Base class for your Espresso tests, using JUnit4.

BaseTestCase

package qa.com.espressospoonstructure.tests;

import android.app.Activity;
import android.support.test.InstrumentationRegistry;
import android.support.test.runner.AndroidJUnit4;
import android.test.ActivityInstrumentationTestCase2;

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

@RunWith(AndroidJUnit4.class)
public abstract class BaseTestCase<T extends Activity> extends ActivityInstrumentationTestCase2<T> {

    protected BaseTestCase(Class<T> activityUnderTest) {
        super(activityUnderTest);
    }

    @Before
    public void setUp() throws Exception {
        super.setUp();

        //Required by JUnit4
        injectInstrumentation(InstrumentationRegistry.getInstrumentation());

        //Launches your activity
        Activity activity = getActivity();

    }

    @After
    public void tearDown() throws Exception {
        super.tearDown();
    }
}