github.com/janelia-flyem/dvid@v1.0.0/datatype/labelarray/mutate_test.go

package labelarray

import (
	"bytes"
	"compress/gzip"
	"encoding/binary"
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"math/rand"
	"net/http"
	"reflect"
	"runtime"
	"sync"
	"testing"
	"time"

	"github.com/janelia-flyem/dvid/datastore"
	"github.com/janelia-flyem/dvid/datatype/common/downres"
	"github.com/janelia-flyem/dvid/datatype/common/labels"
	"github.com/janelia-flyem/dvid/dvid"
	"github.com/janelia-flyem/dvid/server"

	lz4 "github.com/janelia-flyem/go/golz4-updated"
)

type testBody struct {
	label        uint64
	offset, size dvid.Point3d // these are just to give ROI of voxelSpans
	blockSpans   dvid.Spans
	voxelSpans   dvid.Spans // in DVID coordinates, not relative coordinates
}

var emptyBody = testBody{
	label:      0,
	offset:     dvid.Point3d{},
	size:       dvid.Point3d{},
	blockSpans: dvid.Spans{},
	voxelSpans: dvid.Spans{},
}

func checkSparsevolsCoarse(t *testing.T, encoding []byte) {
	length := len(encoding)
	var i int
	for label := uint64(1); label <= 3; label++ {
		if i+28 >= length {
			t.Fatalf("Expected label %d but only %d bytes remain in encoding\n", label, len(encoding[i:]))
		}
		gotLabel := binary.LittleEndian.Uint64(encoding[i : i+8])
		if gotLabel != label {
			t.Errorf("Expected label %d, got label %d in returned coarse sparsevols\n", label, gotLabel)
		}
		i += 8
		var spans dvid.Spans
		if err := spans.UnmarshalBinary(encoding[i:]); err != nil {
			t.Errorf("Error in decoding coarse sparse volume: %v\n", err)
			return
		}
		i += 4 + len(spans)*16
		b := bodies[label-1]
		if !reflect.DeepEqual(spans, b.blockSpans) {
			_, fn, line, _ := runtime.Caller(1)
			t.Errorf("Expected coarse spans for label %d:\n%s\nGot spans [%s:%d]:\n%s\n", b.label, b.blockSpans, fn, line, spans)
		}
	}
}

// Makes sure the coarse sparse volume encoding matches the body.
func (b testBody) checkCoarse(t *testing.T, encoding []byte) {
	// Get to the  # spans and RLE in encoding
	spansEncoding := encoding[8:]
	var spans dvid.Spans
	if err := spans.UnmarshalBinary(spansEncoding); err != nil {
		t.Errorf("Error in decoding coarse sparse volume: %v\n", err)
		return
	}

	// Check those spans match the body voxels.
	if !reflect.DeepEqual(spans, b.blockSpans) {
		_, fn, line, _ := runtime.Caller(1)
		t.Errorf("Expected coarse spans for label %d:\n%s\nGot spans [%s:%d]:\n%s\n", b.label, b.blockSpans, fn, line, spans)
	}
}

// Makes sure the sparse volume encoding matches the actual body voxels.
func (b testBody) checkSparseVol(t *testing.T, encoding []byte, bounds dvid.OptionalBounds) {
	if len(encoding) < 12 {
		t.Fatalf("Bad encoded sparsevol received.  Only %d bytes\n", len(encoding))
	}

	// Get to the  # spans and RLE in encoding
	spansEncoding := encoding[8:]
	var spans dvid.Spans
	if err := spans.UnmarshalBinary(spansEncoding); err != nil {
		t.Fatalf("Error in decoding sparse volume: %v\n", err)
	}

	// Create potentially bounded spans
	expected := dvid.Spans{}
	if bounds.IsSet() {
		for _, span := range b.voxelSpans {
			if bounds.OutsideY(span[1]) || bounds.OutsideZ(span[0]) {
				continue
			}
			expected = append(expected, span)
		}
	} else {
		expected = b.voxelSpans
	}

	// Check those spans match the body voxels.
	gotNorm := spans.Normalize()
	expectNorm := expected.Normalize()
	if !reflect.DeepEqual(gotNorm, expectNorm) {
		for _, got := range gotNorm {
			bad := true
			for _, expect := range expectNorm {
				if reflect.DeepEqual(got, expect) {
					bad = false
				}
			}
			if bad {
				fmt.Printf("Got unexpected span: %s\n", got)
			}
		}
		for _, expect := range expectNorm {
			bad := true
			for _, got := range gotNorm {
				if reflect.DeepEqual(got, expect) {
					bad = false
				}
			}
			if bad {
				fmt.Printf("Never got expected span: %s\n", expect)
			}
		}
		_, fn, line, _ := runtime.Caller(1)
		t.Fatalf("Expected %d fine spans for label %d [%s:%d]:\n%s\nGot %d spans:\n%s\nAfter Norm:%s\n", len(expectNorm), b.label, fn, line, expectNorm, len(spans), spans, gotNorm)
	}
}

// Makes sure the sparse volume encoding matches a downres of actual body voxels.
func (b testBody) checkScaledSparseVol(t *testing.T, encoding []byte, scale uint8, bounds dvid.OptionalBounds) {
	if len(encoding) < 12 {
		t.Fatalf("Bad encoded sparsevol received.  Only %d bytes\n", len(encoding))
	}

	// Make down-res volume of body
	vol := newTestVolume(128, 128, 128)
	vol.addBody(b, 1)
	vol.downres(scale)

	// Get to the  # spans and RLE in encoding
	spansEncoding := encoding[8:]
	var spans dvid.Spans
	if err := spans.UnmarshalBinary(spansEncoding); err != nil {
		t.Fatalf("Error in decoding sparse volume: %v\n", err)
	}

	// Check those spans are within the body voxels.
	for _, span := range spans {
		z, y, x0, x1 := span.Unpack()
		if x1 >= vol.size[0] || y >= vol.size[1] || z >= vol.size[2] {
			t.Fatalf("Span %s is outside bound of scale %d volume of size %s\n", span, scale, vol.size)
		}
		pos := z*vol.size[0]*vol.size[1] + y*vol.size[0] + x0
		for x := x0; x <= x1; x++ {
			label := binary.LittleEndian.Uint64(vol.data[pos*8 : pos*8+8])
			if label != 1 {
				t.Fatalf("Received body at scale %d has voxel at (%d,%d,%d) but that voxel is label %d, not in body %d\n", scale, x, y, z, label, b.label)
				return
			}
			pos++
		}
	}
}

// checks use of binary blocks format
func (b testBody) checkBinarySparseVol(t *testing.T, r io.Reader) {
	binBlocks, err := labels.ReceiveBinaryBlocks(r)
	if err != nil {
		_, fn, line, _ := runtime.Caller(1)
		t.Fatalf("Error trying to decode binary blocks for body %d [%s:%d]: %v\n", b.label, fn, line, err)
	}

	expected := newTestVolume(128, 128, 128)
	expected.addBody(b, 1)

	got := newTestVolume(128, 128, 128)
	got.addBlocks(t, binBlocks, 1)

	if err := expected.equals(got); err != nil {
		_, fn, line, _ := runtime.Caller(1)
		t.Fatalf("error getting binary blocks for body %d [%s:%d]: %v\n", b.label, fn, line, err)
	}
}

// checks use of binary blocks format + scaling
func (b testBody) checkScaledBinarySparseVol(t *testing.T, r io.Reader, scale uint8) {
	binBlocks, err := labels.ReceiveBinaryBlocks(r)
	if err != nil {
		t.Fatalf("Error trying to decode binary blocks for body %d: %v\n", b.label, err)
	}

	expected := newTestVolume(128, 128, 128)
	expected.addBody(b, 1)
	expected.downres(scale)

	n := int32(128 >> scale)
	got := newTestVolume(n, n, n)
	got.addBlocks(t, binBlocks, 1)

	if err := expected.equals(got); err != nil {
		_, fn, line, _ := runtime.Caller(1)
		t.Fatalf("error getting binary blocks for body %d, scale %d [%s:%d]: %v\n", b.label, scale, fn, line, err)
	}
}

// Sees if the given block span has any of this test body label in it.
func (b testBody) isDeleted(t *testing.T, encoding []byte, bspan dvid.Span) bool {
	// Get to the  # spans and RLE in encoding
	spansEncoding := encoding[8:]
	var spans dvid.Spans
	if err := spans.UnmarshalBinary(spansEncoding); err != nil {
		t.Fatalf("Error in decoding sparse volume: %v\n", err)
		return false
	}

	// Iterate true spans to see if any are in the blocks given.
	for _, span := range spans {
		bx0 := span[2] / 32
		bx1 := span[3] / 32
		by := span[1] / 32
		bz := span[0] / 32

		within_x := (bx0 >= bspan[2] && bx0 <= bspan[3]) || (bx1 >= bspan[2] && bx1 <= bspan[3])
		if bz == bspan[0] && by == bspan[1] && within_x {
			return false
		}
	}
	return true
}

func checkSpans(t *testing.T, encoding []byte, minx, maxx int32) {
	// Get to the  # spans and RLE in encoding
	spansEncoding := encoding[8:]
	var spans dvid.Spans
	if err := spans.UnmarshalBinary(spansEncoding); err != nil {
		t.Errorf("Error in decoding coarse sparse volume: %v\n", err)
		return
	}
	for _, span := range spans {
		if span[2] < minx {
			t.Errorf("Found span violating min x %d: %s\n", minx, span)
			return
		}
		if span[3] > maxx {
			t.Errorf("Found span violating max x %d: %s\n", maxx, span)
		}
	}
}

// Sets voxels in body to given label.
func (v *testVolume) addBody(body testBody, label uint64) {
	nx := v.size[0]
	nxy := nx * v.size[1]
	for _, span := range body.voxelSpans {
		z, y, x0, x1 := span.Unpack()
		p := (z*nxy + y*nx) * 8
		for i := p + x0*8; i <= p+x1*8; i += 8 {
			binary.LittleEndian.PutUint64(v.data[i:i+8], label)
		}
	}
}

// Returns true if all voxels in test volume for given body has label.
func (v *testVolume) isLabel(label uint64, body *testBody) bool {
	nx := v.size[0]
	nxy := nx * v.size[1]
	for _, span := range body.voxelSpans {
		z, y, x0, x1 := span.Unpack()
		p := (z*nxy + y*nx) * 8
		for i := p + x0*8; i <= p+x1*8; i += 8 {
			curLabel := binary.LittleEndian.Uint64(v.data[i : i+8])
			if curLabel != label {
				return false
			}
		}
	}
	return true
}

// Returns true if any voxel in test volume has given label.
func (v *testVolume) hasLabel(label uint64, body *testBody) bool {
	nx := v.size[0]
	nxy := nx * v.size[1]
	for _, span := range body.voxelSpans {
		z, y, x0, x1 := span.Unpack()
		p := (z*nxy + y*nx) * 8
		for i := p + x0*8; i <= p+x1*8; i += 8 {
			curLabel := binary.LittleEndian.Uint64(v.data[i : i+8])
			if curLabel == label {
				return true
			}
		}
	}
	return false
}

func createLabelTestVolume(t *testing.T, uuid dvid.UUID, name string) *testVolume {
	// Setup test label blocks that are non-intersecting.
	volume := newTestVolume(128, 128, 128)
	volume.addBody(body1, 1)
	volume.addBody(body2, 2)
	volume.addBody(body3, 3)
	volume.addBody(body4, 4)

	// Send data over HTTP to populate a data instance
	volume.put(t, uuid, name)
	return volume
}

func createLabelTest2Volume(t *testing.T, uuid dvid.UUID, name string) *testVolume {
	// Setup test label blocks that are non-intersecting.
	volume := newTestVolume(128, 128, 128)
	volume.addBody(body6, 6)
	volume.addBody(body7, 7)

	// Send data over HTTP to populate a data instance using mutable flag
	volume.putMutable(t, uuid, name)
	return volume
}

func TestSparseVolumes(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("MaxDownresLevel", "2")
	config.Set("BlockSize", "32,32,32") // Previous test data was on 32^3 blocks
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)
	labelVol := createLabelTestVolume(t, uuid, "labels")

	gotVol := newTestVolume(128, 128, 128)
	gotVol.get(t, uuid, "labels")
	if err := gotVol.equals(labelVol); err != nil {
		t.Fatalf("Couldn't get back simple 128x128x128 label volume that was written: %v\n", err)
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on labels updating: %v\n", err)
	}
	if err := downres.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on update for labels: %v\n", err)
	}
	time.Sleep(1 * time.Second)

	dataservice, err := datastore.GetDataByUUIDName(uuid, "labels")
	if err != nil {
		t.Fatalf("couldn't get labels data instance from datastore: %v\n", err)
	}
	labels, ok := dataservice.(*Data)
	if !ok {
		t.Fatalf("Returned data instance for 'labels' instance was not labelarray.Data!\n")
	}
	if labels.MaxRepoLabel != 4 {
		t.Errorf("Expected max repo label to be 4, got %d\n", labels.MaxRepoLabel)
	}
	v, err := datastore.VersionFromUUID(uuid)
	if err != nil {
		t.Errorf("couldn't get version id from uuid %s: %v\n", uuid, err)
	}
	if len(labels.MaxLabel) != 1 || labels.MaxLabel[v] != 4 {
		t.Errorf("bad MaxLabels: %v\n", labels.MaxLabel)
	}
	maxLabelResp := server.TestHTTP(t, "GET", fmt.Sprintf("%snode/%s/labels/maxlabel", server.WebAPIPath, uuid), nil)
	if string(maxLabelResp) != `{"maxlabel": 4}` {
		t.Errorf("bad response to maxlabel endpoint: %s\n", string(maxLabelResp))
	}

	badReqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/0", server.WebAPIPath, uuid)
	server.TestBadHTTP(t, "GET", badReqStr, nil)

	for _, label := range []uint64{1, 2, 3, 4} {
		// Get the coarse sparse volumes for each label and make sure they are correct.
		reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol-coarse/%d", server.WebAPIPath, uuid, label)
		encoding := server.TestHTTP(t, "GET", reqStr, nil)
		bodies[label-1].checkCoarse(t, encoding)
	}

	reqStr := fmt.Sprintf("%snode/%s/labels/sparsevols-coarse/1/3", server.WebAPIPath, uuid)
	encoding := server.TestHTTP(t, "GET", reqStr, nil)
	checkSparsevolsCoarse(t, encoding)

	for _, label := range []uint64{1, 2, 3, 4} {
		// Check fast HEAD requests
		reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, label)
		resp := server.TestHTTPResponse(t, "HEAD", reqStr, nil)
		if resp.Code != http.StatusOK {
			t.Errorf("HEAD on %s did not return OK.  Status = %d\n", reqStr, resp.Code)
		}

