assert which layout is loaded?

i am setting two different layouts,one for landscape mode and one for portrait mode. now i want to assert which one is set public void testOrienationChange() {

getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            getInstrumentation().waitForIdleSync();
            assert which one is visible/set
    getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
assert which one is visible/set

how to test which layout is set or visible from test class?