func testListObjectsOnVersionedBuckets(obj ObjectLayer, instanceType string, t1 TestErrHandler) {
	_testListObjects(obj, instanceType, t1, true)
}

// Unit test for ListObjects.
func testListObjects(obj ObjectLayer, instanceType string, t1 TestErrHandler) {
	_testListObjects(obj, instanceType, t1, false)
}

func _testListObjects(obj ObjectLayer, instanceType string, t1 TestErrHandler, versioned bool) {

	err = obj.MakeBucket(context.Background(), bucket, MakeBucketOptions{})
	if err != nil {
		// failed to create newbucket, abort.
		t.Fatalf("%s : %s", instanceType, err.Error())
	}

	res, err := obj.NewMultipartUpload(context.Background(), bucket, "\\", opts)
	if err != nil {
		t.Fatalf("%s : %s", instanceType, err.Error())
	}

						batchLogIf(ctx, ri.updateAfter(ctx, api, 10*time.Second, job))
					}
				}
			}
			for obj := range walkCh {
				if obj.DeleteMarker || !obj.VersionPurgeStatus.Empty() || obj.Size >= int64(smallerThan) {
					slowCh <- obj
					continue
				}

				batch = append(batch, obj)

				if len(batch) < *r.Source.Snowball.Batch {
					continue
				}
				writeFn(batch)

            }
            buf.append('}');
        } else if ((obj instanceof Integer) || (obj instanceof Long) || (obj instanceof Float) || (obj instanceof Double)) {
            buf.append((obj));
        } else if (obj instanceof Boolean) {
            buf.append(obj.toString());
        } else if (obj instanceof Date) {

// return credentials.
func initAPIHandlerTest(ctx context.Context, obj ObjectLayer, endpoints []string) (string, http.Handler, error) {
	initAllSubsystems(ctx)

	initConfigSubsystem(ctx, obj)

	globalIAMSys.Init(ctx, obj, globalEtcdClient, 2*time.Second)

	// get random bucket name.
	bucketName := getRandomBucketName()

	// Create bucket.
	err := obj.MakeBucket(context.Background(), bucketName, MakeBucketOptions{})

  }

  /** Unboxes {@code obj}. Assumes that obj is not {@code null} or a {@link SetFuture}. */
  @ParametricNullness
  private V getDoneValue(Object obj) throws ExecutionException {
    // While this seems like it might be too branch-y, simple benchmarking proves it to be
    // unmeasurable (comparing done AbstractFutures with immediateFuture)
    if (obj instanceof Cancellation) {

		concurrent = len(objects)
	}

	var mu sync.Mutex
	eg := errgroup.WithNErrs(len(objects)).WithConcurrency(concurrent)
	for j, obj := range objects {
		j := j
		obj := obj
		eg.Go(func() error {
			pinfo, _, err := z.getPoolInfoExistingWithOpts(ctx, bucket, obj.ObjectName, ObjectOptions{
				NoLock: true,
			})
			if err != nil {
				if !isErrObjectNotFound(err) && !isErrVersionNotFound(err) {

		if ver.header.Type == DeleteType {
			continue
		}

		obj, err := x.getIdx(i)
		if err != nil {
			return nil, err
		}
		switch ver.header.Type {
		case ObjectType:
			if obj.ObjectV2 == nil {
				return nil, errors.New("obj.ObjectV2 unexpectedly nil")
			}
			dds = append(dds, uuid.UUID(obj.ObjectV2.DataDir).String())
			if obj.ObjectV2.VersionID == [16]byte{} {
				dds = append(dds, nullVersionID)

        return delegate().hashCode();
      }
    }

    @Override
    public boolean equals(@CheckForNull Object obj) {
      if (this == obj) {
        return true;
      }
      synchronized (mutex) {
        return delegate().equals(obj);
      }
    }
  }

    public boolean contains(@CheckForNull Object obj) {
      if (obj instanceof Set) {
        Set<?> set = (Set<?>) obj;
        return inputSet.keySet().containsAll(set);
      }
      return false;
    }

    @Override
    public boolean equals(@CheckForNull Object obj) {
      if (obj instanceof PowerSet) {
        PowerSet<?> that = (PowerSet<?>) obj;