@Test
public void test_isValidPolicyItems_failures() {

	// null/empty list is good because there is nothing
	Assert.assertTrue(_validator.isValidPolicyItems(null, _failures, _serviceDef));
	_failures.isEmpty();
	List<RangerPolicyItem> policyItems = new ArrayList<>();
	Assert.assertTrue(_validator.isValidPolicyItems(policyItems, _failures, _serviceDef));
	_failures.isEmpty();
	
	// null elements in the list are flagged
	policyItems.add(null);
	Assert.assertFalse(_validator.isValidPolicyItems(policyItems, _failures, _serviceDef));
	_utils.checkFailureForMissingValue(_failures, "policy item");
}