@Test(expected = WrongReferenceAttributeValueException.class)
public void testSemanticsNullValueWithUnixGroup() throws Exception {

	System.out.println("testSemanticsNullValueWithUnixGroup()");
	attributeToCheck.setValue(null);
	reqAttribute.setValue(1);
	classInstance.checkAttributeSemantics(sess, group, resource, attributeToCheck);
}