### Question:
HugeAtomicBitSet { public BitSet toBitSet() { if (bits.size() <= MAX_ARRAY_LENGTH) { return new BitSet(((HugeAtomicLongArray.SingleHugeAtomicLongArray) bits).page(), (int) bits.size()); } throw new UnsupportedOperationException(formatWithLocale( "Cannot convert HugeAtomicBitSet with more than %s entries.", MAX_ARRAY_LENGTH )); } private  HugeAtomicBitSet(HugeAtomicLongArray bits, long numBits); static HugeAtomicBitSet create(long size, AllocationTracker tracker); boolean get(long index); void set(long index); void set(long startIndex, long endIndex); boolean getAndSet(long index); void flip(long index); long cardinality(); boolean isEmpty(); long capacity(); long size(); void clear(); void clear(long index); BitSet toBitSet();  }### Answer:
@Test void testToBitSet() { var atomicBitSet = HugeAtomicBitSet.create(42, AllocationTracker.empty()); atomicBitSet.set(1); atomicBitSet.set(9); atomicBitSet.set(8); atomicBitSet.set(4); var bitSet = atomicBitSet.toBitSet(); assertEquals(atomicBitSet.cardinality(), bitSet.cardinality()); assertTrue(bitSet.get(1)); assertTrue(bitSet.get(9)); assertTrue(bitSet.get(8)); assertTrue(bitSet.get(4)); bitSet.set(43); }