public async Task NavigationTaskCompletesAfterDeferalHasFinished(string testCase)
{
Routing.RegisterRoute(nameof(NavigationTaskCompletesAfterDeferalHasFinished), typeof(ContentPage));
var shell = new TestShell()
{
Items = { CreateShellItem<FlyoutItem>() }
};
ShellNavigatingDeferral _token = null;
shell.Navigating += async (_, args) =>
{
_token = args.GetDeferral();
await Task.Delay(500);
_token.Complete();
};
switch (testCase)
{
case "PopToRoot":
await shell.Navigation.PopToRootAsync();
break;
case "Pop":
await shell.Navigation.PopAsync();
break;
case "GoToAsync":
await shell.GoToAsync(nameof(NavigationTaskCompletesAfterDeferalHasFinished));
break;
case "Push":
await shell.Navigation.PushAsync(new ContentPage());
break;
}
Assert.IsTrue(_token.IsCompleted);
}
public async Task DeferPopNavigation(string testCase)
{
TestShell shell = new TestShell()
{
Items = { CreateShellItem <FlyoutItem>() }
};
await shell.Navigation.PushAsync(new ContentPage());
await shell.Navigation.PushAsync(new ContentPage());
ShellNavigatingDeferral _token = null;
shell.Navigating += async(_, args) =>
{
_token = args.GetDeferral();
await Task.Delay(500);
Assert.AreEqual(3, shell.Navigation.NavigationStack.Count);
_token.Complete();
};
var source = new TaskCompletionSource <object>();
shell.Navigated += (_, args) =>
{
source.SetResult(true);
};
if (testCase == "Pop")
{
await shell.Navigation.PopAsync();
await source.Task;
Assert.AreEqual(2, shell.Navigation.NavigationStack.Count);
}
else
{
await shell.Navigation.PopToRootAsync();
await source.Task;
Assert.AreEqual(1, shell.Navigation.NavigationStack.Count);
}
}
