Trick to verify specified position of an view inside your parent using Espresso. Based on https://stackoverflow.com/a/24933287/659272

MyActivityTest.kt

...
    // Solution based on https://stackoverflow.com/a/24933287/659272

    @Test
    fun someTest() {

        val textView = onView(
                withId(R.id.editTextToVerifyPosition)
        )

        textView.check(
                matches(
                        isChildOfAtPositionMatcher(R.id.layoutToVerifyChildPosition, 1)
                )
        )
    }

    private fun isChildOfAtPositionMatcher(@IdRes parentId: Int, position: Int): Matcher<View> {

        var parentMatcher = withId(parentId)

        return object : TypeSafeMatcher<View>() {
            override fun describeTo(description: Description) {
                description.appendText("with first child view of type parentMatcher")
            }

            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(position) == view
            }
        }
    }

...