@Test
public void testGetDistinctKeysDescending1() {

    SortedKeyStatisticsAttributeIndex<Integer, Car> backingIndex = mockBackingIndex();
    PartialSortedKeyStatisticsAttributeIndex<Integer, Car> index = wrapWithPartialIndex(backingIndex);
    index.getDistinctKeysDescending(noQueryOptions());
    verify(backingIndex, times(1)).getDistinctKeysDescending(noQueryOptions());
}