RecyclerView testing - Performing actions and matches on items by position

RecyclerViewMatcher.kt

import android.content.res.Resources
import android.view.View
import androidx.recyclerview.widget.RecyclerView
import org.hamcrest.Description
import org.hamcrest.Matcher
import org.hamcrest.TypeSafeMatcher

/**
 * Performing actions and matches on items by position.
 * @see <a href="https://github.com/dannyroa/espresso-samples">Android Espresso Samples by Danny Roa</a>
 */
class RecyclerViewMatcher private constructor(
    private val recyclerViewId: Int
) {

    fun atPosition(position: Int): Matcher<View> {
        return atPositionOnView(position, -1)
    }

    fun atPositionOnView(position: Int, targetViewId: Int): Matcher<View> {
        return object : TypeSafeMatcher<View>() {
            private var resources: Resources? = null

            override fun describeTo(description: Description) {
                var idDescription = "$recyclerViewId"
                resources?.let { resources ->
                    idDescription = try {
                        resources.getResourceName(recyclerViewId)
                    } catch (exception: Resources.NotFoundException) {
                        "Resource name not found with @id/$recyclerViewId"
                    }
                }
                description.appendText(idDescription)
            }

            override fun matchesSafely(view: View): Boolean {
                this.resources = view.resources
                val recyclerView: RecyclerView? = view.rootView.findViewById(recyclerViewId)
                val childView = recyclerView?.findViewHolderForAdapterPosition(position)?.itemView
                val targetView = if (targetViewId != -1) {
                    childView?.findViewById(targetViewId)
                } else {
                    childView
                }
                return view == targetView
            }
        }
    }

    companion object {
        fun withRecyclerView(recyclerViewId: Int): RecyclerViewMatcher {
            return RecyclerViewMatcher(recyclerViewId)
        }
    }
}