Assert proper number of items in list with espresso

Question

What is the best way to inspect and assert that a listview is the expected size with android espresso?

I wrote this matcher, but don\'t quite know how to integrate i

Answer 1

There are two different approaches of getting items count in a list with espresso: First one is as @CoryRoy mentioned above - using TypeSafeMatcher, the other one is to use BoundedMatcher.

And because @CoryRoy already showed how to assert it, here I'd like to tell how to get(return) the number using different matchers.

public class CountHelper {

    private static int count;

    public static int getCountFromListUsingTypeSafeMatcher(@IdRes int listViewId) {
        count = 0;

        Matcher matcher = new TypeSafeMatcher() {
            @Override
            protected boolean matchesSafely(View item) {
                count = ((ListView) item).getCount();
                return true;
            }

            @Override
            public void describeTo(Description description) {
            }
        };

        onView(withId(listViewId)).check(matches(matcher));

        int result = count;
        count = 0;
        return result;
    }

    public static int getCountFromListUsingBoundedMatcher(@IdRes int listViewId) {
        count = 0;

        Matcher