		// Check full sparse volumes
		encoding = server.TestHTTP(t, "GET", reqStr, nil)
		lenEncoding := len(encoding)
		bodies[label-1].checkSparseVol(t, encoding, dvid.OptionalBounds{})

		// check one downres
		encoding = server.TestHTTP(t, "GET", reqStr+"?scale=1", nil)
		bodies[label-1].checkScaledSparseVol(t, encoding, 1, dvid.OptionalBounds{})

		// check two downres
		encoding = server.TestHTTP(t, "GET", reqStr+"?scale=2", nil)
		bodies[label-1].checkScaledSparseVol(t, encoding, 2, dvid.OptionalBounds{})

		// Check with lz4 compression
		uncompressed := make([]byte, lenEncoding)
		compressed := server.TestHTTP(t, "GET", reqStr+"?compression=lz4", nil)
		if err := lz4.Uncompress(compressed, uncompressed); err != nil {
			t.Fatalf("error uncompressing lz4 for sparsevol %d GET: %v\n", label, err)
		}
		bodies[label-1].checkSparseVol(t, uncompressed, dvid.OptionalBounds{})

		// Check with gzip compression
		compressed = server.TestHTTP(t, "GET", reqStr+"?compression=gzip", nil)
		b := bytes.NewBuffer(compressed)
		var err error
		r, err := gzip.NewReader(b)
		if err != nil {
			t.Fatalf("error creating gzip reader: %v\n", err)
		}
		var buffer bytes.Buffer
		_, err = io.Copy(&buffer, r)
		if err != nil {
			t.Fatalf("error copying gzip data: %v\n", err)
		}
		err = r.Close()
		if err != nil {
			t.Fatalf("error closing gzip: %v\n", err)
		}
		encoding = buffer.Bytes()
		bodies[label-1].checkSparseVol(t, encoding, dvid.OptionalBounds{})

		// // check sparse vol + scaling using binary blocks compression
		// reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d?format=blocks", server.WebAPIPath, uuid, label)
		// resp = server.TestHTTPResponse(t, "GET", reqStr, nil)
		// bodies[label-1].checkBinarySparseVol(t, resp.Body)

		// resp = server.TestHTTPResponse(t, "GET", reqStr+"?scale=1", nil)
		// bodies[label-1].checkScaledBinarySparseVol(t, resp.Body, 1)

		// resp = server.TestHTTPResponse(t, "GET", reqStr+"?scale=2", nil)
		// bodies[label-1].checkScaledBinarySparseVol(t, resp.Body, 2)

		// Check Y/Z restriction
		reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d?miny=30&maxy=50&minz=20&maxz=40", server.WebAPIPath, uuid, label)
		if label != 4 {
			encoding = server.TestHTTP(t, "GET", reqStr, nil)
			var bound dvid.OptionalBounds
			bound.SetMinY(30)
			bound.SetMaxY(50)
			bound.SetMinZ(20)
			bound.SetMaxZ(40)
			bodies[label-1].checkSparseVol(t, encoding, bound)
		} else {
			server.TestBadHTTP(t, "GET", reqStr, nil) // Should be not found
		}

		// Check X restriction
		minx := int32(20)
		maxx := int32(47)
		reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d?minx=%d&maxx=%d", server.WebAPIPath, uuid, label, minx, maxx)
		if label != 4 {
			encoding = server.TestHTTP(t, "GET", reqStr, nil)
			checkSpans(t, encoding, minx, maxx)
		} else {
			server.TestBadHTTP(t, "GET", reqStr, nil) // Should be not found
		}
	}

	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol-size/1", server.WebAPIPath, uuid)
	sizeResp := server.TestHTTP(t, "GET", reqStr, nil)
	if string(sizeResp) != `{"numblocks": 3, "minvoxel": [0, 32, 0], "maxvoxel": [31, 63, 95]}` {
		t.Errorf("bad response to sparsevol-size endpoint: %s\n", string(sizeResp))
	}

	// Make sure non-existent bodies return proper HEAD responses.
	headReq := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 10)
	resp := server.TestHTTPResponse(t, "HEAD", headReq, nil)
	if resp.Code != http.StatusNoContent {
		t.Errorf("HEAD on %s did not return 204 (No Content).  Status = %d\n", headReq, resp.Code)
	}
}

func Test16x16x16SparseVolumes(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("BlockSize", "16,16,16") // Since RLE encoding spans blocks now, should work for smaller block size.
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)
	labelVol := createLabelTestVolume(t, uuid, "labels")

	gotVol := newTestVolume(128, 128, 128)
	gotVol.get(t, uuid, "labels")
	if err := gotVol.equals(labelVol); err != nil {
		t.Fatalf("Couldn't get back simple 128x128x128 label volume that was written: %v\n", err)
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on labels updating: %v\n", err)
	}
	time.Sleep(1 * time.Second)

	for _, label := range []uint64{1, 2, 3, 4} {
		// Check fast HEAD requests
		reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, label)
		resp := server.TestHTTPResponse(t, "HEAD", reqStr, nil)
		if resp.Code != http.StatusOK {
			t.Errorf("HEAD on %s did not return OK.  Status = %d\n", reqStr, resp.Code)
		}

		// Check full sparse volumes
		encoding := server.TestHTTP(t, "GET", reqStr, nil)
		fmt.Printf("Got %d bytes back from %s\n", len(encoding), reqStr)
		bodies[label-1].checkSparseVol(t, encoding, dvid.OptionalBounds{})

		// Check with lz4 compression
		compressed := server.TestHTTP(t, "GET", reqStr+"?compression=lz4", nil)
		if err := lz4.Uncompress(compressed, encoding); err != nil {
			t.Fatalf("error uncompressing lz4: %v\n", err)
		}
		bodies[label-1].checkSparseVol(t, encoding, dvid.OptionalBounds{})

		// Check with gzip compression
		compressed = server.TestHTTP(t, "GET", reqStr+"?compression=gzip", nil)
		b := bytes.NewBuffer(compressed)
		var err error
		r, err := gzip.NewReader(b)
		if err != nil {
			t.Fatalf("error creating gzip reader: %v\n", err)
		}
		var buffer bytes.Buffer
		_, err = io.Copy(&buffer, r)
		if err != nil {
			t.Fatalf("error copying gzip data: %v\n", err)
		}
		err = r.Close()
		if err != nil {
			t.Fatalf("error closing gzip: %v\n", err)
		}
		encoding = buffer.Bytes()
		bodies[label-1].checkSparseVol(t, encoding, dvid.OptionalBounds{})

		// Check Y/Z restriction
		reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d?miny=30&maxy=50&minz=20&maxz=40", server.WebAPIPath, uuid, label)
		if label != 4 {
			encoding = server.TestHTTP(t, "GET", reqStr, nil)
			var bound dvid.OptionalBounds
			bound.SetMinY(30)
			bound.SetMaxY(50)
			bound.SetMinZ(20)
			bound.SetMaxZ(40)
			bodies[label-1].checkSparseVol(t, encoding, bound)
		} else {
			server.TestBadHTTP(t, "GET", reqStr, nil) // Should be not found
		}

		// Check X restriction
		minx := int32(20)
		maxx := int32(47)
		reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d?minx=%d&maxx=%d", server.WebAPIPath, uuid, label, minx, maxx)
		if label != 4 {
			encoding = server.TestHTTP(t, "GET", reqStr, nil)
			checkSpans(t, encoding, minx, maxx)
		} else {
			server.TestBadHTTP(t, "GET", reqStr, nil) // Should be not found
		}
	}

	// Make sure non-existent bodies return proper HEAD responses.
	headReq := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 10)
	resp := server.TestHTTPResponse(t, "HEAD", headReq, nil)
	if resp.Code != http.StatusNoContent {
		t.Errorf("HEAD on %s did not return 204 (No Content).  Status = %d\n", headReq, resp.Code)
	}
}

func TestMergeLabels(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	expected := createLabelTestVolume(t, uuid, "labels")
	expected.addBody(body3, 2)

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Make sure max label is consistent
	reqStr := fmt.Sprintf("%snode/%s/labels/maxlabel", server.WebAPIPath, uuid)
	r := server.TestHTTP(t, "GET", reqStr, nil)
	jsonVal := make(map[string]uint64)
	if err := json.Unmarshal(r, &jsonVal); err != nil {
		t.Errorf("Unable to get maxlabel from server.  Instead got: %v\n", jsonVal)
	}
	maxlabel, ok := jsonVal["maxlabel"]
	if !ok {
		t.Errorf("The maxlabel query did not yield max label.  Instead got: %v\n", jsonVal)
	}
	if maxlabel != 4 {
		t.Errorf("Expected max label to be 4, instead got %d\n", maxlabel)
	}

	// Test merge of 3 into 2
	testMerge := mergeJSON(`[2, 3]`)
	testMerge.send(t, uuid, "labels")

	// Make sure label 3 sparsevol has been removed.
	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 3)
	server.TestBadHTTP(t, "GET", reqStr, nil)

	// Make sure label changes are correct after completion
	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	retrieved := newTestVolume(128, 128, 128)
	retrieved.get(t, uuid, "labels")
	if len(retrieved.data) != 8*128*128*128 {
		t.Errorf("Retrieved labelvol volume is incorrect size\n")
	}
	if !retrieved.isLabel(2, &body2) {
		t.Errorf("Expected label 2 original voxels to remain.  Instead some were removed.\n")
	}
	if retrieved.hasLabel(3, &body3) {
		t.Errorf("Found label 3 when all label 3 should have been merged into label 2!\n")
	}
	if !retrieved.isLabel(2, &body3) {
		t.Errorf("Incomplete merging.  Label 2 should have taken over full extent of label 3\n")
	}
	if err := retrieved.equals(expected); err != nil {
		t.Errorf("Merged label volume: %v\n", err)
	}
}

func TestSplitCoarseLabel(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("BlockSize", "32,32,32") // Previous test data was on 32^3 blocks
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Post label volume and setup expected volume after split of block coords (2, 1, 1) and (2, 1, 2)
	expected := createLabelTestVolume(t, uuid, "labels")
	fromLabel := uint64(4)
	toLabel := uint64(5)
	nx := expected.size[0]
	nxy := nx * expected.size[1]
	var x, y, z int32
	for z = 0; z < 128; z++ {
		bz := z / 32
		if bz != 1 && bz != 2 {
			continue
		}
		for y = 0; y < 128; y++ {
			by := y / 32
			if by != 1 {
				continue
			}
			for x = 0; x < 128; x++ {
				bx := x / 32
				if (bz == 1 && bx == 2) || (bz == 2 && bx == 2) {
					i := (z*nxy + y*nx + x) * 8
					label := binary.LittleEndian.Uint64(expected.data[i : i+8])
					if label == fromLabel {
						binary.LittleEndian.PutUint64(expected.data[i:i+8], toLabel)
					}
				}
			}
		}
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Make sure sparsevol for original body 4 is correct
	reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 4)
	encoding := server.TestHTTP(t, "GET", reqStr, nil)
	fmt.Printf("Checking original body 4 is correct\n")
	body4.checkSparseVol(t, encoding, dvid.OptionalBounds{})

	// Create the encoding for split area in block coordinates.
	rles := dvid.RLEs{
		dvid.NewRLE(dvid.Point3d{2, 1, 1}, 1),
		dvid.NewRLE(dvid.Point3d{2, 1, 2}, 1),
	}
	buf := new(bytes.Buffer)
	buf.WriteByte(dvid.EncodingBinary)
	binary.Write(buf, binary.LittleEndian, uint8(3))  // # of dimensions
	binary.Write(buf, binary.LittleEndian, byte(0))   // dimension of run (X = 0)
	buf.WriteByte(byte(0))                            // reserved for later
	binary.Write(buf, binary.LittleEndian, uint32(0)) // Placeholder for # voxels
	binary.Write(buf, binary.LittleEndian, uint32(2)) // Placeholder for # spans
	rleBytes, err := rles.MarshalBinary()
	if err != nil {
		t.Errorf("Unable to serialize RLEs: %v\n", err)
	}
	buf.Write(rleBytes)

	// Submit the coarse split
	reqStr = fmt.Sprintf("%snode/%s/labels/split-coarse/%d", server.WebAPIPath, uuid, 4)
	r := server.TestHTTP(t, "POST", reqStr, buf)
	jsonVal := make(map[string]uint64)
	if err := json.Unmarshal(r, &jsonVal); err != nil {
		t.Errorf("Unable to get new label from split.  Instead got: %v\n", jsonVal)
	}
	newlabel, ok := jsonVal["label"]
	if !ok {
		t.Errorf("The split request did not yield label value.  Instead got: %v\n", jsonVal)
	}
	if newlabel != 5 {
		t.Errorf("Expected split label to be 5, instead got %d\n", newlabel)
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}
	maxLabelResp := server.TestHTTP(t, "GET", fmt.Sprintf("%snode/%s/labels/maxlabel", server.WebAPIPath, uuid), nil)
	if string(maxLabelResp) != `{"maxlabel": 5}` {
		t.Errorf("bad response to maxlabel endpoint: %s\n", string(maxLabelResp))
	}

	// Make sure labels are correct
	retrieved := newTestVolume(128, 128, 128)
	retrieved.get(t, uuid, "labels")
	if len(retrieved.data) != 8*128*128*128 {
		t.Errorf("Retrieved post-split volume is incorrect size\n")
	}
	if err := retrieved.equals(expected); err != nil {
		t.Errorf("Split label volume not equal to expected volume: %v\n", err)
	}

