MainActivityTest.java

package de.wiberry.ci.testthing;

import android.support.test.filters.LargeTest;
import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.*;
import static android.support.test.espresso.assertion.ViewAssertions.*;
import static android.support.test.espresso.matcher.ViewMatchers.*;

@LargeTest
@RunWith(AndroidJUnit4.class)
public class MainActivityTest {

    /**
     * Create the activity that is to be tested
     */
    @Rule
    public ActivityTestRule<MainActivity> mainActivityActivityTestRule = new ActivityTestRule<>(MainActivity.class);

    /**
     * Dummy test for correct text in default view
     */
    @Test
    public void mainActivityHelloWorld() {
        onView(withId(R.id.hello)).check(matches(withText("Hello World!")));
    }

    @Test
    public void mainActivitySecondButton() {
        onView(withId(R.id.buttonTwo)).perform(click());
        onView(withId(R.id.hello)).check(matches(withText("Goodbye World!")));
    }

    @Test
    public void mainActivityRButton() {
        onView(withId(R.id.buttonOne)).perform(click());
        onView(withId(R.id.hello)).check(matches(withText("Goodbye World!")));
    }

}