@Test
public void testCheckNullForNullAdName() throws Exception {

	System.out.println("testCheckNullForNullAdName()");
	attributeToCheck.setValue(null);
	when(adNameAttr.getValue()).thenReturn(null);
	when(am.getPerunBeanIdsForUniqueAttributeValue(eq(session),any(Attribute.class))).thenReturn(Sets.newHashSet());
	classInstance.checkAttributeSemantics(session, group, attributeToCheck);
}