### Question:
NavigationBarMixin implements Mixin { public NavigationBar getNavigationBar() { final View view = templateLayout.findManagedViewById(R.id.suw_layout_navigation_bar); return view instanceof NavigationBar ? (NavigationBar) view : null; } NavigationBarMixin(TemplateLayout layout); NavigationBar getNavigationBar(); void setNextButtonText(int text); void setNextButtonText(CharSequence text); CharSequence getNextButtonText(); void setNavigationBarListener(NavigationBarListener listener);  }### Answer:
@Test public void testGetNavigationBar() { NavigationBarMixin mixin = new NavigationBarMixin(mTemplateLayout); assertSame(mNavigationBar, mixin.getNavigationBar()); }