Espresso - Check RecyclerView items are ordered correctly

Question

How to go about checking whether RecyclerView items are displayed in the correct order using Espresso? I\'m trying to test it checking it by the text for the title of each e

Answer 1

If you want to match a matcher on a position in RecyclerView, then you can try to create a custom Matcher:

public static Matcher hasItemAtPosition(int position, Matcher matcher) {
    return new BoundedMatcher(RecyclerView.class) {

        @Override public void describeTo(Description description) {
            description.appendText("has item: ");
            matcher.describeTo(description);
            description.appendText(" at position: " + position);
        }

        @Override protected boolean matchesSafely(RecyclerView view) {
            RecyclerView.Adapter adapter = view.getAdapter();
            int type = adapter.getItemViewType(position);
            RecyclerView.ViewHolder holder = adapter.createViewHolder(view, type);
            adapter.onBindViewHolder(holder, position);
            return matcher.matches(holder.itemView);
        }
    };
}

And you can use it for example:

onView(withId(R.id.rv_metrics)).check(matches(0, hasDescendant(withText("Weight")))))