region.SortComparison, Region.DefaultSortComparison);
        }

        public void WhenNavigatingWithQueryString_ViewIsActivated()
        {
            // Prepare
            object view = new object();
            Uri viewUri = new Uri(view.GetType().Name + "?MyQuery=true", UriKind.Relative);

            IRegion region = new Region();
            region.Add(view);

            string regionName = "RegionName";
            RegionManager regionManager = new RegionManager();
            regionManager.Regions.Add(regionName, region);

            var serviceLocatorMock = new Mock<IServiceLocator>();
            serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());

            IServiceLocator serviceLocator = serviceLocatorMock.Object;
            RegionNavigationContentLoader contentLoader = new RegionNavigationContentLoader(serviceLocator);
            IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;

            RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
            target.Region = region;

            // Act
            bool isNavigationSuccessful = false;
            target.RequestNavigate(viewUri, nr => isNavigationSuccessful = nr.Result == true);

            // Verify
            Assert.IsTrue(isNavigationSuccessful);
            bool isViewActive = region.ActiveViews.Contains(view);
            Assert.IsTrue(isViewActive);
        }

        public void WhenViewExistsAndDoesNotImplementINavigationAware_ThenReturnsView()
        {
            // Arrange

            var serviceLocatorMock = new Mock<IServiceLocator>();

            var region = new Region();

            var view = new TestView();

            region.Add(view);

            var navigationContext = new NavigationContext(null, new Uri(view.GetType().Name, UriKind.Relative));

            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);


            // Act

            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);


            // Assert

            Assert.AreSame(view, returnedView);
        }

        public void WhenRegionHasMultipleViews_ThenViewsWithMatchingFullTypeNameAreConsidered()
        {
            // Arrange

            var serviceLocatorMock = new Mock<IServiceLocator>();

            var region = new Region();

            var view1 = new TestView();
            var view2 = "view";

            region.Add(view1);
            region.Add(view2);

            var navigationContext = new NavigationContext(null, new Uri(view2.GetType().FullName, UriKind.Relative));

            var navigationTargetHandler = new TestRegionNavigationContentLoader(serviceLocatorMock.Object);


            // Act

            var returnedView = navigationTargetHandler.LoadContent(region, navigationContext);


            // Assert

            Assert.AreSame(view2, returnedView);
        }

        public void RemoveInexistentViewThrows()
        {
            IRegion region = new Region();
            object view = new object();

            region.Remove(view);

            Assert.AreEqual(0, region.Views.Cast<object>().Count());
        }

        public void RemoveInexistentViewThrows()
        {
            IRegion region = new Region();
            object view = new object();

            Assert.ThrowsException<ArgumentException>(() => region.Remove(view));

            Assert.AreEqual(0, region.Views.Cast<object>().Count());
        }

        public void CanAddAndRetrieveNamedViewInstance()
        {
            IRegion region = new Region();
            object myView = new object();
            region.Add(myView, "MyView");
            object returnedView = region.GetView("MyView");

            Assert.IsNotNull(returnedView);
            Assert.AreSame(returnedView, myView);
        }

        public void CanAddContentToRegion()
        {
            IRegion region = new Region();

            Assert.AreEqual(0, region.Views.Cast<object>().Count());

            region.Add(new object());

            Assert.AreEqual(1, region.Views.Cast<object>().Count());
        }

        public void CanRemoveContentFromRegion()
        {
            IRegion region = new Region();
            object view = new object();

            region.Add(view);
            region.Remove(view);

