Matchers.kt

fun nthChildOf(
    parentMatcher: Matcher<View>,
    childPosition: Int
): Matcher<View> {
    return object : TypeSafeMatcher<View>() {
        override fun describeTo(description: Description) {
            description.appendText("Position is $childPosition")
        }

        public override fun matchesSafely(view: View): Boolean {
            if (view.parent !is ViewGroup) {
                return parentMatcher.matches(view.parent)
            }
            val group = view.parent as ViewGroup
            return parentMatcher.matches(view.parent) && group.getChildAt(childPosition) == view
        }
    }
}