	// make sure the sparse volume for new label is correct
	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol-coarse/%d", server.WebAPIPath, uuid, toLabel)
	encoding = server.TestHTTP(t, "GET", reqStr, nil)
	if len(encoding) != len(rleBytes)+12 {
		t.Errorf("expected %d bytes from GET /sparsevol-coarse, got %d bytes\n", len(rleBytes)+12, len(encoding))
	}
	if len(encoding) < 12 {
		t.Fatalf("bad sparsevol-coarse encoding.  Expected at least 12 bytes, got %d\n", len(encoding))
	}
	numSpans := binary.LittleEndian.Uint32(encoding[8:12])
	if numSpans != 2 {
		t.Errorf("Expected 2 blocks, got %d blocks after split coarse.\n", numSpans)
	}
	coarseRLEs := new(dvid.RLEs)
	if err := coarseRLEs.UnmarshalBinary(encoding[12:]); err != nil {
		t.Fatalf("error unmarshaling coarse sparsevolume: %v\n", err)
	}
	if len(*coarseRLEs) != 2 {
		t.Fatalf("expected 2 blocks in sparsevol after split, got: %v\n", *coarseRLEs)
	}
	expectedRLEs := dvid.RLEs{dvid.NewRLE(dvid.Point3d{2, 1, 1}, 1), dvid.NewRLE(dvid.Point3d{2, 1, 2}, 1)}
	for i, rle := range *coarseRLEs {
		if !rle.StartPt().Equals(expectedRLEs[i].StartPt()) {
			t.Errorf("Bad block %d: expected %s, got %s\n", i, expectedRLEs[i], rle)
		}
	}
}

func TestSplitCoarseGivenLabel(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("BlockSize", "32,32,32") // Previous test data was on 32^3 blocks
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Post label volume and setup expected volume after split of block coords (2, 1, 1) and (3, 1, 2)
	expected := createLabelTestVolume(t, uuid, "labels")
	fromLabel := uint64(4)
	toLabel := uint64(8127)
	nx := expected.size[0]
	nxy := nx * expected.size[1]
	var x, y, z int32
	for z = 0; z < 128; z++ {
		bz := z / 32
		if bz != 1 && bz != 2 {
			continue
		}
		for y = 0; y < 128; y++ {
			by := y / 32
			if by != 1 {
				continue
			}
			for x = 0; x < 128; x++ {
				bx := x / 32
				if (bz == 1 && bx == 2) || (bz == 2 && bx == 2) {
					i := (z*nxy + y*nx + x) * 8
					label := binary.LittleEndian.Uint64(expected.data[i : i+8])
					if label == fromLabel {
						binary.LittleEndian.PutUint64(expected.data[i:i+8], toLabel)
					}
				}
			}
		}
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Create the encoding for split area in block coordinates.
	rles := dvid.RLEs{
		dvid.NewRLE(dvid.Point3d{2, 1, 1}, 1),
		dvid.NewRLE(dvid.Point3d{2, 1, 2}, 1),
	}
	buf := new(bytes.Buffer)
	buf.WriteByte(dvid.EncodingBinary)
	binary.Write(buf, binary.LittleEndian, uint8(3))  // # of dimensions
	binary.Write(buf, binary.LittleEndian, byte(0))   // dimension of run (X = 0)
	buf.WriteByte(byte(0))                            // reserved for later
	binary.Write(buf, binary.LittleEndian, uint32(0)) // Placeholder for # voxels
	binary.Write(buf, binary.LittleEndian, uint32(2)) // Placeholder for # spans
	rleBytes, err := rles.MarshalBinary()
	if err != nil {
		t.Errorf("Unable to serialize RLEs: %v\n", err)
	}
	buf.Write(rleBytes)

	// Submit the coarse split
	reqStr := fmt.Sprintf("%snode/%s/labels/split-coarse/%d?splitlabel=8127", server.WebAPIPath, uuid, 4)
	r := server.TestHTTP(t, "POST", reqStr, buf)
	jsonVal := make(map[string]uint64)
	if err := json.Unmarshal(r, &jsonVal); err != nil {
		t.Errorf("Unable to get new label from split.  Instead got: %v\n", jsonVal)
	}
	newlabel, ok := jsonVal["label"]
	if !ok {
		t.Errorf("The split request did not yield label value.  Instead got: %v\n", jsonVal)
	}
	if newlabel != 8127 {
		t.Errorf("Expected split label to be 8127, instead got %d\n", newlabel)
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	maxLabelResp := server.TestHTTP(t, "GET", fmt.Sprintf("%snode/%s/labels/maxlabel", server.WebAPIPath, uuid), nil)
	if string(maxLabelResp) != `{"maxlabel": 8127}` {
		t.Errorf("bad response to maxlabel endpoint: %s\n", string(maxLabelResp))
	}

	// Make sure labels are correct
	retrieved := newTestVolume(128, 128, 128)
	retrieved.get(t, uuid, "labels")
	if len(retrieved.data) != 8*128*128*128 {
		t.Errorf("Retrieved post-split volume is incorrect size\n")
	}
	if err := retrieved.equals(expected); err != nil {
		t.Errorf("Split label volume not equal to expected volume: %v\n", err)
	}

	// make sure the sparse volume for new label is correct
	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol-coarse/%d", server.WebAPIPath, uuid, toLabel)
	encoding := server.TestHTTP(t, "GET", reqStr, nil)
	if len(encoding) != len(rleBytes)+12 {
		t.Errorf("expected %d bytes from GET /sparsevol-coarse, got %d bytes\n", len(rleBytes)+12, len(encoding))
	}
	if len(encoding) < 12 {
		t.Fatalf("bad sparsevol-coarse encoding.  Expected at least 12 bytes, got %d\n", len(encoding))
	}
	numSpans := binary.LittleEndian.Uint32(encoding[8:12])
	if numSpans != 2 {
		t.Errorf("Expected 2 blocks, got %d blocks after split coarse.\n", numSpans)
	}
	coarseRLEs := new(dvid.RLEs)
	if err := coarseRLEs.UnmarshalBinary(encoding[12:]); err != nil {
		t.Fatalf("error unmarshaling coarse sparsevolume: %v\n", err)
	}
	if len(*coarseRLEs) != 2 {
		t.Fatalf("expected 2 blocks in sparsevol after split, got: %v\n", *coarseRLEs)
	}
	expectedRLEs := dvid.RLEs{dvid.NewRLE(dvid.Point3d{2, 1, 1}, 1), dvid.NewRLE(dvid.Point3d{2, 1, 2}, 1)}
	for i, rle := range *coarseRLEs {
		if !rle.StartPt().Equals(expectedRLEs[i].StartPt()) {
			t.Errorf("Bad block %d: expected %s, got %s\n", i, expectedRLEs[i], rle)
		}
	}
}

func TestSplitLabel(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("BlockSize", "32,32,32") // Previous test data was on 32^3 blocks
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Post label volume and setup expected volume after split.
	expected := createLabelTestVolume(t, uuid, "labels")
	expected.addBody(bodysplit, 5)

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Make sure sparsevol for original body 4 is correct
	reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 4)
	encoding := server.TestHTTP(t, "GET", reqStr, nil)
	fmt.Printf("Checking original body 4 is correct\n")
	body4.checkSparseVol(t, encoding, dvid.OptionalBounds{})

	// Create the sparsevol encoding for split area
	numspans := len(bodysplit.voxelSpans)
	rles := make(dvid.RLEs, numspans, numspans)
	for i, span := range bodysplit.voxelSpans {
		start := dvid.Point3d{span[2], span[1], span[0]}
		length := span[3] - span[2] + 1
		rles[i] = dvid.NewRLE(start, length)
	}

	// Create the split sparse volume binary
	buf := new(bytes.Buffer)
	buf.WriteByte(dvid.EncodingBinary)
	binary.Write(buf, binary.LittleEndian, uint8(3))         // # of dimensions
	binary.Write(buf, binary.LittleEndian, byte(0))          // dimension of run (X = 0)
	buf.WriteByte(byte(0))                                   // reserved for later
	binary.Write(buf, binary.LittleEndian, uint32(0))        // Placeholder for # voxels
	binary.Write(buf, binary.LittleEndian, uint32(numspans)) // Placeholder for # spans
	rleBytes, err := rles.MarshalBinary()
	if err != nil {
		t.Errorf("Unable to serialize RLEs: %v\n", err)
	}
	buf.Write(rleBytes)

	// Verify the max label is 4
	reqStr = fmt.Sprintf("%snode/%s/labels/maxlabel", server.WebAPIPath, uuid)
	jsonStr := server.TestHTTP(t, "GET", reqStr, nil)
	expectedJSON := `{"maxlabel": 4}`
	if string(jsonStr) != expectedJSON {
		t.Errorf("Expected this JSON returned from maxlabel:\n%s\nGot:\n%s\n", expectedJSON, string(jsonStr))
	}

	// Submit the split sparsevol for body 4 using RLES "bodysplit"
	reqStr = fmt.Sprintf("%snode/%s/labels/split/%d", server.WebAPIPath, uuid, 4)
	r := server.TestHTTP(t, "POST", reqStr, buf)
	jsonVal := make(map[string]uint64)
	if err := json.Unmarshal(r, &jsonVal); err != nil {
		t.Errorf("Unable to get new label from split.  Instead got: %v\n", jsonVal)
	}
	newlabel, ok := jsonVal["label"]
	if !ok {
		t.Errorf("The split request did not yield label value.  Instead got: %v\n", jsonVal)
	}
	if newlabel != 5 {
		t.Errorf("Expected split label to be 5, instead got %d\n", newlabel)
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	retrieved := newTestVolume(128, 128, 128)
	retrieved.get(t, uuid, "labels")
	if len(retrieved.data) != 8*128*128*128 {
		t.Errorf("Retrieved post-split volume is incorrect size\n")
	}
	if err := retrieved.equals(expected); err != nil {
		t.Errorf("Split label volume not equal to expected volume: %v\n", err)
	}

	// Check split body 5 usine legacy RLEs
	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 5)
	encoding = server.TestHTTP(t, "GET", reqStr, nil)
	bodysplit.checkSparseVol(t, encoding, dvid.OptionalBounds{})

	// Make sure sparsevol for original body 4 is correct
	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 4)
	encoding = server.TestHTTP(t, "GET", reqStr, nil)
	bodyleft.checkSparseVol(t, encoding, dvid.OptionalBounds{})

	// Do a merge of two after the split
	testMerge := mergeJSON(`[4, 5]`)
	testMerge.send(t, uuid, "labels")

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on bodies update: %v\n", err)
	}

	// Make sure we wind up with original body 4
	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/4", server.WebAPIPath, uuid)
	encoding = server.TestHTTP(t, "GET", reqStr, nil)
	body4.checkSparseVol(t, encoding, dvid.OptionalBounds{})
}

// Same as TestSplitLabel but now designate the actual split label
func TestSplitGivenLabel(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("BlockSize", "32,32,32") // Previous test data was on 32^3 blocks
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Post label volume and setup expected volume after split.
	expected := createLabelTestVolume(t, uuid, "labels")
	expected.addBody(bodyleft, 4)
	expected.addBody(bodysplit, 23)

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Create the sparsevol encoding for split area
	numspans := len(bodysplit.voxelSpans)
	rles := make(dvid.RLEs, numspans, numspans)
	for i, span := range bodysplit.voxelSpans {
		start := dvid.Point3d{span[2], span[1], span[0]}
		length := span[3] - span[2] + 1
		rles[i] = dvid.NewRLE(start, length)
	}

	// Create the split sparse volume binary
	buf := new(bytes.Buffer)
	buf.WriteByte(dvid.EncodingBinary)
	binary.Write(buf, binary.LittleEndian, uint8(3))         // # of dimensions
	binary.Write(buf, binary.LittleEndian, byte(0))          // dimension of run (X = 0)
	buf.WriteByte(byte(0))                                   // reserved for later
	binary.Write(buf, binary.LittleEndian, uint32(0))        // Placeholder for # voxels
	binary.Write(buf, binary.LittleEndian, uint32(numspans)) // Placeholder for # spans
	rleBytes, err := rles.MarshalBinary()
	if err != nil {
		t.Errorf("Unable to serialize RLEs: %v\n", err)
	}
	buf.Write(rleBytes)

	// Submit the split sparsevol for body 4a
	reqStr := fmt.Sprintf("%snode/%s/labels/split/%d?splitlabel=23", server.WebAPIPath, uuid, 4)
	r := server.TestHTTP(t, "POST", reqStr, buf)
	jsonVal := make(map[string]uint64)
	if err := json.Unmarshal(r, &jsonVal); err != nil {
		t.Errorf("Unable to get new label from split.  Instead got: %v\n", jsonVal)
	}
	newlabel, ok := jsonVal["label"]
	if !ok {
		t.Errorf("The split request did not yield label value.  Instead got: %v\n", jsonVal)
	}
	if newlabel != 23 {
		t.Errorf("Expected split label to be assigned label 23, instead got %d\n", newlabel)
	}
}

func TestMergeSplitLabel(t *testing.T) {
	if err := server.OpenTest(); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("BlockSize", "32,32,32") // Previous test data was on 32^3 blocks
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Post standard label 1-4 volume
	expected := createLabelTestVolume(t, uuid, "labels")

	// Get expected volume if we add label 3 to 4.
	expected.addBody(body3, 4)

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Test merge of 3 into 4
	testMerge := mergeJSON(`[4, 3]`)
	testMerge.send(t, uuid, "labels")

	// Make sure label changes are correct after completion
	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Make sure label 3 sparsevol has been removed.
	reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 3)
	server.TestBadHTTP(t, "GET", reqStr, nil)

	retrieved := newTestVolume(128, 128, 128)
	retrieved.get(t, uuid, "labels")
	if len(retrieved.data) != 8*128*128*128 {
		t.Errorf("Retrieved labelvol volume is incorrect size\n")
	}
	if !retrieved.isLabel(2, &body2) {
		t.Errorf("Expected label 2 original voxels to remain.  Instead some were removed.\n")
	}
	if retrieved.hasLabel(3, &body3) {
		t.Errorf("Found label 3 when all label 3 should have been merged into label 4!\n")
	}
	if !retrieved.isLabel(4, &body3) {
		t.Errorf("Incomplete merging.  Label 4 should have taken over full extent of label 3\n")
	}
	if err := retrieved.equals(expected); err != nil {
		t.Errorf("Merged label volume not equal to expected merged volume: %v\n", err)
	}

	// Create the sparsevol encoding for split area of 4
	numspans := len(bodysplit.voxelSpans)
	rles := make(dvid.RLEs, numspans, numspans)
	for i, span := range bodysplit.voxelSpans {
		start := dvid.Point3d{span[2], span[1], span[0]}
		length := span[3] - span[2] + 1
		rles[i] = dvid.NewRLE(start, length)
	}

	// Create the split sparse volume binary
	buf := new(bytes.Buffer)
	buf.WriteByte(dvid.EncodingBinary)
	binary.Write(buf, binary.LittleEndian, uint8(3))         // # of dimensions
	binary.Write(buf, binary.LittleEndian, byte(0))          // dimension of run (X = 0)
	buf.WriteByte(byte(0))                                   // reserved for later
	binary.Write(buf, binary.LittleEndian, uint32(0))        // Placeholder for # voxels
	binary.Write(buf, binary.LittleEndian, uint32(numspans)) // Placeholder for # spans
	rleBytes, err := rles.MarshalBinary()
	if err != nil {
		t.Errorf("Unable to serialize RLEs: %v\n", err)
	}
	buf.Write(rleBytes)

	// Verify the max label is 4
	reqStr = fmt.Sprintf("%snode/%s/labels/maxlabel", server.WebAPIPath, uuid)
	jsonStr := server.TestHTTP(t, "GET", reqStr, nil)
	expectedJSON := `{"maxlabel": 4}`
	if string(jsonStr) != expectedJSON {
		t.Errorf("Expected this JSON returned from maxlabel:\n%s\nGot:\n%s\n", expectedJSON, string(jsonStr))
	}

