public Capacity getClusterCapacity() {
        return getGroupCapacity(CLUSTER);
    }
@Test
    void testGetClusterCapacity() {
        
        List<GroupCapacity> list = new ArrayList<>();
        GroupCapacity groupCapacity = new GroupCapacity();
        groupCapacity.setId(1L);
        list.add(groupCapacity);
        
        String groupId = GroupCapacityPersistService.CLUSTER;
        when(jdbcTemplate.query(anyString(), eq(new Object[] {groupId}), any(RowMapper.class))).thenReturn(list);
        Capacity ret = service.getClusterCapacity();
        
        assertEquals(groupCapacity.getId(), ret.getId());
    }