            Assert.AreEqual(0, region.Views.Cast<object>().Count());
        }

 public void LoadContent_NoPermission_InvalidOperationException()
 {
     var view = new object();
     var mockServiceLocator = new Mock<IContainer>();
     mockServiceLocator.Setup(sl => sl.Resolve<object>(It.IsAny<string>())).Returns(view);
     var mockAccessControlManager = new Mock<IAccessControlManager>();
     mockAccessControlManager.Setup(acm => acm.CanAccess(It.IsAny<ResourceRequest>())).Returns(false);
     var region = new Region();
     var secureRegionNavigationContentLoader = new SecureRegionNavigationContentLoader(mockServiceLocator.Object, mockAccessControlManager.Object);
     secureRegionNavigationContentLoader.LoadContent(region, new NavigationContext(new Mock<IRegionNavigationService>().Object, new Uri("http://testuri/", UriKind.Absolute)));
 }

        public void RegionExposesCollectionOfContainedViews()
        {
            IRegion region = new Region();

            object view = new object();

            region.Add(view);

            var views = region.Views;

            Assert.IsNotNull(views);
            Assert.AreEqual(1, views.Cast<object>().Count());
            Assert.AreSame(view, views.Cast<object>().ElementAt(0));
        }

        public void MissingCandidateViewCreatesViewInRegion()
        {
            this.ConfigureMockServiceLocator();

            // We cannot access the UnityRegionNavigationContentLoader directly so we need to call its
            // GetCandidatesFromRegion method through a navigation request.
            IRegion testRegion = new Region();

            Assert.AreEqual(0, testRegion.Views.Count());
            Assert.AreEqual(0, testRegion.ActiveViews.Count());

            testRegion.RequestNavigate("MockView1");

            Assert.AreEqual(1, testRegion.Views.Count());
            Assert.AreEqual(1, testRegion.ActiveViews.Count());
        }

        public void WhenAttached_ThenAddsViewsRegisteredToTheRegion()
        {
            var catalog = new AggregateCatalog();
            catalog.Catalogs.Add(new AssemblyCatalog(typeof(AutoPopulateExportedViewsBehavior).Assembly));
            catalog.Catalogs.Add(new TypeCatalog(typeof(View1), typeof(View2)));

            var container = new CompositionContainer(catalog);

            var behavior = container.GetExportedValue<AutoPopulateExportedViewsBehavior>();

            var region = new Region() { Name = "region1" };

            region.Behaviors.Add("", behavior);

            Assert.AreEqual(1, region.Views.Cast<object>().Count());
            Assert.IsTrue(region.Views.Cast<object>().Any(e => e.GetType() == typeof(View1)));
        }

 /// <summary>
 /// Creates a new <see cref="IRegion"/> and registers it in the default <see cref="IRegionManager"/>
 /// attaching to it a <see cref="DialogActivationBehavior"/> behavior.
 /// </summary>
 /// <param name="regionName">The name of the <see cref="IRegion"/>.</param>
 /// <param name="windowStyle">The style to apply to the window region.</param>
 public static void RegisterNewWindowRegion(string regionName, Style windowStyle)
 {
     // Creates a new region and registers it in the default region manager.
     // Another option if you need the complete infrastructure with the default region behaviors
     // is to extend DelayedRegionCreationBehavior overriding the CreateRegion method and create an 
     // instance of it that will be in charge of registering the Region once a RegionManager is
     // set as an attached property in the Visual Tree.
     var regionManager = ServiceLocator.Current.GetInstance<IRegionManager>();
     if (regionManager != null)
     {
         IRegion region = new Region();
         var behavior = new WindowDialogActivationBehavior {WindowStyle = windowStyle};
         region.Behaviors.Add(DialogActivationBehavior.BehaviorKey, behavior);
         region.Behaviors.Add(RegionActiveAwareBehavior.BehaviorKey, new RegionActiveAwareBehavior());
         regionManager.Regions.Add(regionName, region);
     }
 }

        public void ShouldFindCandidateViewWithFriendlyNameInRegion()
        {
            this.ConfigureMockServiceLocator();

            // We cannot access the MefRegionNavigationContentLoader directly so we need to call its
            // GetCandidatesFromRegion method through a navigation request.
            IRegion testRegion = new Region();

