|
private RequestNavigate ( |
||
| target | ||
| navigationCallback | Action |
|
| return | void | |
public void WhenNavigating_ViewIsActivated()
{
// Prepare
object view = new object();
Uri viewUri = new Uri(view.GetType().Name, 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 WhenNavigatingWithNullCallback_ThenThrows()
{
var region = new Region();
var navigationUri = new Uri("/", UriKind.Relative);
IServiceLocator serviceLocator = new Mock<IServiceLocator>().Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
ExceptionAssert.Throws<ArgumentNullException>(
() =>
{
target.RequestNavigate(navigationUri, null);
});
}
public void WhenNavigatingFromActiveViewWithNavigatinAwareDataConext_NotifiesContextOfNavigatingFrom()
{
// Arrange
var region = new Region();
var mockDataContext = new Mock<INavigationAware>();
var view1Mock = new Mock<FrameworkElement>();
var view1 = view1Mock.Object;
view1.DataContext = mockDataContext.Object;
region.Add(view1);
var view2 = new object();
region.Add(view2);
region.Activate(view1);
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());
var navigationUri = new Uri(view2.GetType().Name, UriKind.Relative);
IServiceLocator serviceLocator = serviceLocatorMock.Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
// Act
target.RequestNavigate(navigationUri, nr => { });
// Verify
mockDataContext.Verify(v => v.OnNavigatedFrom(It.Is<NavigationContext>(ctx => ctx.Uri == navigationUri && ctx.Parameters.Count() == 0)));
}
public void WhenNavigationFromViewThatIsNavigationAware_OnlyNotifiesOnNavigateFromForActiveViews()
{
// Arrange
bool navigationFromInvoked = false;
var region = new Region();
var viewMock = new Mock<INavigationAware>();
viewMock
.Setup(x => x.OnNavigatedFrom(It.IsAny<NavigationContext>())).Callback(() => navigationFromInvoked = true);
var view = viewMock.Object;
region.Add(view);
var targetViewMock = new Mock<INavigationAware>();
region.Add(targetViewMock.Object);
var activeViewMock = new Mock<INavigationAware>();
region.Add(activeViewMock.Object);
region.Activate(activeViewMock.Object);
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());
var navigationUri = new Uri(targetViewMock.Object.GetType().Name, UriKind.Relative);
IServiceLocator serviceLocator = serviceLocatorMock.Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
// Act
target.RequestNavigate(navigationUri, nr => { });
// Verify
Assert.IsFalse(navigationFromInvoked);
}
public void WhenTargetViewCreationThrowsWithAsyncConfirmation_ThenExceptionIsProvidedToNavigationCallback()
{
var serviceLocatorMock = new Mock<IServiceLocator>();
var targetException = new Exception();
var targetHandlerMock = new Mock<IRegionNavigationContentLoader>();
targetHandlerMock
.Setup(th => th.LoadContent(It.IsAny<IRegion>(), It.IsAny<NavigationContext>()))
.Throws(targetException);
var journalMock = new Mock<IRegionNavigationJournal>();
Action<bool> navigationCallback = null;
var viewMock = new Mock<IConfirmNavigationRequest>();
viewMock
.Setup(v => v.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()))
.Callback<NavigationContext, Action<bool>>((nc, c) => { navigationCallback = c; });
var region = new Region();
region.Add(viewMock.Object);
region.Activate(viewMock.Object);
var target = new RegionNavigationService(serviceLocatorMock.Object, targetHandlerMock.Object, journalMock.Object);
target.Region = region;
NavigationResult result = null;
target.RequestNavigate(new Uri("", UriKind.Relative), nr => result = nr);
navigationCallback(true);
Assert.IsNotNull(result);
Assert.AreSame(targetException, result.Error);
}
public void BeforeNavigating_NavigatingEventIsRaised()
{
// Prepare
object view = new object();
Uri viewUri = new Uri(view.GetType().Name, 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;
bool isNavigatingRaised = false;
target.Navigating += delegate(object sender, RegionNavigationEventArgs e)
{
if (sender == target)
{
isNavigatingRaised = true;
}
};
// Act
bool isNavigationSuccessful = false;
target.RequestNavigate(viewUri, nr => isNavigationSuccessful = nr.Result == true);
// Verify
Assert.IsTrue(isNavigationSuccessful);
Assert.IsTrue(isNavigatingRaised);
}
public void WhenViewModelAcceptsNavigationOutAfterNewIncomingRequestIsReceived_ThenOriginalRequestIsIgnored()
