IssueTracker

Component used: Navigation
Version used: 2.2.0-beta01

As advised here :
https://developer.android.com/guide/navigation/navigation-testing
and here https://developer.android.com/jetpack/androidx/releases/navigation#1.0.0-alpha09
The recommanded way to test the NavController is to use Mockito.
It worked well until I started to use navGraphViewModels() :
Fragment {
private val viewModel: ActivityViewModel by navGraphViewModels(R.id.activity_detail_graph) { viewModelFactory }
}

Starting with 2.2.0-alpha02, it get backstackentry :
val backStackEntry by lazy {
        findNavController().getBackStackEntry(navGraphId)
    }

But the NavBackStackEntry is a complex final class that can't be mocked, and is very difficult to instantiate (for test purpose).
What is the recommanded way to keep integration tests while using navigation 2.2.0 and a navGraphViewModels() ?