@Test
 public void testNewTreeAfterShutdown_shouldNotCrash() {
   mOptionManager.clearFocusIfNewTree(mSelectionNode);
   mOptionManager.shutdown();
   mOptionManager.clearFocusIfNewTree(null);
   /* Everything should be recycled at this point */
   mSelectionNode = null;
 }
 @Test
 public void testUnregisterSharedPreferenceChangeListener() {
   mOptionManager.shutdown();
   assertFalse(mSharedPreferences.hasListener(mOptionManager));
 }