UI Testing the Get Hacking Android App

IntroductionActivityTest.java

import androidx.test.espresso.intent.Intents;
import androidx.test.ext.junit.rules.ActivityScenarioRule;
import androidx.test.ext.junit.runners.AndroidJUnit4;

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

import static androidx.test.espresso.Espresso.onView;
import static androidx.test.espresso.action.ViewActions.click;
import static androidx.test.espresso.assertion.ViewAssertions.matches;
import static androidx.test.espresso.intent.Intents.intended;
import static androidx.test.espresso.intent.matcher.IntentMatchers.hasComponent;
import static androidx.test.espresso.matcher.ViewMatchers.isDisplayed;
import static androidx.test.espresso.matcher.ViewMatchers.withId;

@RunWith(AndroidJUnit4.class)
public class IntroductionActivityTest {
    @Rule
    public final ActivityScenarioRule<IntroductionActivity> scenarioRule
            = new ActivityScenarioRule<>(IntroductionActivity.class);

    @Before
    public void setUp() {
        Intents.init();
    }

    @After
    public void tearDown() {
        Intents.release();
    }

    @Test
    public void onLaunch_displaysAllViews() {
        onView(withId(R.id.single_intro_text)).check(matches(isDisplayed()));
        onView(withId(R.id.single_intro_end_button)).check(matches(isDisplayed()));
    }

    @Test
    public void onClickButton_showsMainActivity() {
        onView(withId(R.id.single_intro_end_button)).perform(click());

        intended(hasComponent(MainActivity.class.getName()));
    }
}