@Test
public void getVpcOffSvcProvidersMapForEmptyServiceTest() {

    long vpcOffId = 1L;
    List<VpcOfferingServiceMapVO> list = new ArrayList<VpcOfferingServiceMapVO>();
    list.add(mock(VpcOfferingServiceMapVO.class));
    when(manager._vpcOffSvcMapDao.listByVpcOffId(vpcOffId)).thenReturn(list);
    Map<Service, Set<Provider>> map = manager.getVpcOffSvcProvidersMap(vpcOffId);
    assertNotNull(map);
    assertEquals(map.size(),1);
}