            MockView2 view = new MockView2();
            testRegion.Add(view);
            testRegion.Deactivate(view);

            testRegion.RequestNavigate("SomeView");

            Assert.IsTrue(testRegion.Views.Contains(view));
            Assert.IsTrue(testRegion.Views.Count() == 1);
            Assert.IsTrue(testRegion.ActiveViews.Count() == 1);
            Assert.IsTrue(testRegion.ActiveViews.Contains(view));
        }

        public void WhenClearChildViewsPropertyIsNotSet_ThenChildViewsRegionManagerIsNotCleared()
        {
            var regionManager = new MockRegionManager();

            var region = new Region();
            region.RegionManager = regionManager;

            var behavior = new ClearChildViewsRegionBehavior();
            behavior.Region = region;
            behavior.Attach();

            var childView = new MockFrameworkElement();
            region.Add(childView);

            Assert.AreEqual(regionManager, childView.GetValue(RegionManager.RegionManagerProperty));

            region.RegionManager = null;

            Assert.AreEqual(regionManager, childView.GetValue(RegionManager.RegionManagerProperty));
        }

        public async Task WhenClearChildViewsPropertyIsNotSet_ThenChildViewsRegionManagerIsNotCleared()
        {
            await ExecuteOnUIThread(() =>
                {
                    var regionManager = new MockRegionManager();

                    var region = new Region() { RegionManager = regionManager };

                    var behavior = new ClearChildViewsRegionBehavior() { Region = region };
                    behavior.Attach();

                    var childView = new MockFrameworkElement();
                    region.Add(childView);

                    Assert.AreEqual(regionManager, childView.GetValue(RegionManager.RegionManagerProperty));

                    region.RegionManager = null;

                    Assert.AreEqual(regionManager, childView.GetValue(RegionManager.RegionManagerProperty));
                });
        }

        public void ShouldFindCandidateViewInRegion()
        {
            IUnityContainer container = new UnityContainer();
            container.RegisterType<object, MockView>("MockView");

            this.ConfigureMockServiceLocator(container);

            // We cannot access the UnityRegionNavigationContentLoader directly so we need to call its
            // GetCandidatesFromRegion method through a navigation request.
            IRegion testRegion = new Region();

            MockView view = new MockView();
            testRegion.Add(view);
            testRegion.Deactivate(view);

            testRegion.RequestNavigate("MockView");

            Assert.IsTrue(testRegion.Views.Contains(view));
            Assert.IsTrue(testRegion.Views.Count() == 1);
            Assert.IsTrue(testRegion.ActiveViews.Count() == 1);
            Assert.IsTrue(testRegion.ActiveViews.Contains(view));
        }

        public void RemoveViewFiresViewRemovedEvent()
        {
            bool viewRemoved = false;

            IRegion region = new Region();
            object model = new object();
            region.Views.CollectionChanged += (sender, e) =>
                                                  {
                                                      if (e.Action == NotifyCollectionChangedAction.Remove)
                                                          viewRemoved = true;
                                                  };

            region.Add(model);
            Assert.IsFalse(viewRemoved);

            region.Remove(model);

            Assert.IsTrue(viewRemoved);
        }

        public void WhenViewHasBeenRemovedAndRegionManagerPropertyCleared_ThenItCanBeAddedAgainToARegion()
        {
            IRegion region = new Region { RegionManager = new MockRegionManager() };

            var view = new MockFrameworkElement();

            var scopedRegionManager = region.Add(view, null, true);

            Assert.AreEqual(view, region.Views.First());

            region.Remove(view);

            view.ClearValue(RegionManager.RegionManagerProperty);

            Assert.AreEqual(0, region.Views.Cast<object>().Count());

            var newScopedRegion = region.Add(view, null, true);

            Assert.AreEqual(view, region.Views.First());

            Assert.AreSame(newScopedRegion, view.GetValue(RegionManager.RegionManagerProperty));
        }