private void addBlocksFromFragments(Collection<Fragment> src, List<MemoryBlock> dest) {
    for (MemoryBlock block : src) {
      dest.add(new MemoryBlockNode(ma, block));
    }
  }
Tests override this method to simulate concurrent modification
geode-core/src/main/java/org/apache/geode/internal/offheap/FreeListManager.java