AscendingBitSetIndexToIndexMultiMap implements IndexToIndexMultiMap, OutputStreamWritable { @Override public String toString() { return "AscendingBitSetIndexToIndexMultiMap{" + "values=" + map.size() + ", documentsCount=" + documentsCount + '}'; } AscendingBitSetIndexToIndexMultiMap(
            @NotNull final Collection<? extends Collection<Integer>> map,
            final int documentsCount); @Override long getSizeInBytes(); @Override void writeTo(
            @NotNull final OutputStream os); @Override String toString();  }
@Test public void tostring() { assertNotNull( new AscendingBitSetIndexToIndexMultiMap( singletonList(singletonList(1)), 0).toString()); }