{
var region = new Region();
var viewModelMock = new Mock<IConfirmNavigationRequest>();
var viewMock = new Mock<FrameworkElement>();
var view = viewMock.Object;
view.DataContext = viewModelMock.Object;
var confirmationRequests = new List<Action<bool>>();
viewModelMock
.Setup(icnr => icnr.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()))
.Callback<NavigationContext, Action<bool>>((nc, c) => { confirmationRequests.Add(c); });
region.Add(view);
region.Activate(view);
var navigationUri = new Uri("", UriKind.Relative);
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock
.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>())
.Returns(new RegionNavigationJournalEntry());
var contentLoaderMock = new Mock<IRegionNavigationContentLoader>();
contentLoaderMock
.Setup(cl => cl.LoadContent(region, It.IsAny<NavigationContext>()))
.Returns(view);
var serviceLocator = serviceLocatorMock.Object;
var contentLoader = contentLoaderMock.Object;
var journal = new Mock<IRegionNavigationJournal>().Object;
var target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
bool firstNavigation = false;
bool secondNavigation = false;
target.RequestNavigate(navigationUri, nr => firstNavigation = nr.Result.Value);
target.RequestNavigate(navigationUri, nr => secondNavigation = nr.Result.Value);
Assert.AreEqual(2, confirmationRequests.Count);
confirmationRequests[0](true);
confirmationRequests[1](true);
Assert.IsFalse(firstNavigation);
Assert.IsTrue(secondNavigation);
}
public void WhenNavigationFailsBecauseTheContentViewCannotBeRetrieved_ThenNavigationFailedIsRaised()
{
// Prepare
var region = new Region { Name = "RegionName" };
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock
.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>())
.Returns(new RegionNavigationJournalEntry());
var contentLoaderMock = new Mock<IRegionNavigationContentLoader>();
contentLoaderMock
.Setup(cl => cl.LoadContent(region, It.IsAny<NavigationContext>()))
.Throws<InvalidOperationException>();
var serviceLocator = serviceLocatorMock.Object;
var contentLoader = contentLoaderMock.Object;
var journal = new Mock<IRegionNavigationJournal>().Object;
var target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
RegionNavigationFailedEventArgs eventArgs = null;
target.NavigationFailed += delegate(object sender, RegionNavigationFailedEventArgs e)
{
if (sender == target)
{
eventArgs = e;
}
};
// Act
bool? isNavigationSuccessful = null;
target.RequestNavigate(new Uri("invalid", UriKind.Relative), nr => isNavigationSuccessful = nr.Result);
// Verify
Assert.IsFalse(isNavigationSuccessful.Value);
Assert.IsNotNull(eventArgs);
Assert.IsNotNull(eventArgs.Error);
}
public void WhenNavigatingAndDataContextOnCurrentlyActiveViewImplementsINavigateWithVeto_ThenNavigationRequestQueriesForVeto()
{
// Prepare
var region = new Region();
var viewModelMock = new Mock<IConfirmNavigationRequest>();
viewModelMock
.Setup(ina => ina.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()))
.Verifiable();
var viewMock = new Mock<FrameworkElement>();
var view = viewMock.Object;
view.DataContext = viewModelMock.Object;
region.Add(view);
region.Activate(view);
var navigationUri = new Uri(view.GetType().Name, UriKind.Relative);
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());
IServiceLocator serviceLocator = serviceLocatorMock.Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
// Act
target.RequestNavigate(navigationUri, nr => { });
// Verify
viewModelMock.VerifyAll();
}
public void WhenNavigating_ThenNavigationRequestQueriesForVetoOnAllActiveViewsIfAllSucceed()
{
// Prepare
var region = new Region();
var view1Mock = new Mock<IConfirmNavigationRequest>();
view1Mock
.Setup(ina => ina.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()))
.Callback<NavigationContext, Action<bool>>((nc, c) => c(true))
.Verifiable();
var view1 = view1Mock.Object;
region.Add(view1);
region.Activate(view1);
var view2Mock = new Mock<IConfirmNavigationRequest>();
var view2 = view2Mock.Object;
region.Add(view2);
var view3Mock = new Mock<INavigationAware>();
var view3 = view3Mock.Object;
region.Add(view3);
region.Activate(view3);
var view4Mock = new Mock<IConfirmNavigationRequest>();
view4Mock