	// Submit the split sparsevol for body 4a (-> 5)
	reqStr = fmt.Sprintf("%snode/%s/labels/split/4", server.WebAPIPath, uuid)
	r := server.TestHTTP(t, "POST", reqStr, buf)
	jsonVal := make(map[string]uint64)
	if err := json.Unmarshal(r, &jsonVal); err != nil {
		t.Errorf("Unable to get new label from split.  Instead got: %v\n", jsonVal)
	}
	newlabel, ok := jsonVal["label"]
	if !ok {
		t.Errorf("The split request did not yield label value.  Instead got: %v\n", jsonVal)
	}
	if newlabel != 5 {
		t.Errorf("Expected split label to be 5, instead got %d\n", newlabel)
	}

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	retrieved = newTestVolume(128, 128, 128)
	retrieved.get(t, uuid, "labels")
	if len(retrieved.data) != 8*128*128*128 {
		t.Errorf("Retrieved post-split volume is incorrect size\n")
	}
	expected.addBody(bodysplit, 5)
	if err := retrieved.equals(expected); err != nil {
		t.Errorf("Split label volume not equal to expected volume: %v\n", err)
	}

	// Make sure new body 5 is what we sent
	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, 5)
	encoding := server.TestHTTP(t, "GET", reqStr, nil)
	bodysplit.checkSparseVol(t, encoding, dvid.OptionalBounds{})
}

func TestMultiscaleMergeSplit(t *testing.T) {
	testConfig := server.TestConfig{CacheSize: map[string]int{"labelarray": 10}}
	// var testConfig server.TestConfig
	if err := server.OpenTest(testConfig); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume
	uuid, _ := initTestRepo()
	var config dvid.Config
	config.Set("MaxDownresLevel", "2")
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Create an easily interpreted label volume with a couple of labels.
	volume := newTestVolume(128, 128, 128)
	volume.addSubvol(dvid.Point3d{40, 40, 40}, dvid.Point3d{40, 40, 40}, 1)
	volume.addSubvol(dvid.Point3d{40, 40, 80}, dvid.Point3d{40, 40, 40}, 2)
	volume.addSubvol(dvid.Point3d{80, 40, 40}, dvid.Point3d{40, 40, 40}, 13)
	volume.addSubvol(dvid.Point3d{40, 80, 40}, dvid.Point3d{40, 40, 40}, 209)
	volume.addSubvol(dvid.Point3d{80, 80, 40}, dvid.Point3d{40, 40, 40}, 311)
	volume.put(t, uuid, "labels")

	// Verify initial ingest for hi-res
	if err := downres.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on update for labels: %v\n", err)
	}
	hires := newTestVolume(128, 128, 128)
	hires.get(t, uuid, "labels")
	hires.verifyLabel(t, 1, 45, 45, 45)
	hires.verifyLabel(t, 2, 50, 50, 100)
	hires.verifyLabel(t, 13, 100, 60, 60)
	hires.verifyLabel(t, 209, 55, 100, 55)
	hires.verifyLabel(t, 311, 81, 81, 41)

	// Check the first downres: 64^3
	downres1 := newTestVolume(64, 64, 64)
	downres1.getScale(t, uuid, "labels", 1)
	downres1.verifyLabel(t, 0, 35, 34, 2)
	downres1.verifyLabel(t, 1, 30, 30, 30)
	downres1.verifyLabel(t, 2, 21, 21, 45)
	downres1.verifyLabel(t, 13, 45, 21, 36)
	downres1.verifyLabel(t, 209, 21, 50, 35)
	downres1.verifyLabel(t, 311, 45, 55, 35)
	expected1 := newTestVolume(64, 64, 64)
	expected1.addSubvol(dvid.Point3d{20, 20, 20}, dvid.Point3d{20, 20, 20}, 1)
	expected1.addSubvol(dvid.Point3d{20, 20, 40}, dvid.Point3d{20, 20, 20}, 2)
	expected1.addSubvol(dvid.Point3d{40, 20, 20}, dvid.Point3d{20, 20, 20}, 13)
	expected1.addSubvol(dvid.Point3d{20, 40, 20}, dvid.Point3d{20, 20, 20}, 209)
	expected1.addSubvol(dvid.Point3d{40, 40, 20}, dvid.Point3d{20, 20, 20}, 311)
	if err := expected1.equals(downres1); err != nil {
		t.Errorf("1st downres isn't what is expected: %v\n", err)
	}

	// Check the second downres to voxel: 32^3
	downres2 := newTestVolume(32, 32, 32)
	downres2.getScale(t, uuid, "labels", 2)
	downres2.verifyLabel(t, 0, 15, 16, 2)
	expected2 := newTestVolume(32, 32, 32)
	expected2.addSubvol(dvid.Point3d{10, 10, 10}, dvid.Point3d{10, 10, 10}, 1)
	expected2.addSubvol(dvid.Point3d{10, 10, 20}, dvid.Point3d{10, 10, 10}, 2)
	expected2.addSubvol(dvid.Point3d{20, 10, 10}, dvid.Point3d{10, 10, 10}, 13)
	expected2.addSubvol(dvid.Point3d{10, 20, 10}, dvid.Point3d{10, 10, 10}, 209)
	expected2.addSubvol(dvid.Point3d{20, 20, 10}, dvid.Point3d{10, 10, 10}, 311)
	if err := expected2.equals(downres2); err != nil {
		t.Errorf("2nd downres isn't what is expected: %v\n", err)
	}

	// Test merge of 2 and 13 into 1
	testMerge := mergeJSON(`[1, 2, 13]`)
	testMerge.send(t, uuid, "labels")

	// Make sure labels 2 and 13 sparsevol has been removed.
	reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/2", server.WebAPIPath, uuid)
	server.TestBadHTTP(t, "GET", reqStr, nil)

	reqStr = fmt.Sprintf("%snode/%s/labels/sparsevol/13", server.WebAPIPath, uuid)
	server.TestBadHTTP(t, "GET", reqStr, nil)

	// Make sure label changes are correct after completion of merge
	if err := downres.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on update for labels: %v\n", err)
	}
	retrieved := newTestVolume(128, 128, 128)
	retrieved.get(t, uuid, "labels")
	merged := newTestVolume(128, 128, 128)
	merged.addSubvol(dvid.Point3d{40, 40, 40}, dvid.Point3d{40, 40, 40}, 1)
	merged.addSubvol(dvid.Point3d{40, 40, 80}, dvid.Point3d{40, 40, 40}, 1)
	merged.addSubvol(dvid.Point3d{80, 40, 40}, dvid.Point3d{40, 40, 40}, 1)
	merged.addSubvol(dvid.Point3d{40, 80, 40}, dvid.Point3d{40, 40, 40}, 209)
	merged.addSubvol(dvid.Point3d{80, 80, 40}, dvid.Point3d{40, 40, 40}, 311)
	if err := merged.equals(retrieved); err != nil {
		t.Errorf("Merged label volume not equal to expected merged volume: %v\n", err)
	}

	retrieved1 := newTestVolume(64, 64, 64)
	retrieved1.getScale(t, uuid, "labels", 1)
	retrieved1.verifyLabel(t, 0, 35, 34, 2)
	merged1 := newTestVolume(64, 64, 64)
	merged1.addSubvol(dvid.Point3d{20, 20, 20}, dvid.Point3d{20, 20, 20}, 1)
	merged1.addSubvol(dvid.Point3d{20, 20, 40}, dvid.Point3d{20, 20, 20}, 1)
	merged1.addSubvol(dvid.Point3d{40, 20, 20}, dvid.Point3d{20, 20, 20}, 1)
	merged1.addSubvol(dvid.Point3d{20, 40, 20}, dvid.Point3d{20, 20, 20}, 209)
	merged1.addSubvol(dvid.Point3d{40, 40, 20}, dvid.Point3d{20, 20, 20}, 311)
	if err := retrieved1.equals(merged1); err != nil {
		t.Errorf("Merged label volume downres #1 not equal to expected merged volume: %v\n", err)
	}

	retrieved2 := newTestVolume(32, 32, 32)
	retrieved2.getScale(t, uuid, "labels", 2)
	merged2 := newTestVolume(32, 32, 32)
	merged2.addSubvol(dvid.Point3d{10, 10, 10}, dvid.Point3d{10, 10, 10}, 1)
	merged2.addSubvol(dvid.Point3d{10, 10, 20}, dvid.Point3d{10, 10, 10}, 1)
	merged2.addSubvol(dvid.Point3d{20, 10, 10}, dvid.Point3d{10, 10, 10}, 1)
	merged2.addSubvol(dvid.Point3d{10, 20, 10}, dvid.Point3d{10, 10, 10}, 209)
	merged2.addSubvol(dvid.Point3d{20, 20, 10}, dvid.Point3d{10, 10, 10}, 311)
	if err := retrieved2.equals(merged2); err != nil {
		t.Errorf("Merged label volume downres #2 not equal to expected merged volume: %v\n", err)
	}

	// Create the sparsevol encoding for split area that used to be body 13
	numspans := 40 * 40
	rles := make(dvid.RLEs, numspans, numspans)
	length := int32(40)
	i := 0
	for z := int32(40); z < 80; z++ {
		for y := int32(40); y < 80; y++ {
			start := dvid.Point3d{80, y, z}
			rles[i] = dvid.NewRLE(start, length)
			i++
		}
	}

	// Create the split sparse volume binary
	buf := new(bytes.Buffer)
	buf.WriteByte(dvid.EncodingBinary)
	binary.Write(buf, binary.LittleEndian, uint8(3))            // # of dimensions
	binary.Write(buf, binary.LittleEndian, byte(0))             // dimension of run (X = 0)
	buf.WriteByte(byte(0))                                      // reserved for later
	binary.Write(buf, binary.LittleEndian, uint32(numspans*40)) // Placeholder for # voxels
	binary.Write(buf, binary.LittleEndian, uint32(numspans))    // Placeholder for # spans
	rleBytes, err := rles.MarshalBinary()
	if err != nil {
		t.Errorf("Unable to serialize RLEs: %v\n", err)
	}
	buf.Write(rleBytes)

	// Submit the split sparsevol and assign to label 28
	reqStr = fmt.Sprintf("%snode/%s/labels/split/1?splitlabel=28", server.WebAPIPath, uuid)
	r := server.TestHTTP(t, "POST", reqStr, buf)
	jsonVal := make(map[string]uint64)
	if err := json.Unmarshal(r, &jsonVal); err != nil {
		t.Errorf("Unable to get new label from split.  Instead got: %v\n", jsonVal)
	}

	// Test all the multiscales for correct split volume.

	// Make sure label changes are correct after completion of merge
	if err := downres.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of split of labels: %v\n", err)
	}
	retrieved.get(t, uuid, "labels")
	split := newTestVolume(128, 128, 128)
	split.addSubvol(dvid.Point3d{40, 40, 40}, dvid.Point3d{40, 40, 40}, 1)
	split.addSubvol(dvid.Point3d{40, 40, 80}, dvid.Point3d{40, 40, 40}, 1)
	split.addSubvol(dvid.Point3d{80, 40, 40}, dvid.Point3d{40, 40, 40}, 28)
	split.addSubvol(dvid.Point3d{40, 80, 40}, dvid.Point3d{40, 40, 40}, 209)
	split.addSubvol(dvid.Point3d{80, 80, 40}, dvid.Point3d{40, 40, 40}, 311)
	if err := retrieved.equals(split); err != nil {
		t.Errorf("Split label volume not equal to expected split volume: %v\n", err)
	}

	retrieved1.getScale(t, uuid, "labels", 1)
	retrieved1.verifyLabel(t, 0, 35, 34, 2)
	split1 := newTestVolume(64, 64, 64)
	split1.addSubvol(dvid.Point3d{20, 20, 20}, dvid.Point3d{20, 20, 20}, 1)
	split1.addSubvol(dvid.Point3d{20, 20, 40}, dvid.Point3d{20, 20, 20}, 1)
	split1.addSubvol(dvid.Point3d{40, 20, 20}, dvid.Point3d{20, 20, 20}, 28)
	split1.addSubvol(dvid.Point3d{20, 40, 20}, dvid.Point3d{20, 20, 20}, 209)
	split1.addSubvol(dvid.Point3d{40, 40, 20}, dvid.Point3d{20, 20, 20}, 311)
	split1.verifyLabel(t, 0, 35, 34, 2)
	if err := retrieved1.equals(split1); err != nil {
		t.Errorf("Split label volume downres #1 not equal to expected split volume: %v\n", err)
	}

	retrieved2.getScale(t, uuid, "labels", 2)
	split2 := newTestVolume(32, 32, 32)
	split2.addSubvol(dvid.Point3d{10, 10, 10}, dvid.Point3d{10, 10, 10}, 1)
	split2.addSubvol(dvid.Point3d{10, 10, 20}, dvid.Point3d{10, 10, 10}, 1)
	split2.addSubvol(dvid.Point3d{20, 10, 10}, dvid.Point3d{10, 10, 10}, 28)
	split2.addSubvol(dvid.Point3d{10, 20, 10}, dvid.Point3d{10, 10, 10}, 209)
	split2.addSubvol(dvid.Point3d{20, 20, 10}, dvid.Point3d{10, 10, 10}, 311)
	if err := retrieved2.equals(split2); err != nil {
		t.Errorf("Split label volume downres #2 not equal to expected split volume: %v\n", err)
	}
}

// Test that mutable labelarray POST will accurately remove prior bodies.
func TestMutableLabelblkPOST(t *testing.T) {
	testConfig := server.TestConfig{CacheSize: map[string]int{"labelarray": 10}}
	// var testConfig server.TestConfig
	if err := server.OpenTest(testConfig); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Post labels 1-4
	createLabelTestVolume(t, uuid, "labels")

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Make sure we have labels 1-4 sparsevol
	for _, label := range []uint64{1, 2, 3, 4} {
		// Check fast HEAD requests
		reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, label)
		resp := server.TestHTTPResponse(t, "HEAD", reqStr, nil)
		if resp.Code != http.StatusOK {
			t.Errorf("HEAD on %s did not return OK.  Status = %d\n", reqStr, resp.Code)
		}

		// Check full sparse volumes
		encoding := server.TestHTTP(t, "GET", reqStr, nil)
		bodies[label-1].checkSparseVol(t, encoding, dvid.OptionalBounds{})
	}

	// Post labels 6-7
	createLabelTest2Volume(t, uuid, "labels")

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	// Make sure that labels 1-4 have no more sparse vol.
	for _, label := range []uint64{1, 2, 3, 4} {
		// Check full sparse volumes aren't retrievable anymore
		reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, label)
		server.TestBadHTTP(t, "GET", reqStr, nil)

