public ConcurrentMap<String, String> getHostMapping() {
        return hostMapping;
    }
@Test
    public void uriHostMappingEmpty() {
        final TiConfiguration tiConf =
                TDBSourceOptions.getTiConfiguration("http://0.0.0.0:2347", "", new HashMap<>());
        UriHostMapping uriHostMapping = (UriHostMapping) tiConf.getHostMapping();
        assertEquals(uriHostMapping.getHostMapping(), null);
    }