@Override
  public <K> URIMappingResult<K> mapUris(List<URIKeyPair<K>> uris) throws ServiceUnavailableException
  {
    return _uriMapper.mapUris(uris);
  }
@Test
  public void testMapUris() throws ServiceUnavailableException
  {
    URIMappingResult<Long> expectedMappingResult = new URIMappingResult<>(_mappedKeys, _unmappedKeys, _hostToPartitionId);
    when(_uriMapper.mapUris(_batchToUris)).thenReturn(expectedMappingResult);
    URIMappingResult<Long> mappingResult = _sgStrategy.mapUris(_batchToUris);
    Assert.assertEquals(mappingResult, expectedMappingResult);
  }