@Test
public void getter_hiddenElementSelectors_unmodifiable() throws Exception {

	DomSelector[] selectors = { new DomSelector(SelectorType.ID, "id"),
			new DomSelector(SelectorType.CLASS_NAME, "class") };
	ScreenshotArgument arg = new ScreenshotArgument("scid", null, Arrays.asList(selectors));
	expected.expect(UnsupportedOperationException.class);
	arg.getHiddenElementSelectors().add(new DomSelector(SelectorType.ID, "test"));
}