@Test(expected = UnsupportedOperationException.class)
public void testIterator() {

	assertTrue(mapState.contains(1L));
	long value = mapState.get(1L);
	assertEquals(5L, value);
	assertTrue(mapState.contains(2L));
	value = mapState.get(2L);
	assertEquals(5L, value);
	Iterator<Map.Entry<Long, Long>> iterator = mapState.iterator();
	while (iterator.hasNext()) {
		iterator.remove();
	}
}