Can I locally use espresso and Jacoco to Test my android app while using Firebase DB?

I'm working in an app that uses Firebase database. I also have to test it with espresso and jacoco, this is my test class:

@LargeTest
public class LoginActivityTest {

    @Rule
    public ActivityScenarioRule<LoginActivity> loginActivityTestRule = new ActivityScenarioRule<>(LoginActivity.class);

    @Test
    public void testRenderAll(){
        onView(withId(R.id.tvUsername)).check(matches(isDisplayed()));
        onView(withId(R.id.tvPassword)).check(matches(isDisplayed()));
        onView(withId(R.id.btnEnter)).check(matches(isDisplayed()));
    }
}

but when I run my test class, I get this error:

java.lang.IllegalStateException: Default FirebaseApp is not initialized in this 
process com.skapsdevelopment.firebase. 
Make sure to call FirebaseApp.initializeApp(Context) first.

And no matter what I do it keeps showing allways when I try to run the class.

I've tried

• Firebase.initializeApp(this); Doesn't work
• Inherent the OnCreate() function and call it there, also doesn't work
• Use FirebaseAuth also doesn't work

When I run just the test method it runs fine, but with the class, the error keeps showing. What can I do?