gistfile1.txt

import android.view.View;

import androidx.recyclerview.widget.RecyclerView;
import androidx.test.espresso.NoMatchingViewException;
import androidx.test.espresso.ViewAssertion;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;

public class RecyclerViewItemCountAssertion implements ViewAssertion {
    private final int expectedCount;

    public RecyclerViewItemCountAssertion(int expectedCount) {
        this.expectedCount = expectedCount;
    }

    @Override
    public void check(View view, NoMatchingViewException noViewFoundException) {
        if (noViewFoundException != null) {
            throw noViewFoundException;
        }

        RecyclerView recyclerView = (RecyclerView) view;
        if (recyclerView.getAdapter() != null) {
            assertThat(recyclerView.getAdapter().getItemCount(), is(expectedCount));
        }
    }
}