JUnit android test classinheritance

I have simple Android application with some espresso tests. I want to write some base class so all of my test classes will inherit its @beforeClass and @afterClass methods, but the problem is when I do it like code example below, JUnit doesn't see any tests at al. I got Empty test suite. message. What's the problem?

Code example:

public class RealmTest {
    protected static Realm realm;

    @BeforeClass
    public static void beforeClass() {
        realm = Realm.getDefaultInstance();
        realm.setAutoRefresh(true);
    }

    @AfterClass
    public static void afterClass() {
        realm.close();
    }
}

@RunWith(AndroidJUnit4.class)
public class MainActivityTest extends RealmTest {
    @Rule
    public IntentsTestRule<MainActivity> activityTestRule = new IntentsTestRule<>(MainActivity.class);

    @Test
    public void startedFine() {
        assertNotNull(realm);
        onView(withId(R.id.button)).perform(click());
        intended(hasComponent(new ComponentName(getTargetContext(), EducationActivity.class)));
    }
}

If I'll run all tests, tests from MainActivityTest won't run. Thanks for your help, pls say if some additional info is needed.