		// Make sure non-existent bodies return proper HEAD responses.
		resp := server.TestHTTPResponse(t, "HEAD", reqStr, nil)
		if resp.Code != http.StatusNoContent {
			t.Errorf("HEAD on %s did not return 204 (No Content).  Status = %d\n", reqStr, resp.Code)
		}
	}

	// Make sure labels 6-7 are available as sparse vol.
	for _, label := range []uint64{6, 7} {
		// Check fast HEAD requests
		reqStr := fmt.Sprintf("%snode/%s/labels/sparsevol/%d", server.WebAPIPath, uuid, label)
		resp := server.TestHTTPResponse(t, "HEAD", reqStr, nil)
		if resp.Code != http.StatusOK {
			t.Errorf("HEAD on %s did not return OK.  Status = %d\n", reqStr, resp.Code)
		}

		// Check full sparse volumes
		encoding := server.TestHTTP(t, "GET", reqStr, nil)
		bodies[label-1].checkSparseVol(t, encoding, dvid.OptionalBounds{})
	}
}

func TestConcurrentMutations(t *testing.T) {
	testConfig := server.TestConfig{CacheSize: map[string]int{"labelarray": 10}}
	// var testConfig server.TestConfig
	if err := server.OpenTest(testConfig); err != nil {
		t.Fatalf("can't open test server: %v\n", err)
	}
	defer server.CloseTest()

	// Create testbed volume and data instances
	uuid, _ := initTestRepo()
	var config dvid.Config // use native 64^3 blocks
	server.CreateTestInstance(t, uuid, "labelarray", "labels", config)

	// Make three parallel bodies that are within same blocks to test handling of concurrent
	// ops on same blocks.
	tbody1 := testBody{ // 72 x 4 x 4 horizontal bar
		label:  1,
		offset: dvid.Point3d{9, 68, 68},
		size:   dvid.Point3d{72, 4, 4},
		blockSpans: []dvid.Span{
			{1, 1, 0, 1},
		},
		voxelSpans: []dvid.Span{
			{68, 68, 9, 80},
			{68, 69, 9, 80},
			{68, 70, 9, 80},
			{68, 71, 9, 80},
			{69, 68, 9, 80},
			{69, 69, 9, 80},
			{69, 70, 9, 80},
			{69, 71, 9, 80},
			{70, 68, 9, 80},
			{70, 69, 9, 80},
			{70, 70, 9, 80},
			{70, 71, 9, 80},
			{71, 68, 9, 80},
			{71, 69, 9, 80},
			{71, 70, 9, 80},
			{71, 71, 9, 80},
		},
	}
	tbody2 := testBody{ // 72 x 4 x 4 horizontal bar
		label:  2,
		offset: dvid.Point3d{9, 68, 72},
		size:   dvid.Point3d{72, 4, 4},
		blockSpans: []dvid.Span{
			{1, 1, 0, 1},
		},
		voxelSpans: []dvid.Span{
			{72, 68, 9, 80},
			{72, 69, 9, 80},
			{72, 70, 9, 80},
			{72, 71, 9, 80},
			{73, 68, 9, 80},
			{73, 69, 9, 80},
			{73, 70, 9, 80},
			{73, 71, 9, 80},
			{74, 68, 9, 80},
			{74, 69, 9, 80},
			{74, 70, 9, 80},
			{74, 71, 9, 80},
			{75, 68, 9, 80},
			{75, 69, 9, 80},
			{75, 70, 9, 80},
			{75, 71, 9, 80},
		},
	}
	tbody3 := testBody{ // 72 x 4 x 4 horizontal bar
		label:  3,
		offset: dvid.Point3d{9, 68, 76},
		size:   dvid.Point3d{72, 4, 4},
		blockSpans: []dvid.Span{
			{1, 1, 0, 1},
		},
		voxelSpans: []dvid.Span{
			{76, 68, 9, 80},
			{76, 69, 9, 80},
			{76, 70, 9, 80},
			{76, 71, 9, 80},
			{77, 68, 9, 80},
			{77, 69, 9, 80},
			{77, 70, 9, 80},
			{77, 71, 9, 80},
			{78, 68, 9, 80},
			{78, 69, 9, 80},
			{78, 70, 9, 80},
			{78, 71, 9, 80},
			{79, 68, 9, 80},
			{79, 69, 9, 80},
			{79, 70, 9, 80},
			{79, 71, 9, 80},
		},
	}
	testbodies := [3]testBody{tbody1, tbody2, tbody3}

	tvol := newTestVolume(192, 128, 128)
	tvol.addBody(tbody1, 1)
	tvol.addBody(tbody2, 2)
	tvol.addBody(tbody3, 3)
	tvol.put(t, uuid, "labels")

	if err := datastore.BlockOnUpdating(uuid, "labels"); err != nil {
		t.Fatalf("Error blocking on sync of labels: %v\n", err)
	}

	retrieved := newTestVolume(192, 128, 128)
	retrieved.get(t, uuid, "labels")
	if len(retrieved.data) != 8*192*128*128 {
		t.Errorf("Retrieved labelvol volume is incorrect size\n")
	}
	if err := retrieved.equals(tvol); err != nil {
		t.Errorf("Initial put not working: %v\n", err)
	}

	// Run concurrent split/merge ops on each body where split is random location in X.
	wg := new(sync.WaitGroup)
	wg.Add(3)
	go func() {
		for n := 0; n < 30; n++ {
			tbody1.splitmerge(t, uuid, "labels")
		}
		wg.Done()
	}()
	go func() {
		for n := 0; n < 30; n++ {
			tbody2.splitmerge(t, uuid, "labels")
		}
		wg.Done()
	}()
	go func() {
		for n := 0; n < 30; n++ {
			tbody3.splitmerge(t, uuid, "labels")
		}
		wg.Done()
	}()
	wg.Wait()

	retrieved2 := newTestVolume(192, 128, 128)
	retrieved2.get(t, uuid, "labels")
	if len(retrieved2.data) != 8*192*128*128 {
		t.Errorf("Retrieved labelvol volume is incorrect size\n")
	}
	if err := retrieved2.equals(tvol); err != nil {
		t.Errorf("Concurrent split/merge producing bad result: %v\n", err)
	}

	reqStr := fmt.Sprintf("%snode/%s/labels/sparsevols-coarse/1/3", server.WebAPIPath, uuid)
	encoding := server.TestHTTP(t, "GET", reqStr, nil)
	var i int
	for label := uint64(1); label <= 3; label++ {
		if i+28 > len(encoding) {
			t.Fatalf("Expected label %d but only %d bytes remain in encoding\n", label, len(encoding[i:]))
		}
		gotLabel := binary.LittleEndian.Uint64(encoding[i : i+8])
		if gotLabel != label {
			t.Errorf("Expected label %d, got label %d in returned coarse sparsevols\n", label, gotLabel)
		}
		i += 8
		var spans dvid.Spans
		if err := spans.UnmarshalBinary(encoding[i:]); err != nil {
			t.Errorf("Error in decoding coarse sparse volume: %v\n", err)
			return
		}
		i += 4 + len(spans)*16
		b := testbodies[label-1]
		if !reflect.DeepEqual(spans, b.blockSpans) {
			t.Errorf("Expected coarse spans for label %d:\n%s\nGot spans:\n%s\n", b.label, b.blockSpans, spans)
		}
	}
}

func (b testBody) splitmerge(t *testing.T, uuid dvid.UUID, name dvid.InstanceName) {
	var rles dvid.RLEs
	var y, z, length int32
	length = 15
	startx := int32(rand.Intn(int(b.offset[0] + b.size[0] - length)))
	for z = 0; z < 4; z++ {
		for y = 0; y < 4; y++ {
			pos := dvid.Point3d{startx, b.offset[1] + y, b.offset[2] + z}
			rles = append(rles, dvid.NewRLE(pos, length))
		}
	}
	dvid.Infof("Starting split for label %d at x = %d ...\n", b.label, startx)

	buf := new(bytes.Buffer)
	buf.WriteByte(dvid.EncodingBinary)
	binary.Write(buf, binary.LittleEndian, uint8(3))   // # of dimensions
	binary.Write(buf, binary.LittleEndian, byte(0))    // dimension of run (X = 0)
	buf.WriteByte(byte(0))                             // reserved for later
	binary.Write(buf, binary.LittleEndian, uint32(0))  // Placeholder for # voxels
	binary.Write(buf, binary.LittleEndian, uint32(16)) // Placeholder for # spans
	rleBytes, err := rles.MarshalBinary()
	if err != nil {
		t.Errorf("Unable to serialize RLEs: %v\n", err)
	}
	buf.Write(rleBytes)
	splitBytes := buf.Bytes()

	var newlabel uint64
	reqStr := fmt.Sprintf("%snode/%s/%s/split/%d", server.WebAPIPath, uuid, name, b.label)
	tries := 0
	notDone := true
	for notDone {
		tries++
		dvid.Infof("Trying split %d of label %d ...\n", tries, b.label)
		resp := server.TestHTTPResponse(t, "POST", reqStr, bytes.NewBuffer(splitBytes))
		var retbytes []byte
		if resp.Body != nil {
			retbytes, err = ioutil.ReadAll(resp.Body)
			if err != nil {
				t.Fatalf("could not read response body for split %d of label %d: %v\n", tries, b.label, err)
			}
		}
		switch resp.Code {
		case http.StatusOK:
			jsonVal := make(map[string]uint64)
			if err := json.Unmarshal(retbytes, &jsonVal); err != nil {
				t.Fatalf("Unable to get new label from split.  Instead got: %v\n", jsonVal)
			}
			var ok bool
			newlabel, ok = jsonVal["label"]
			if !ok {
				t.Fatalf("The split request did not yield label value.  Instead got: %v\n", jsonVal)
			}
			notDone = false
		case http.StatusBadRequest:
			dvid.Infof("Bad split response.  Waiting...\n")
			time.Sleep(10 * time.Millisecond)
			buf.Reset()
		default:
			var retstr string
			if retbytes != nil {
				retstr = string(retbytes)
			}
			t.Fatalf("Error in response to split, status code %d: %s\n", resp.Code, retstr)
		}
	}

	// Merge them back.
	testMerge := fmt.Sprintf(`[%d, %d]`, b.label, newlabel)
	reqStr = fmt.Sprintf("%snode/%s/%s/merge", server.WebAPIPath, uuid, name)
	dvid.Infof("Starting merge for label %d -> %d\n", newlabel, b.label)
	tries = 0
	notDone = true
	for notDone {
		tries++
		dvid.Infof("Trying merge %d for label %d -> %d ...\n", tries, newlabel, b.label)
		resp := server.TestHTTPResponse(t, "POST", reqStr, bytes.NewBufferString(testMerge))
		switch resp.Code {
		case http.StatusOK:
			notDone = false
		case http.StatusBadRequest:
			dvid.Infof("Bad merge response.  Waiting...\n")
			time.Sleep(10 * time.Millisecond)
		default:
			var retstr string
			if resp.Body != nil {
				retbytes, err := ioutil.ReadAll(resp.Body)
				if err != nil {
					t.Fatalf("Error trying to read response body from request %q: %v\n", reqStr, err)
					break
				} else {
					retstr = string(retbytes)
				}
			}
			t.Fatalf("Error in response to merge, status code %d: %s\n", resp.Code, retstr)
		}
	}
}