.Setup(ina => ina.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()))
.Callback<NavigationContext, Action<bool>>((nc, c) => c(true))
.Verifiable();
var view4 = view4Mock.Object;
region.Add(view4);
region.Activate(view4);
var navigationUri = new Uri(view1.GetType().Name, UriKind.Relative);
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());
IServiceLocator serviceLocator = serviceLocatorMock.Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
// Act
target.RequestNavigate(navigationUri, nr => { });
// Verify
view1Mock.VerifyAll();
view2Mock.Verify(ina => ina.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()), Times.Never());
view3Mock.VerifyAll();
view4Mock.VerifyAll();
}
public void WhenNavigating_NavigationIsRecordedInJournal()
{
// Prepare
object view = new object();
Uri viewUri = new Uri(view.GetType().Name, UriKind.Relative);
IRegion region = new Region();
region.Add(view);
string regionName = "RegionName";
RegionManager regionManager = new RegionManager();
regionManager.Regions.Add(regionName, region);
IRegionNavigationJournalEntry journalEntry = new RegionNavigationJournalEntry();
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>())
.Returns(journalEntry);
IServiceLocator serviceLocator = serviceLocatorMock.Object;
RegionNavigationContentLoader contentLoader = new RegionNavigationContentLoader(serviceLocator);
var journalMock = new Mock<IRegionNavigationJournal>();
journalMock.Setup(x => x.RecordNavigation(journalEntry)).Verifiable();
IRegionNavigationJournal journal = journalMock.Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
// Act
target.RequestNavigate(viewUri, nr => { });
// Verify
Assert.IsNotNull(journalEntry);
Assert.AreEqual(viewUri, journalEntry.Uri);
journalMock.VerifyAll();
}
public void WhenNavigatingAndBothViewAndDataContextImplementINavigationAware_ThenNavigatedIsInvokesOnNavigation()
{
// Prepare
var region = new Region();
Mock<FrameworkElement> mockFrameworkElement = new Mock<FrameworkElement>();
Mock<INavigationAware> mockINavigationAwareView = mockFrameworkElement.As<INavigationAware>();
mockINavigationAwareView.Setup(ina => ina.IsNavigationTarget(It.IsAny<NavigationContext>())).Returns(true);
Mock<INavigationAware> mockINavigationAwareDataContext = new Mock<INavigationAware>();
mockINavigationAwareDataContext.Setup(ina => ina.IsNavigationTarget(It.IsAny<NavigationContext>())).Returns(true);
mockFrameworkElement.Object.DataContext = mockINavigationAwareDataContext.Object;
var view = mockFrameworkElement.Object;
region.Add(view);
var navigationUri = new Uri(view.GetType().Name, UriKind.Relative);
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
target.RequestNavigate(navigationUri, nr => { });
// Verify
mockINavigationAwareView.Verify(v => v.OnNavigatedTo(It.Is<NavigationContext>(nc => nc.Uri == navigationUri)));
mockINavigationAwareDataContext.Verify(v => v.OnNavigatedTo(It.Is<NavigationContext>(nc => nc.Uri == navigationUri)));
}
public void WhenNavigatingWithNullUri_Throws()
{
// Prepare
IRegion region = new Region();
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());
IServiceLocator serviceLocator = serviceLocatorMock.Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
// Act
NavigationResult navigationResult = null;
target.RequestNavigate((Uri)null, nr => navigationResult = nr);
// Verify
Assert.IsFalse(navigationResult.Result.Value);
Assert.IsNotNull(navigationResult.Error);
Assert.IsInstanceOfType(navigationResult.Error, typeof(ArgumentNullException));
}
public void WhenNavigationFailsBecauseDataContextForActiveViewRejectsIt_ThenNavigationFailedIsRaised()
{
// Prepare
var region = new Region { Name = "RegionName" };
var viewModel1Mock = new Mock<IConfirmNavigationRequest>();
viewModel1Mock
.Setup(ina => ina.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()))
.Callback<NavigationContext, Action<bool>>((nc, c) => c(false))
.Verifiable();
var view1Mock = new Mock<FrameworkElement>();
var view1 = view1Mock.Object;
view1.DataContext = viewModel1Mock.Object;
var view2 = new object();
region.Add(view1);
region.Add(view2);
region.Activate(view1);
var navigationUri = new Uri(view2.GetType().Name, UriKind.Relative);
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock
.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>())
