### Question:
BitMapColumn extends BaseBitmapColumn { @Override public ImmutableBitMap getBitMapIndex(int index) { initIndexReader(); return indexReader.get(index); } BitMapColumn(IResourceLocation parent); @Override void putBitMapIndex(int index, ImmutableBitMap bitmap); @Override void putNullIndex(ImmutableBitMap bitMap); @Override ImmutableBitMap getBitMapIndex(int index); @Override boolean isReadable(); @Override void release();  }### Answer:
@Test public void getBitMapIndex() { BitmapAssert.equals(new RangeBitmap(1, 3), new BitMapColumn(new ResourceLocation("")).getBitMapIndex(0)); }