public void testRemoveBackNavigationListenersTransportsListenOperationOnce() {
App app = new AppImpl();
BackNavigationListener listener = mock( BackNavigationListener.class );
BackNavigationListener listener2 = mock( BackNavigationListener.class );
app.addBackNavigationListener( listener );
app.addBackNavigationListener( listener2 );
app.removeBackNavigationListener( listener );
app.removeBackNavigationListener( listener2 );
RemoteObject remoteObject = environment.getServiceObject();