### Question:
PositionListIndex { public Long2LongOpenHashMap asHashMap() { Long2LongOpenHashMap hashedPLI = new Long2LongOpenHashMap(clusters.size()); long uniqueValueCount = 0; for (LongArrayList sameValues : clusters) { for (long rowIndex : sameValues) { hashedPLI.put(rowIndex, uniqueValueCount); } uniqueValueCount++; } return hashedPLI; } PositionListIndex(List<LongArrayList> clusters);  PositionListIndex(); PositionListIndex intersect(PositionListIndex otherPLI); List<LongArrayList> getClusters(); @Override PositionListIndex clone(); @Override int hashCode(); @Override boolean equals(Object obj); Long2LongOpenHashMap asHashMap(); long size(); boolean isEmpty(); boolean isUnique(); long getRawKeyError();  }### Answer:
@Test public void testAsHashMap() { PositionListIndex firstPLI = fixture.getFirstPLI(); Long2LongOpenHashMap expectedHashMap = fixture.getFirstPLIAsHashMap(); assertEquals(expectedHashMap, firstPLI.asHashMap()); }