### Question:
AppLauncherPresenter { public boolean isAppLauncherEmpty() { return appLauncherAddEvents.isEmpty(); }  IsWidget getView(); void onAppLauncherRemoveEvent(@Observes final AppLauncherRemoveEvent event); void onAppLauncherAddEvent(@Observes final AppLauncherAddEvent event); boolean isAppLauncherEmpty();  }### Answer:
@Test public void testIsAppLauncherEmpty() { assertTrue(presenter.isAppLauncherEmpty()); presenter.onAppLauncherAddEvent(new AppLauncherAddEvent(null, null, null)); assertFalse(presenter.isAppLauncherEmpty()); }