NestedScrollView scrolling via Kotlin Delegation (refs: https://medium.com/@devasierra/espresso-nestedscrollview-scrolling-via-kotlin-delegation-5e7f0aa64c09)

NestedScrollViewAction.kt

import android.view.View
import android.widget.HorizontalScrollView
import android.widget.ListView
import android.widget.ScrollView
import androidx.core.widget.NestedScrollView
import androidx.test.espresso.ViewAction
import androidx.test.espresso.action.ViewActions
import androidx.test.espresso.matcher.ViewMatchers.*
import org.hamcrest.Matcher
import org.hamcrest.Matchers

class NestedScrollViewAction(
    scrollToAction: ViewAction = ViewActions.scrollTo()
) : ViewAction by scrollToAction {
    override fun getConstraints(): Matcher<View> {
        return Matchers.allOf(
            withEffectiveVisibility(Visibility.VISIBLE),
            isDescendantOfA(
                Matchers.anyOf(
                    isAssignableFrom(NestedScrollView::class.java),
                    isAssignableFrom(ScrollView::class.java),
                    isAssignableFrom(HorizontalScrollView::class.java),
                    isAssignableFrom(ListView::class.java)
                )
            )
        )
    }

    companion object {
        fun nestedScrollTo(): NestedScrollViewAction {
            return NestedScrollViewAction()
        }
    }
}