VlanVO vlanVO = mock(VlanVO.class);
when(vlanVO.getVlanTag()).thenReturn(null);
when(_vlanDao.findById(anyLong())).thenReturn(vlanVO);
StaticNat rule = mock(StaticNat.class);
when(rule.getSourceIpAddressId()).thenReturn(1L);
when(rule.getDestIpAddress()).thenReturn("1.2.3.4");
when(rule.isForRevoke()).thenReturn(false);
List<StaticNat> rules = new ArrayList<StaticNat>();
rules.add(rule);
Answer answer = mock(Answer.class);
when(answer.getResult()).thenReturn(true);