### Question:
HugeLongArrayStack { public boolean isEmpty() { return size() == 0; } private  HugeLongArrayStack(HugeLongArray array); static HugeLongArrayStack newStack(long capacity, AllocationTracker tracker); void push(long v); long pop(); long size(); boolean isEmpty();  }### Answer:
@Test void testIsEmpty() { var q = HugeLongArrayStack.newStack(10, AllocationTracker.empty()); assertTrue(q.isEmpty()); q.push(42); assertFalse(q.isEmpty()); q.pop(); assertTrue(q.isEmpty()); }