var (
	body1 = testBody{
		label:  1,
		offset: dvid.Point3d{10, 40, 10},
		size:   dvid.Point3d{20, 20, 80},
		blockSpans: []dvid.Span{
			{0, 1, 0, 0},
			{1, 1, 0, 0},
			{2, 1, 0, 0},
		},
		voxelSpans: []dvid.Span{
			{10, 40, 10, 29}, {10, 41, 10, 29}, {10, 42, 10, 29}, {10, 43, 10, 29}, {10, 44, 10, 29},
			{10, 45, 10, 29}, {10, 46, 10, 29}, {10, 47, 10, 29}, {10, 48, 10, 29}, {10, 49, 10, 29},
			{10, 50, 10, 29}, {10, 51, 10, 29}, {10, 52, 10, 29}, {10, 53, 10, 29}, {10, 54, 10, 29},
			{10, 55, 10, 29}, {10, 56, 10, 29}, {10, 57, 10, 29}, {10, 58, 10, 29}, {10, 59, 10, 29},
			{11, 40, 10, 29}, {11, 41, 10, 29}, {11, 42, 10, 29}, {11, 43, 10, 29}, {11, 44, 10, 29},
			{11, 45, 10, 29}, {11, 46, 10, 29}, {11, 47, 10, 29}, {11, 48, 10, 29}, {11, 49, 10, 29},
			{11, 50, 10, 29}, {11, 51, 10, 29}, {11, 52, 10, 29}, {11, 53, 10, 29}, {11, 54, 10, 29},
			{11, 55, 10, 29}, {11, 56, 10, 29}, {11, 57, 10, 29}, {11, 58, 10, 29}, {11, 59, 10, 29},
			{12, 40, 10, 29}, {12, 41, 10, 29}, {12, 42, 10, 29}, {12, 43, 10, 29}, {12, 44, 10, 29},
			{12, 45, 10, 29}, {12, 46, 10, 29}, {12, 47, 10, 29}, {12, 48, 10, 29}, {12, 49, 10, 29},
			{12, 50, 10, 29}, {12, 51, 10, 29}, {12, 52, 10, 29}, {12, 53, 10, 29}, {12, 54, 10, 29},
			{12, 55, 10, 29}, {12, 56, 10, 29}, {12, 57, 10, 29}, {12, 58, 10, 29}, {12, 59, 10, 29},
			{13, 40, 10, 29}, {13, 41, 10, 29}, {13, 42, 10, 29}, {13, 43, 10, 29}, {13, 44, 10, 29},
			{13, 45, 10, 29}, {13, 46, 10, 29}, {13, 47, 10, 29}, {13, 48, 10, 29}, {13, 49, 10, 29},
			{13, 50, 10, 29}, {13, 51, 10, 29}, {13, 52, 10, 29}, {13, 53, 10, 29}, {13, 54, 10, 29},
			{13, 55, 10, 29}, {13, 56, 10, 29}, {13, 57, 10, 29}, {13, 58, 10, 29}, {13, 59, 10, 29},
			{14, 40, 10, 29}, {14, 41, 10, 29}, {14, 42, 10, 29}, {14, 43, 10, 29}, {14, 44, 10, 29},
			{14, 45, 10, 29}, {14, 46, 10, 29}, {14, 47, 10, 29}, {14, 48, 10, 29}, {14, 49, 10, 29},
			{14, 50, 10, 29}, {14, 51, 10, 29}, {14, 52, 10, 29}, {14, 53, 10, 29}, {14, 54, 10, 29},
			{14, 55, 10, 29}, {14, 56, 10, 29}, {14, 57, 10, 29}, {14, 58, 10, 29}, {14, 59, 10, 29},
			{15, 40, 10, 29}, {15, 41, 10, 29}, {15, 42, 10, 29}, {15, 43, 10, 29}, {15, 44, 10, 29},
			{15, 45, 10, 29}, {15, 46, 10, 29}, {15, 47, 10, 29}, {15, 48, 10, 29}, {15, 49, 10, 29},
			{15, 50, 10, 29}, {15, 51, 10, 29}, {15, 52, 10, 29}, {15, 53, 10, 29}, {15, 54, 10, 29},
			{15, 55, 10, 29}, {15, 56, 10, 29}, {15, 57, 10, 29}, {15, 58, 10, 29}, {15, 59, 10, 29},
			{16, 40, 10, 29}, {16, 41, 10, 29}, {16, 42, 10, 29}, {16, 43, 10, 29}, {16, 44, 10, 29},
			{16, 45, 10, 29}, {16, 46, 10, 29}, {16, 47, 10, 29}, {16, 48, 10, 29}, {16, 49, 10, 29},
			{16, 50, 10, 29}, {16, 51, 10, 29}, {16, 52, 10, 29}, {16, 53, 10, 29}, {16, 54, 10, 29},
			{16, 55, 10, 29}, {16, 56, 10, 29}, {16, 57, 10, 29}, {16, 58, 10, 29}, {16, 59, 10, 29},
			{17, 40, 10, 29}, {17, 41, 10, 29}, {17, 42, 10, 29}, {17, 43, 10, 29}, {17, 44, 10, 29},
			{17, 45, 10, 29}, {17, 46, 10, 29}, {17, 47, 10, 29}, {17, 48, 10, 29}, {17, 49, 10, 29},
			{17, 50, 10, 29}, {17, 51, 10, 29}, {17, 52, 10, 29}, {17, 53, 10, 29}, {17, 54, 10, 29},
			{17, 55, 10, 29}, {17, 56, 10, 29}, {17, 57, 10, 29}, {17, 58, 10, 29}, {17, 59, 10, 29},
			{18, 40, 10, 29}, {18, 41, 10, 29}, {18, 42, 10, 29}, {18, 43, 10, 29}, {18, 44, 10, 29},
			{18, 45, 10, 29}, {18, 46, 10, 29}, {18, 47, 10, 29}, {18, 48, 10, 29}, {18, 49, 10, 29},
			{18, 50, 10, 29}, {18, 51, 10, 29}, {18, 52, 10, 29}, {18, 53, 10, 29}, {18, 54, 10, 29},
			{18, 55, 10, 29}, {18, 56, 10, 29}, {18, 57, 10, 29}, {18, 58, 10, 29}, {18, 59, 10, 29},
			{19, 40, 10, 29}, {19, 41, 10, 29}, {19, 42, 10, 29}, {19, 43, 10, 29}, {19, 44, 10, 29},
			{19, 45, 10, 29}, {19, 46, 10, 29}, {19, 47, 10, 29}, {19, 48, 10, 29}, {19, 49, 10, 29},
			{19, 50, 10, 29}, {19, 51, 10, 29}, {19, 52, 10, 29}, {19, 53, 10, 29}, {19, 54, 10, 29},
			{19, 55, 10, 29}, {19, 56, 10, 29}, {19, 57, 10, 29}, {19, 58, 10, 29}, {19, 59, 10, 29},
			{20, 40, 10, 29}, {20, 41, 10, 29}, {20, 42, 10, 29}, {20, 43, 10, 29}, {20, 44, 10, 29},
			{20, 45, 10, 29}, {20, 46, 10, 29}, {20, 47, 10, 29}, {20, 48, 10, 29}, {20, 49, 10, 29},
			{20, 50, 10, 29}, {20, 51, 10, 29}, {20, 52, 10, 29}, {20, 53, 10, 29}, {20, 54, 10, 29},
			{20, 55, 10, 29}, {20, 56, 10, 29}, {20, 57, 10, 29}, {20, 58, 10, 29}, {20, 59, 10, 29},
			{21, 40, 10, 29}, {21, 41, 10, 29}, {21, 42, 10, 29}, {21, 43, 10, 29}, {21, 44, 10, 29},
			{21, 45, 10, 29}, {21, 46, 10, 29}, {21, 47, 10, 29}, {21, 48, 10, 29}, {21, 49, 10, 29},
			{21, 50, 10, 29}, {21, 51, 10, 29}, {21, 52, 10, 29}, {21, 53, 10, 29}, {21, 54, 10, 29},
			{21, 55, 10, 29}, {21, 56, 10, 29}, {21, 57, 10, 29}, {21, 58, 10, 29}, {21, 59, 10, 29},
			{22, 40, 10, 29}, {22, 41, 10, 29}, {22, 42, 10, 29}, {22, 43, 10, 29}, {22, 44, 10, 29},
			{22, 45, 10, 29}, {22, 46, 10, 29}, {22, 47, 10, 29}, {22, 48, 10, 29}, {22, 49, 10, 29},
			{22, 50, 10, 29}, {22, 51, 10, 29}, {22, 52, 10, 29}, {22, 53, 10, 29}, {22, 54, 10, 29},
			{22, 55, 10, 29}, {22, 56, 10, 29}, {22, 57, 10, 29}, {22, 58, 10, 29}, {22, 59, 10, 29},
			{23, 40, 10, 29}, {23, 41, 10, 29}, {23, 42, 10, 29}, {23, 43, 10, 29}, {23, 44, 10, 29},
			{23, 45, 10, 29}, {23, 46, 10, 29}, {23, 47, 10, 29}, {23, 48, 10, 29}, {23, 49, 10, 29},
			{23, 50, 10, 29}, {23, 51, 10, 29}, {23, 52, 10, 29}, {23, 53, 10, 29}, {23, 54, 10, 29},
			{23, 55, 10, 29}, {23, 56, 10, 29}, {23, 57, 10, 29}, {23, 58, 10, 29}, {23, 59, 10, 29},
			{24, 40, 10, 29}, {24, 41, 10, 29}, {24, 42, 10, 29}, {24, 43, 10, 29}, {24, 44, 10, 29},
			{24, 45, 10, 29}, {24, 46, 10, 29}, {24, 47, 10, 29}, {24, 48, 10, 29}, {24, 49, 10, 29},
			{24, 50, 10, 29}, {24, 51, 10, 29}, {24, 52, 10, 29}, {24, 53, 10, 29}, {24, 54, 10, 29},
			{24, 55, 10, 29}, {24, 56, 10, 29}, {24, 57, 10, 29}, {24, 58, 10, 29}, {24, 59, 10, 29},
			{25, 40, 10, 29}, {25, 41, 10, 29}, {25, 42, 10, 29}, {25, 43, 10, 29}, {25, 44, 10, 29},
			{25, 45, 10, 29}, {25, 46, 10, 29}, {25, 47, 10, 29}, {25, 48, 10, 29}, {25, 49, 10, 29},
			{25, 50, 10, 29}, {25, 51, 10, 29}, {25, 52, 10, 29}, {25, 53, 10, 29}, {25, 54, 10, 29},
			{25, 55, 10, 29}, {25, 56, 10, 29}, {25, 57, 10, 29}, {25, 58, 10, 29}, {25, 59, 10, 29},
			{26, 40, 10, 29}, {26, 41, 10, 29}, {26, 42, 10, 29}, {26, 43, 10, 29}, {26, 44, 10, 29},
			{26, 45, 10, 29}, {26, 46, 10, 29}, {26, 47, 10, 29}, {26, 48, 10, 29}, {26, 49, 10, 29},
			{26, 50, 10, 29}, {26, 51, 10, 29}, {26, 52, 10, 29}, {26, 53, 10, 29}, {26, 54, 10, 29},
			{26, 55, 10, 29}, {26, 56, 10, 29}, {26, 57, 10, 29}, {26, 58, 10, 29}, {26, 59, 10, 29},
			{27, 40, 10, 29}, {27, 41, 10, 29}, {27, 42, 10, 29}, {27, 43, 10, 29}, {27, 44, 10, 29},
			{27, 45, 10, 29}, {27, 46, 10, 29}, {27, 47, 10, 29}, {27, 48, 10, 29}, {27, 49, 10, 29},
			{27, 50, 10, 29}, {27, 51, 10, 29}, {27, 52, 10, 29}, {27, 53, 10, 29}, {27, 54, 10, 29},
			{27, 55, 10, 29}, {27, 56, 10, 29}, {27, 57, 10, 29}, {27, 58, 10, 29}, {27, 59, 10, 29},
			{28, 40, 10, 29}, {28, 41, 10, 29}, {28, 42, 10, 29}, {28, 43, 10, 29}, {28, 44, 10, 29},
			{28, 45, 10, 29}, {28, 46, 10, 29}, {28, 47, 10, 29}, {28, 48, 10, 29}, {28, 49, 10, 29},
			{28, 50, 10, 29}, {28, 51, 10, 29}, {28, 52, 10, 29}, {28, 53, 10, 29}, {28, 54, 10, 29},
			{28, 55, 10, 29}, {28, 56, 10, 29}, {28, 57, 10, 29}, {28, 58, 10, 29}, {28, 59, 10, 29},
			{29, 40, 10, 29}, {29, 41, 10, 29}, {29, 42, 10, 29}, {29, 43, 10, 29}, {29, 44, 10, 29},
			{29, 45, 10, 29}, {29, 46, 10, 29}, {29, 47, 10, 29}, {29, 48, 10, 29}, {29, 49, 10, 29},
			{29, 50, 10, 29}, {29, 51, 10, 29}, {29, 52, 10, 29}, {29, 53, 10, 29}, {29, 54, 10, 29},
			{29, 55, 10, 29}, {29, 56, 10, 29}, {29, 57, 10, 29}, {29, 58, 10, 29}, {29, 59, 10, 29},
			{30, 40, 10, 29}, {30, 41, 10, 29}, {30, 42, 10, 29}, {30, 43, 10, 29}, {30, 44, 10, 29},
			{30, 45, 10, 29}, {30, 46, 10, 29}, {30, 47, 10, 29}, {30, 48, 10, 29}, {30, 49, 10, 29},
			{30, 50, 10, 29}, {30, 51, 10, 29}, {30, 52, 10, 29}, {30, 53, 10, 29}, {30, 54, 10, 29},
			{30, 55, 10, 29}, {30, 56, 10, 29}, {30, 57, 10, 29}, {30, 58, 10, 29}, {30, 59, 10, 29},
			{31, 40, 10, 29}, {31, 41, 10, 29}, {31, 42, 10, 29}, {31, 43, 10, 29}, {31, 44, 10, 29},
			{31, 45, 10, 29}, {31, 46, 10, 29}, {31, 47, 10, 29}, {31, 48, 10, 29}, {31, 49, 10, 29},
			{31, 50, 10, 29}, {31, 51, 10, 29}, {31, 52, 10, 29}, {31, 53, 10, 29}, {31, 54, 10, 29},
			{31, 55, 10, 29}, {31, 56, 10, 29}, {31, 57, 10, 29}, {31, 58, 10, 29}, {31, 59, 10, 29},
			{32, 40, 10, 29}, {32, 41, 10, 29}, {32, 42, 10, 29}, {32, 43, 10, 29}, {32, 44, 10, 29},
			{32, 45, 10, 29}, {32, 46, 10, 29}, {32, 47, 10, 29}, {32, 48, 10, 29}, {32, 49, 10, 29},
			{32, 50, 10, 29}, {32, 51, 10, 29}, {32, 52, 10, 29}, {32, 53, 10, 29}, {32, 54, 10, 29},
			{32, 55, 10, 29}, {32, 56, 10, 29}, {32, 57, 10, 29}, {32, 58, 10, 29}, {32, 59, 10, 29},
			{33, 40, 10, 29}, {33, 41, 10, 29}, {33, 42, 10, 29}, {33, 43, 10, 29}, {33, 44, 10, 29},
			{33, 45, 10, 29}, {33, 46, 10, 29}, {33, 47, 10, 29}, {33, 48, 10, 29}, {33, 49, 10, 29},
			{33, 50, 10, 29}, {33, 51, 10, 29}, {33, 52, 10, 29}, {33, 53, 10, 29}, {33, 54, 10, 29},
			{33, 55, 10, 29}, {33, 56, 10, 29}, {33, 57, 10, 29}, {33, 58, 10, 29}, {33, 59, 10, 29},
			{34, 40, 10, 29}, {34, 41, 10, 29}, {34, 42, 10, 29}, {34, 43, 10, 29}, {34, 44, 10, 29},
			{34, 45, 10, 29}, {34, 46, 10, 29}, {34, 47, 10, 29}, {34, 48, 10, 29}, {34, 49, 10, 29},
