### Question:
DecisionNavigatorTreePresenter { public void removeAllItems() { view.clean(); getIndexedItems().clear(); } @Inject  DecisionNavigatorTreePresenter(final View view); View getView(); void setupItems(final List<DecisionNavigatorItem> items); void removeAllItems(); DecisionNavigatorItem getActiveParent(); void setActiveParentUUID(final String activeParentUUID); void selectItem(final String uuid); void deselectItem();  }### Answer:
@Test public void testRemoveAllItems() { presenter.removeAllItems(); verify(view).clean(); verify(indexedItems).clear(); }