GalleryActivityTest.java

package ru.ltst.u2020mvp.tests;

import android.support.test.espresso.matcher.ViewMatchers;
import android.support.test.runner.AndroidJUnit4;

import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import ru.ltst.u2020mvp.R;
import ru.ltst.u2020mvp.tests.util.ActivityRule;
import ru.ltst.u2020mvp.tests.util.Constants;
import ru.ltst.u2020mvp.tests.util.ViewActions;
import ru.ltst.u2020mvp.ui.gallery.GalleryActivity;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.isRoot;
import static android.support.test.espresso.matcher.ViewMatchers.withEffectiveVisibility;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static junit.framework.Assert.assertNotNull;

@RunWith(AndroidJUnit4.class)
public class GalleryActivityTest {

    @Rule
    public final ActivityRule<GalleryActivity> main = new ActivityRule<>(GalleryActivity.class);

    private GalleryActivity activity;

    @Before
    public void setUp() {
        activity = main.get();
    }

    @After
    public void tearDown() {
        activity = null;
    }

    @Test
    public void checkPreconditions() {
        assertNotNull(activity);
    }

    @Test
    public void loadData() {
        String tag = "1. Root view visible, progress bar showing";
        onView(isRoot()).check(matches(withEffectiveVisibility(ViewMatchers.Visibility.VISIBLE)));
        tag = "2. Grid shown with images loaded";
        // TODO: remove wait delay, use RxJava's TestScheduler or Espresso.registerIdlingResource
        onView(isRoot()).perform(ViewActions.waitAtLeast(Constants.WAIT_DELAY));
        onView(withId(R.id.gallery_grid)).check(matches(withEffectiveVisibility(ViewMatchers.Visibility.VISIBLE)));
    }

    @Test
    public void listScrolling() {
        String tag = "1. Grid shown with images loaded";
        // TODO: remove wait delay, use RxJava's TestScheduler or Espresso.registerIdlingResource
        onView(isRoot()).perform(ViewActions.waitAtLeast(Constants.WAIT_DELAY));
        onView(withId(R.id.gallery_grid)).perform(ViewActions.swipeTop());
        tag = "2. Scrolled to bottom";
        tag = "3. Scrolled to top";
        onView(withId(R.id.gallery_grid)).perform(ViewActions.swipeBottom());
    }
}