			{34, 50, 10, 29}, {34, 51, 10, 29}, {34, 52, 10, 29}, {34, 53, 10, 29}, {34, 54, 10, 29},
			{34, 55, 10, 29}, {34, 56, 10, 29}, {34, 57, 10, 29}, {34, 58, 10, 29}, {34, 59, 10, 29},
			{35, 40, 10, 29}, {35, 41, 10, 29}, {35, 42, 10, 29}, {35, 43, 10, 29}, {35, 44, 10, 29},
			{35, 45, 10, 29}, {35, 46, 10, 29}, {35, 47, 10, 29}, {35, 48, 10, 29}, {35, 49, 10, 29},
			{35, 50, 10, 29}, {35, 51, 10, 29}, {35, 52, 10, 29}, {35, 53, 10, 29}, {35, 54, 10, 29},
			{35, 55, 10, 29}, {35, 56, 10, 29}, {35, 57, 10, 29}, {35, 58, 10, 29}, {35, 59, 10, 29},
			{36, 40, 10, 29}, {36, 41, 10, 29}, {36, 42, 10, 29}, {36, 43, 10, 29}, {36, 44, 10, 29},
			{36, 45, 10, 29}, {36, 46, 10, 29}, {36, 47, 10, 29}, {36, 48, 10, 29}, {36, 49, 10, 29},
			{36, 50, 10, 29}, {36, 51, 10, 29}, {36, 52, 10, 29}, {36, 53, 10, 29}, {36, 54, 10, 29},
			{36, 55, 10, 29}, {36, 56, 10, 29}, {36, 57, 10, 29}, {36, 58, 10, 29}, {36, 59, 10, 29},
			{37, 40, 10, 29}, {37, 41, 10, 29}, {37, 42, 10, 29}, {37, 43, 10, 29}, {37, 44, 10, 29},
			{37, 45, 10, 29}, {37, 46, 10, 29}, {37, 47, 10, 29}, {37, 48, 10, 29}, {37, 49, 10, 29},
			{37, 50, 10, 29}, {37, 51, 10, 29}, {37, 52, 10, 29}, {37, 53, 10, 29}, {37, 54, 10, 29},
			{37, 55, 10, 29}, {37, 56, 10, 29}, {37, 57, 10, 29}, {37, 58, 10, 29}, {37, 59, 10, 29},
			{38, 40, 10, 29}, {38, 41, 10, 29}, {38, 42, 10, 29}, {38, 43, 10, 29}, {38, 44, 10, 29},
			{38, 45, 10, 29}, {38, 46, 10, 29}, {38, 47, 10, 29}, {38, 48, 10, 29}, {38, 49, 10, 29},
			{38, 50, 10, 29}, {38, 51, 10, 29}, {38, 52, 10, 29}, {38, 53, 10, 29}, {38, 54, 10, 29},
			{38, 55, 10, 29}, {38, 56, 10, 29}, {38, 57, 10, 29}, {38, 58, 10, 29}, {38, 59, 10, 29},
			{39, 40, 10, 29}, {39, 41, 10, 29}, {39, 42, 10, 29}, {39, 43, 10, 29}, {39, 44, 10, 29},
			{39, 45, 10, 29}, {39, 46, 10, 29}, {39, 47, 10, 29}, {39, 48, 10, 29}, {39, 49, 10, 29},
			{39, 50, 10, 29}, {39, 51, 10, 29}, {39, 52, 10, 29}, {39, 53, 10, 29}, {39, 54, 10, 29},
			{39, 55, 10, 29}, {39, 56, 10, 29}, {39, 57, 10, 29}, {39, 58, 10, 29}, {39, 59, 10, 29},
			{40, 40, 10, 29}, {40, 41, 10, 29}, {40, 42, 10, 29}, {40, 43, 10, 29}, {40, 44, 10, 29},
			{40, 45, 10, 29}, {40, 46, 10, 29}, {40, 47, 10, 29}, {40, 48, 10, 29}, {40, 49, 10, 29},
			{40, 50, 10, 29}, {40, 51, 10, 29}, {40, 52, 10, 29}, {40, 53, 10, 29}, {40, 54, 10, 29},
			{40, 55, 10, 29}, {40, 56, 10, 29}, {40, 57, 10, 29}, {40, 58, 10, 29}, {40, 59, 10, 29},
			{41, 40, 10, 29}, {41, 41, 10, 29}, {41, 42, 10, 29}, {41, 43, 10, 29}, {41, 44, 10, 29},
			{41, 45, 10, 29}, {41, 46, 10, 29}, {41, 47, 10, 29}, {41, 48, 10, 29}, {41, 49, 10, 29},
			{41, 50, 10, 29}, {41, 51, 10, 29}, {41, 52, 10, 29}, {41, 53, 10, 29}, {41, 54, 10, 29},
			{41, 55, 10, 29}, {41, 56, 10, 29}, {41, 57, 10, 29}, {41, 58, 10, 29}, {41, 59, 10, 29},
			{42, 40, 10, 29}, {42, 41, 10, 29}, {42, 42, 10, 29}, {42, 43, 10, 29}, {42, 44, 10, 29},
			{42, 45, 10, 29}, {42, 46, 10, 29}, {42, 47, 10, 29}, {42, 48, 10, 29}, {42, 49, 10, 29},
			{42, 50, 10, 29}, {42, 51, 10, 29}, {42, 52, 10, 29}, {42, 53, 10, 29}, {42, 54, 10, 29},
			{42, 55, 10, 29}, {42, 56, 10, 29}, {42, 57, 10, 29}, {42, 58, 10, 29}, {42, 59, 10, 29},
			{43, 40, 10, 29}, {43, 41, 10, 29}, {43, 42, 10, 29}, {43, 43, 10, 29}, {43, 44, 10, 29},
			{43, 45, 10, 29}, {43, 46, 10, 29}, {43, 47, 10, 29}, {43, 48, 10, 29}, {43, 49, 10, 29},
			{43, 50, 10, 29}, {43, 51, 10, 29}, {43, 52, 10, 29}, {43, 53, 10, 29}, {43, 54, 10, 29},
			{43, 55, 10, 29}, {43, 56, 10, 29}, {43, 57, 10, 29}, {43, 58, 10, 29}, {43, 59, 10, 29},
			{44, 40, 10, 29}, {44, 41, 10, 29}, {44, 42, 10, 29}, {44, 43, 10, 29}, {44, 44, 10, 29},
			{44, 45, 10, 29}, {44, 46, 10, 29}, {44, 47, 10, 29}, {44, 48, 10, 29}, {44, 49, 10, 29},
			{44, 50, 10, 29}, {44, 51, 10, 29}, {44, 52, 10, 29}, {44, 53, 10, 29}, {44, 54, 10, 29},
			{44, 55, 10, 29}, {44, 56, 10, 29}, {44, 57, 10, 29}, {44, 58, 10, 29}, {44, 59, 10, 29},
			{45, 40, 10, 29}, {45, 41, 10, 29}, {45, 42, 10, 29}, {45, 43, 10, 29}, {45, 44, 10, 29},
			{45, 45, 10, 29}, {45, 46, 10, 29}, {45, 47, 10, 29}, {45, 48, 10, 29}, {45, 49, 10, 29},
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			{86, 55, 10, 29}, {86, 56, 10, 29}, {86, 57, 10, 29}, {86, 58, 10, 29}, {86, 59, 10, 29},
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			{87, 50, 10, 29}, {87, 51, 10, 29}, {87, 52, 10, 29}, {87, 53, 10, 29}, {87, 54, 10, 29},
			{87, 55, 10, 29}, {87, 56, 10, 29}, {87, 57, 10, 29}, {87, 58, 10, 29}, {87, 59, 10, 29},
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			{88, 50, 10, 29}, {88, 51, 10, 29}, {88, 52, 10, 29}, {88, 53, 10, 29}, {88, 54, 10, 29},
			{88, 55, 10, 29}, {88, 56, 10, 29}, {88, 57, 10, 29}, {88, 58, 10, 29}, {88, 59, 10, 29},
			{89, 40, 10, 29}, {89, 41, 10, 29}, {89, 42, 10, 29}, {89, 43, 10, 29}, {89, 44, 10, 29},
			{89, 45, 10, 29}, {89, 46, 10, 29}, {89, 47, 10, 29}, {89, 48, 10, 29}, {89, 49, 10, 29},
			{89, 50, 10, 29}, {89, 51, 10, 29}, {89, 52, 10, 29}, {89, 53, 10, 29}, {89, 54, 10, 29},
			{89, 55, 10, 29}, {89, 56, 10, 29}, {89, 57, 10, 29}, {89, 58, 10, 29}, {89, 59, 10, 29},
		},
	}
	body2 = testBody{
		label:  2,
		offset: dvid.Point3d{30, 20, 40},
		size:   dvid.Point3d{50, 50, 20},
		blockSpans: []dvid.Span{
			{1, 0, 0, 2},
			{1, 1, 0, 2},
			{1, 2, 0, 2},
		},
		voxelSpans: []dvid.Span{
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			{45, 64, 32, 63}, {45, 65, 32, 63}, {45, 66, 32, 63}, {45, 67, 32, 63}, {45, 68, 32, 63},
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			{48, 66, 64, 79}, {48, 67, 64, 79}, {48, 68, 64, 79}, {48, 69, 64, 79}, {49, 64, 64, 79},
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			{50, 69, 64, 79}, {51, 64, 64, 79}, {51, 65, 64, 79}, {51, 66, 64, 79}, {51, 67, 64, 79},
			{51, 68, 64, 79}, {51, 69, 64, 79}, {52, 64, 64, 79}, {52, 65, 64, 79}, {52, 66, 64, 79},
			{52, 67, 64, 79}, {52, 68, 64, 79}, {52, 69, 64, 79}, {53, 64, 64, 79}, {53, 65, 64, 79},
			{53, 66, 64, 79}, {53, 67, 64, 79}, {53, 68, 64, 79}, {53, 69, 64, 79}, {54, 64, 64, 79},
			{54, 65, 64, 79}, {54, 66, 64, 79}, {54, 67, 64, 79}, {54, 68, 64, 79}, {54, 69, 64, 79},
			{55, 64, 64, 79}, {55, 65, 64, 79}, {55, 66, 64, 79}, {55, 67, 64, 79}, {55, 68, 64, 79},
			{55, 69, 64, 79}, {56, 64, 64, 79}, {56, 65, 64, 79}, {56, 66, 64, 79}, {56, 67, 64, 79},
			{56, 68, 64, 79}, {56, 69, 64, 79}, {57, 64, 64, 79}, {57, 65, 64, 79}, {57, 66, 64, 79},
			{57, 67, 64, 79}, {57, 68, 64, 79}, {57, 69, 64, 79}, {58, 64, 64, 79}, {58, 65, 64, 79},
			{58, 66, 64, 79}, {58, 67, 64, 79}, {58, 68, 64, 79}, {58, 69, 64, 79}, {59, 64, 64, 79},
			{59, 65, 64, 79}, {59, 66, 64, 79}, {59, 67, 64, 79}, {59, 68, 64, 79}, {59, 69, 64, 79},
		},
	}
	body3 = testBody{
		label:  3,
		offset: dvid.Point3d{40, 40, 10},
		size:   dvid.Point3d{20, 20, 30},
		blockSpans: []dvid.Span{
			{0, 1, 1, 1},
			{1, 1, 1, 1},
		},
		voxelSpans: []dvid.Span{
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			{10, 55, 40, 59}, {10, 56, 40, 59}, {10, 57, 40, 59}, {10, 58, 40, 59}, {10, 59, 40, 59},
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			{39, 55, 40, 59}, {39, 56, 40, 59}, {39, 57, 40, 59}, {39, 58, 40, 59}, {39, 59, 40, 59},
		},
	}
	body4 = testBody{
		label:  4,
		offset: dvid.Point3d{75, 40, 60},
		size:   dvid.Point3d{20, 20, 30},
		blockSpans: []dvid.Span{
			{1, 1, 2, 2},
			{2, 1, 2, 2},
		},
		voxelSpans: []dvid.Span{
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			{80, 45, 75, 94}, {80, 46, 75, 94}, {80, 47, 75, 94}, {80, 48, 75, 94}, {80, 49, 75, 94},
			{80, 50, 75, 94}, {80, 51, 75, 94}, {80, 52, 75, 94}, {80, 53, 75, 94}, {80, 54, 75, 94},
			{80, 55, 75, 94}, {80, 56, 75, 94}, {80, 57, 75, 94}, {80, 58, 75, 94}, {80, 59, 75, 94},
			{81, 40, 75, 94}, {81, 41, 75, 94}, {81, 42, 75, 94}, {81, 43, 75, 94}, {81, 44, 75, 94},
			{81, 45, 75, 94}, {81, 46, 75, 94}, {81, 47, 75, 94}, {81, 48, 75, 94}, {81, 49, 75, 94},
			{81, 50, 75, 94}, {81, 51, 75, 94}, {81, 52, 75, 94}, {81, 53, 75, 94}, {81, 54, 75, 94},
			{81, 55, 75, 94}, {81, 56, 75, 94}, {81, 57, 75, 94}, {81, 58, 75, 94}, {81, 59, 75, 94},
			{82, 40, 75, 94}, {82, 41, 75, 94}, {82, 42, 75, 94}, {82, 43, 75, 94}, {82, 44, 75, 94},
			{82, 45, 75, 94}, {82, 46, 75, 94}, {82, 47, 75, 94}, {82, 48, 75, 94}, {82, 49, 75, 94},
			{82, 50, 75, 94}, {82, 51, 75, 94}, {82, 52, 75, 94}, {82, 53, 75, 94}, {82, 54, 75, 94},
			{82, 55, 75, 94}, {82, 56, 75, 94}, {82, 57, 75, 94}, {82, 58, 75, 94}, {82, 59, 75, 94},
			{83, 40, 75, 94}, {83, 41, 75, 94}, {83, 42, 75, 94}, {83, 43, 75, 94}, {83, 44, 75, 94},
			{83, 45, 75, 94}, {83, 46, 75, 94}, {83, 47, 75, 94}, {83, 48, 75, 94}, {83, 49, 75, 94},
			{83, 50, 75, 94}, {83, 51, 75, 94}, {83, 52, 75, 94}, {83, 53, 75, 94}, {83, 54, 75, 94},
			{83, 55, 75, 94}, {83, 56, 75, 94}, {83, 57, 75, 94}, {83, 58, 75, 94}, {83, 59, 75, 94},
			{84, 40, 75, 94}, {84, 41, 75, 94}, {84, 42, 75, 94}, {84, 43, 75, 94}, {84, 44, 75, 94},
			{84, 45, 75, 94}, {84, 46, 75, 94}, {84, 47, 75, 94}, {84, 48, 75, 94}, {84, 49, 75, 94},
			{84, 50, 75, 94}, {84, 51, 75, 94}, {84, 52, 75, 94}, {84, 53, 75, 94}, {84, 54, 75, 94},
			{84, 55, 75, 94}, {84, 56, 75, 94}, {84, 57, 75, 94}, {84, 58, 75, 94}, {84, 59, 75, 94},
			{85, 40, 75, 94}, {85, 41, 75, 94}, {85, 42, 75, 94}, {85, 43, 75, 94}, {85, 44, 75, 94},