.Returns(new RegionNavigationJournalEntry());
var contentLoaderMock = new Mock<IRegionNavigationContentLoader>();
contentLoaderMock
.Setup(cl => cl.LoadContent(region, It.IsAny<NavigationContext>()))
.Returns(view2);
var serviceLocator = serviceLocatorMock.Object;
var contentLoader = contentLoaderMock.Object;
var journal = new Mock<IRegionNavigationJournal>().Object;
var target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
RegionNavigationFailedEventArgs eventArgs = null;
target.NavigationFailed += delegate(object sender, RegionNavigationFailedEventArgs e)
{
if (sender == target)
{
eventArgs = e;
}
};
// Act
bool? isNavigationSuccessful = null;
target.RequestNavigate(navigationUri, nr => isNavigationSuccessful = nr.Result);
// Verify
viewModel1Mock.VerifyAll();
Assert.IsFalse(isNavigationSuccessful.Value);
Assert.IsNotNull(eventArgs);
Assert.IsNull(eventArgs.Error);
}
public void WhenNavigatingWithNoRegionSet_ThenMarshallExceptionToCallback()
{
var navigationUri = new Uri("/", UriKind.Relative);
IServiceLocator serviceLocator = new Mock<IServiceLocator>().Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
Exception error = null;
target.RequestNavigate(navigationUri, nr => error = nr.Error);
Assert.IsNotNull(error);
Assert.IsInstanceOfType(error, typeof(InvalidOperationException));
}
public void WhenRequestNavigateAwayOnDataContextRejectsThroughCallback_ThenNavigationDoesNotProceed()
{
// Prepare
var region = new Region();
var view1DataContextMock = new Mock<IConfirmNavigationRequest>();
view1DataContextMock
.Setup(ina => ina.ConfirmNavigationRequest(It.IsAny<NavigationContext>(), It.IsAny<Action<bool>>()))
.Callback<NavigationContext, Action<bool>>((nc, c) => c(false))
.Verifiable();
var view1Mock = new Mock<FrameworkElement>();
var view1 = view1Mock.Object;
view1.DataContext = view1DataContextMock.Object;
var view2 = new object();
region.Add(view1);
region.Add(view2);
region.Activate(view1);
var navigationUri = new Uri(view2.GetType().Name, UriKind.Relative);
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());
IServiceLocator serviceLocator = serviceLocatorMock.Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = region;
// Act
var navigationFailed = false;
target.RequestNavigate(navigationUri, nr => { navigationFailed = nr.Result == false; });
// Verify
view1DataContextMock.VerifyAll();
Assert.IsTrue(navigationFailed);
CollectionAssert.AreEqual(new object[] { view1 }, region.ActiveViews.ToArray());
}
public void WhenNavigatingWithNullUri_ThenMarshallExceptionToCallback()
{
IServiceLocator serviceLocator = new Mock<IServiceLocator>().Object;
RegionNavigationContentLoader contentLoader = new Mock<RegionNavigationContentLoader>(serviceLocator).Object;
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, contentLoader, journal);
target.Region = new Region();
Exception error = null;
target.RequestNavigate(null, nr => error = nr.Error);
Assert.IsNotNull(error);
Assert.IsInstanceOfType(error, typeof(ArgumentNullException));
}
public void WhenNavigatingAndViewCannotBeAcquired_ThenNavigationResultHasError()
{
// Prepare
object view = new object();
Uri viewUri = new Uri(view.GetType().Name, UriKind.Relative);
IRegion region = new Region();
region.Add(view);
string otherType = "OtherType";
var serviceLocatorMock = new Mock<IServiceLocator>();
serviceLocatorMock.Setup(x => x.GetInstance<IRegionNavigationJournalEntry>()).Returns(new RegionNavigationJournalEntry());
IServiceLocator serviceLocator = serviceLocatorMock.Object;
Mock<IRegionNavigationContentLoader> targetHandlerMock = new Mock<IRegionNavigationContentLoader>();
targetHandlerMock.Setup(th => th.LoadContent(It.IsAny<IRegion>(), It.IsAny<NavigationContext>())).Throws<ArgumentException>();
IRegionNavigationJournal journal = new Mock<IRegionNavigationJournal>().Object;
RegionNavigationService target = new RegionNavigationService(serviceLocator, targetHandlerMock.Object, journal);
target.Region = region;
// Act
Exception error = null;
target.RequestNavigate(
new Uri(otherType.GetType().Name, UriKind.Relative),
nr =>
{
error = nr.Error;
});
// Verify
bool isViewActive = region.ActiveViews.Contains(view);
Assert.IsFalse(isViewActive);
Assert.IsInstanceOfType(error, typeof(ArgumentException));
}