Testing AppCompatActivity toolbar with FragmentScenario.EmptyFragmentActivity

Question

For my test I launch the fragment in an emtpy activity root view container

@Before
fun init() {
    scenario = launchFragmentInContainer(null, R.style.Theme_AppCompat) {
        MyFragment()
    }
}

and in my fragment, I configure the toolbar to provide back button

(activity as AppCompatActivity).setSupportActionBar(binding.toolbar)
(activity as AppCompatActivity).supportActionBar?.setDisplayHomeAsUpEnabled(true)

so when I run my test I get a class cast exception

java.lang.ClassCastException: androidx.fragment.app.testing.FragmentScenario$EmptyFragmentActivity cannot be cast to androidx.appcompat.app.AppCompatActivity

so I have to add a gaurd

if(requireActivity() !is FragmentScenario.EmptyFragmentActivity)
    configureToolBar()    

so is there another way to configure the toolbar so that I can test the back button intent launch with espresso?

edit

Apparently there is a way to create a custom activity/container.