IssueTracker

Currently navigation testing docs, provide good examples for instrumented tests and navigation controller tests.I believe  some examples could also be useful on how to provide a SavedStateHandle during test using navigation-compose type safe apis. This is a common use-case for view model tests

I suggest adding a ViewModelTest sample using the ViewModel sample in the same page;

```kotlin
// Add testing invoke statement to create saved state handles with route objects
import androidx.navigation.testing.invoke

@RunWith(RobolectricTestRunner::class)
class UserViewModelTest {

   @Test
    fun testUserDetailsFetchedFromUserRepository() {
        val savedStateHandle = SavedStateHandle(Profile(userId = "user1234"))
        val userRepository = MockUserRepository()
        val userViewModel = UserViewModel(savedStateHandle, userRepository)
    }

}
```

https://developer.android.com/develop/ui/compose/navigation#testing