public void Constructor_Exception_NullStorageManager()
{
INavigationTarget navigationTarget = new MockNavigationTarget();
IViewFactory viewFactory = MockViewFactory.WithPageAndViewModel;
ILifetimeManager lifetimeManager = new MockLifetimeManager();
IStorageManager storageManager = null;
var e = Assert.Throws<ArgumentNullException>(() => new NavigationManager(navigationTarget, viewFactory, lifetimeManager, storageManager));
Assert.Equal("Value cannot be null.\r\nParameter name: storageManager", e.Message);
Assert.Equal("storageManager", e.ParamName);
}
public void Constructor_RegistersWithLifetimeManager()
{
MockLifetimeManager lifetimeManager = new MockLifetimeManager();
INavigationManager navigationManager = CreateNavigationManager(lifetimeManager: lifetimeManager);
Assert.Contains((ILifetimeAware)navigationManager, lifetimeManager.RegisteredServices);
}
// *** Private Methods ***
private TestableNavigationManager CreateNavigationManager(INavigationTarget navigationTarget = null, IViewFactory viewFactory = null, INavigationStack navigationStack = null, ILifetimeManager lifetimeManager = null, IStorageManager storageManager = null, bool navigationTargetIsNull = false)
{
if (navigationTarget == null && !navigationTargetIsNull)
navigationTarget = new MockNavigationTarget();
if (viewFactory == null)
viewFactory = MockViewFactory.WithPageAndViewModel;
if (navigationStack == null)
navigationStack = new MockNavigationStack();
if (lifetimeManager == null)
lifetimeManager = new MockLifetimeManager();
if (storageManager == null)
storageManager = new MockStorageManager();
TestableNavigationManager navigationManager = new TestableNavigationManager(navigationTarget, viewFactory, navigationStack, lifetimeManager, storageManager);
return navigationManager;
}
public async Task RestoreNavigationStack_RestoresPreviousNavigationStackViaRoamingStorage()
{
IStorageManager storageManager = new MockStorageManager();
// --- First Instance ---
{
MockNavigationStack navigationStack = new MockNavigationStack();
MockLifetimeManager lifetimeManager = new MockLifetimeManager();
INavigationManager navigationManager = CreateNavigationManager(navigationStack: navigationStack, lifetimeManager: lifetimeManager, storageManager: storageManager);
navigationManager.NavigationStorageType = NavigationStorageType.Roaming;
// Navigate to some pages
navigationStack.Add(new PageInfo("Page 1", null));
navigationStack.Add(new PageInfo("Page 2", null));
// Suspend the application
lifetimeManager.Suspend();
}
// --- Second Instance ---
{
MockNavigationStack navigationStack = new MockNavigationStack();
INavigationManager navigationManager = CreateNavigationManager(navigationStack: navigationStack, storageManager: storageManager);
navigationManager.NavigationStorageType = NavigationStorageType.Roaming;
// Restore the navigation stack
bool success = await navigationManager.RestoreNavigationStack();
// Assert that the current page is restored from storage
Assert.Equal(true, success);
string[] pageNames = navigationStack.Select(page => page.PageName).ToArray();
Assert.Equal(new string[] { "Page 1", "Page 2" }, pageNames);
}
}