### Question:
FirebaseAuthProvider implements AuthProvider { @Override public void onStop() { mGoogleAuthProvider.onStop(); } FirebaseAuthProvider(
            @Nullable FirebaseAuth firebaseAuth,
            GoogleAuthProvider googleProvider); @Override void onStart(); @Override void onStop(); @Override boolean isUserSignedIn(); @Override @Nullable User getCurrentUser(); @Nullable Task<GetTokenResult> getUserToken(boolean forceRefresh); @Nullable @Override Intent buildSignInIntent(); @Override Observable<FirebaseSignInUser> userFromSignInResult(int requestCode, int resultCode, Intent data); Observable<FirebaseSignInUser> signInLegacyUser();  }### Answer:
@Test public void onStop() { mFirebaseAuthProvider.onStop(); verify(mGoogleAuthProvider).onStop(); }