			{85, 45, 75, 94}, {85, 46, 75, 94}, {85, 47, 75, 94}, {85, 48, 75, 94}, {85, 49, 75, 94},
			{85, 50, 75, 94}, {85, 51, 75, 94}, {85, 52, 75, 94}, {85, 53, 75, 94}, {85, 54, 75, 94},
			{85, 55, 75, 94}, {85, 56, 75, 94}, {85, 57, 75, 94}, {85, 58, 75, 94}, {85, 59, 75, 94},
			{86, 40, 75, 94}, {86, 41, 75, 94}, {86, 42, 75, 94}, {86, 43, 75, 94}, {86, 44, 75, 94},
			{86, 45, 75, 94}, {86, 46, 75, 94}, {86, 47, 75, 94}, {86, 48, 75, 94}, {86, 49, 75, 94},
			{86, 50, 75, 94}, {86, 51, 75, 94}, {86, 52, 75, 94}, {86, 53, 75, 94}, {86, 54, 75, 94},
			{86, 55, 75, 94}, {86, 56, 75, 94}, {86, 57, 75, 94}, {86, 58, 75, 94}, {86, 59, 75, 94},
			{87, 40, 75, 94}, {87, 41, 75, 94}, {87, 42, 75, 94}, {87, 43, 75, 94}, {87, 44, 75, 94},
			{87, 45, 75, 94}, {87, 46, 75, 94}, {87, 47, 75, 94}, {87, 48, 75, 94}, {87, 49, 75, 94},
			{87, 50, 75, 94}, {87, 51, 75, 94}, {87, 52, 75, 94}, {87, 53, 75, 94}, {87, 54, 75, 94},
			{87, 55, 75, 94}, {87, 56, 75, 94}, {87, 57, 75, 94}, {87, 58, 75, 94}, {87, 59, 75, 94},
			{88, 40, 75, 94}, {88, 41, 75, 94}, {88, 42, 75, 94}, {88, 43, 75, 94}, {88, 44, 75, 94},
			{88, 45, 75, 94}, {88, 46, 75, 94}, {88, 47, 75, 94}, {88, 48, 75, 94}, {88, 49, 75, 94},
			{88, 50, 75, 94}, {88, 51, 75, 94}, {88, 52, 75, 94}, {88, 53, 75, 94}, {88, 54, 75, 94},
			{88, 55, 75, 94}, {88, 56, 75, 94}, {88, 57, 75, 94}, {88, 58, 75, 94}, {88, 59, 75, 94},
			{89, 40, 75, 94}, {89, 41, 75, 94}, {89, 42, 75, 94}, {89, 43, 75, 94}, {89, 44, 75, 94},
			{89, 45, 75, 94}, {89, 46, 75, 94}, {89, 47, 75, 94}, {89, 48, 75, 94}, {89, 49, 75, 94},
			{89, 50, 75, 94}, {89, 51, 75, 94}, {89, 52, 75, 94}, {89, 53, 75, 94}, {89, 54, 75, 94},
			{89, 55, 75, 94}, {89, 56, 75, 94}, {89, 57, 75, 94}, {89, 58, 75, 94}, {89, 59, 75, 94},
		},
	}
	bodyleft = testBody{
		label:  4,
		offset: dvid.Point3d{75, 40, 60},
		size:   dvid.Point3d{20, 20, 21},
		blockSpans: []dvid.Span{
			{1, 1, 2, 2},
			{2, 1, 2, 2},
		},
		voxelSpans: []dvid.Span{
			{60, 40, 75, 94}, {60, 41, 75, 94}, {60, 42, 75, 94}, {60, 43, 75, 94}, {60, 44, 75, 94},
			{60, 45, 75, 94}, {60, 46, 75, 94}, {60, 47, 75, 94}, {60, 48, 75, 94}, {60, 49, 75, 94},
			{60, 50, 75, 94}, {60, 51, 75, 94}, {60, 52, 75, 94}, {60, 53, 75, 94}, {60, 54, 75, 94},
			{60, 55, 75, 94}, {60, 56, 75, 94}, {60, 57, 75, 94}, {60, 58, 75, 94}, {60, 59, 75, 94},
			{61, 40, 75, 94}, {61, 41, 75, 94}, {61, 42, 75, 94}, {61, 43, 75, 94}, {61, 44, 75, 94},
			{61, 45, 75, 94}, {61, 46, 75, 94}, {61, 47, 75, 94}, {61, 48, 75, 94}, {61, 49, 75, 94},
			{61, 50, 75, 94}, {61, 51, 75, 94}, {61, 52, 75, 94}, {61, 53, 75, 94}, {61, 54, 75, 94},
			{61, 55, 75, 94}, {61, 56, 75, 94}, {61, 57, 75, 94}, {61, 58, 75, 94}, {61, 59, 75, 94},
			{62, 40, 75, 94}, {62, 41, 75, 94}, {62, 42, 75, 94}, {62, 43, 75, 94}, {62, 44, 75, 94},
			{62, 45, 75, 94}, {62, 46, 75, 94}, {62, 47, 75, 94}, {62, 48, 75, 94}, {62, 49, 75, 94},
			{62, 50, 75, 94}, {62, 51, 75, 94}, {62, 52, 75, 94}, {62, 53, 75, 94}, {62, 54, 75, 94},
			{62, 55, 75, 94}, {62, 56, 75, 94}, {62, 57, 75, 94}, {62, 58, 75, 94}, {62, 59, 75, 94},
			{63, 40, 75, 94}, {63, 41, 75, 94}, {63, 42, 75, 94}, {63, 43, 75, 94}, {63, 44, 75, 94},
			{63, 45, 75, 94}, {63, 46, 75, 94}, {63, 47, 75, 94}, {63, 48, 75, 94}, {63, 49, 75, 94},
			{63, 50, 75, 94}, {63, 51, 75, 94}, {63, 52, 75, 94}, {63, 53, 75, 94}, {63, 54, 75, 94},
			{63, 55, 75, 94}, {63, 56, 75, 94}, {63, 57, 75, 94}, {63, 58, 75, 94}, {63, 59, 75, 94},
			{64, 40, 75, 94}, {64, 41, 75, 94}, {64, 42, 75, 94}, {64, 43, 75, 94}, {64, 44, 75, 94},
			{64, 45, 75, 94}, {64, 46, 75, 94}, {64, 47, 75, 94}, {64, 48, 75, 94}, {64, 49, 75, 94},
			{64, 50, 75, 94}, {64, 51, 75, 94}, {64, 52, 75, 94}, {64, 53, 75, 94}, {64, 54, 75, 94},
			{64, 55, 75, 94}, {64, 56, 75, 94}, {64, 57, 75, 94}, {64, 58, 75, 94}, {64, 59, 75, 94},
			{65, 40, 75, 94}, {65, 41, 75, 94}, {65, 42, 75, 94}, {65, 43, 75, 94}, {65, 44, 75, 94},
			{65, 45, 75, 94}, {65, 46, 75, 94}, {65, 47, 75, 94}, {65, 48, 75, 94}, {65, 49, 75, 94},
			{65, 50, 75, 94}, {65, 51, 75, 94}, {65, 52, 75, 94}, {65, 53, 75, 94}, {65, 54, 75, 94},
			{65, 55, 75, 94}, {65, 56, 75, 94}, {65, 57, 75, 94}, {65, 58, 75, 94}, {65, 59, 75, 94},
			{66, 40, 75, 94}, {66, 41, 75, 94}, {66, 42, 75, 94}, {66, 43, 75, 94}, {66, 44, 75, 94},
			{66, 45, 75, 94}, {66, 46, 75, 94}, {66, 47, 75, 94}, {66, 48, 75, 94}, {66, 49, 75, 94},
			{66, 50, 75, 94}, {66, 51, 75, 94}, {66, 52, 75, 94}, {66, 53, 75, 94}, {66, 54, 75, 94},
			{66, 55, 75, 94}, {66, 56, 75, 94}, {66, 57, 75, 94}, {66, 58, 75, 94}, {66, 59, 75, 94},
			{67, 40, 75, 94}, {67, 41, 75, 94}, {67, 42, 75, 94}, {67, 43, 75, 94}, {67, 44, 75, 94},
			{67, 45, 75, 94}, {67, 46, 75, 94}, {67, 47, 75, 94}, {67, 48, 75, 94}, {67, 49, 75, 94},
			{67, 50, 75, 94}, {67, 51, 75, 94}, {67, 52, 75, 94}, {67, 53, 75, 94}, {67, 54, 75, 94},
			{67, 55, 75, 94}, {67, 56, 75, 94}, {67, 57, 75, 94}, {67, 58, 75, 94}, {67, 59, 75, 94},
			{68, 40, 75, 94}, {68, 41, 75, 94}, {68, 42, 75, 94}, {68, 43, 75, 94}, {68, 44, 75, 94},
			{68, 45, 75, 94}, {68, 46, 75, 94}, {68, 47, 75, 94}, {68, 48, 75, 94}, {68, 49, 75, 94},
			{68, 50, 75, 94}, {68, 51, 75, 94}, {68, 52, 75, 94}, {68, 53, 75, 94}, {68, 54, 75, 94},
			{68, 55, 75, 94}, {68, 56, 75, 94}, {68, 57, 75, 94}, {68, 58, 75, 94}, {68, 59, 75, 94},
			{69, 40, 75, 94}, {69, 41, 75, 94}, {69, 42, 75, 94}, {69, 43, 75, 94}, {69, 44, 75, 94},
			{69, 45, 75, 94}, {69, 46, 75, 94}, {69, 47, 75, 94}, {69, 48, 75, 94}, {69, 49, 75, 94},
			{69, 50, 75, 94}, {69, 51, 75, 94}, {69, 52, 75, 94}, {69, 53, 75, 94}, {69, 54, 75, 94},
			{69, 55, 75, 94}, {69, 56, 75, 94}, {69, 57, 75, 94}, {69, 58, 75, 94}, {69, 59, 75, 94},
			{70, 40, 75, 94}, {70, 41, 75, 94}, {70, 42, 75, 94}, {70, 43, 75, 94}, {70, 44, 75, 94},
			{70, 45, 75, 94}, {70, 46, 75, 94}, {70, 47, 75, 94}, {70, 48, 75, 94}, {70, 49, 75, 94},
			{70, 50, 75, 94}, {70, 51, 75, 94}, {70, 52, 75, 94}, {70, 53, 75, 94}, {70, 54, 75, 94},
			{70, 55, 75, 94}, {70, 56, 75, 94}, {70, 57, 75, 94}, {70, 58, 75, 94}, {70, 59, 75, 94},
			{71, 40, 75, 94}, {71, 41, 75, 94}, {71, 42, 75, 94}, {71, 43, 75, 94}, {71, 44, 75, 94},
			{71, 45, 75, 94}, {71, 46, 75, 94}, {71, 47, 75, 94}, {71, 48, 75, 94}, {71, 49, 75, 94},
			{71, 50, 75, 94}, {71, 51, 75, 94}, {71, 52, 75, 94}, {71, 53, 75, 94}, {71, 54, 75, 94},
			{71, 55, 75, 94}, {71, 56, 75, 94}, {71, 57, 75, 94}, {71, 58, 75, 94}, {71, 59, 75, 94},
			{72, 40, 75, 94}, {72, 41, 75, 94}, {72, 42, 75, 94}, {72, 43, 75, 94}, {72, 44, 75, 94},
			{72, 45, 75, 94}, {72, 46, 75, 94}, {72, 47, 75, 94}, {72, 48, 75, 94}, {72, 49, 75, 94},
			{72, 50, 75, 94}, {72, 51, 75, 94}, {72, 52, 75, 94}, {72, 53, 75, 94}, {72, 54, 75, 94},
			{72, 55, 75, 94}, {72, 56, 75, 94}, {72, 57, 75, 94}, {72, 58, 75, 94}, {72, 59, 75, 94},
			{73, 40, 75, 94}, {73, 41, 75, 94}, {73, 42, 75, 94}, {73, 43, 75, 94}, {73, 44, 75, 94},
			{73, 45, 75, 94}, {73, 46, 75, 94}, {73, 47, 75, 94}, {73, 48, 75, 94}, {73, 49, 75, 94},
			{73, 50, 75, 94}, {73, 51, 75, 94}, {73, 52, 75, 94}, {73, 53, 75, 94}, {73, 54, 75, 94},
			{73, 55, 75, 94}, {73, 56, 75, 94}, {73, 57, 75, 94}, {73, 58, 75, 94}, {73, 59, 75, 94},
			{74, 40, 75, 94}, {74, 41, 75, 94}, {74, 42, 75, 94}, {74, 43, 75, 94}, {74, 44, 75, 94},
			{74, 45, 75, 94}, {74, 46, 75, 94}, {74, 47, 75, 94}, {74, 48, 75, 94}, {74, 49, 75, 94},
			{74, 50, 75, 94}, {74, 51, 75, 94}, {74, 52, 75, 94}, {74, 53, 75, 94}, {74, 54, 75, 94},
			{74, 55, 75, 94}, {74, 56, 75, 94}, {74, 57, 75, 94}, {74, 58, 75, 94}, {74, 59, 75, 94},
			{75, 40, 75, 94}, {75, 41, 75, 94}, {75, 42, 75, 94}, {75, 43, 75, 94}, {75, 44, 75, 94},
			{75, 45, 75, 94}, {75, 46, 75, 94}, {75, 47, 75, 94}, {75, 48, 75, 94}, {75, 49, 75, 94},
			{75, 50, 75, 94}, {75, 51, 75, 94}, {75, 52, 75, 94}, {75, 53, 75, 94}, {75, 54, 75, 94},
			{75, 55, 75, 94}, {75, 56, 75, 94}, {75, 57, 75, 94}, {75, 58, 75, 94}, {75, 59, 75, 94},
			{76, 40, 75, 94}, {76, 41, 75, 94}, {76, 42, 75, 94}, {76, 43, 75, 94}, {76, 44, 75, 94},
			{76, 45, 75, 94}, {76, 46, 75, 94}, {76, 47, 75, 94}, {76, 48, 75, 94}, {76, 49, 75, 94},
			{76, 50, 75, 94}, {76, 51, 75, 94}, {76, 52, 75, 94}, {76, 53, 75, 94}, {76, 54, 75, 94},
			{76, 55, 75, 94}, {76, 56, 75, 94}, {76, 57, 75, 94}, {76, 58, 75, 94}, {76, 59, 75, 94},
			{77, 40, 75, 94}, {77, 41, 75, 94}, {77, 42, 75, 94}, {77, 43, 75, 94}, {77, 44, 75, 94},
			{77, 45, 75, 94}, {77, 46, 75, 94}, {77, 47, 75, 94}, {77, 48, 75, 94}, {77, 49, 75, 94},
			{77, 50, 75, 94}, {77, 51, 75, 94}, {77, 52, 75, 94}, {77, 53, 75, 94}, {77, 54, 75, 94},
			{77, 55, 75, 94}, {77, 56, 75, 94}, {77, 57, 75, 94}, {77, 58, 75, 94}, {77, 59, 75, 94},
			{78, 40, 75, 94}, {78, 41, 75, 94}, {78, 42, 75, 94}, {78, 43, 75, 94}, {78, 44, 75, 94},
			{78, 45, 75, 94}, {78, 46, 75, 94}, {78, 47, 75, 94}, {78, 48, 75, 94}, {78, 49, 75, 94},
			{78, 50, 75, 94}, {78, 51, 75, 94}, {78, 52, 75, 94}, {78, 53, 75, 94}, {78, 54, 75, 94},
			{78, 55, 75, 94}, {78, 56, 75, 94}, {78, 57, 75, 94}, {78, 58, 75, 94}, {78, 59, 75, 94},
			{79, 40, 75, 94}, {79, 41, 75, 94}, {79, 42, 75, 94}, {79, 43, 75, 94}, {79, 44, 75, 94},
			{79, 45, 75, 94}, {79, 46, 75, 94}, {79, 47, 75, 94}, {79, 48, 75, 94}, {79, 49, 75, 94},
			{79, 50, 75, 94}, {79, 51, 75, 94}, {79, 52, 75, 94}, {79, 53, 75, 94}, {79, 54, 75, 94},
			{79, 55, 75, 94}, {79, 56, 75, 94}, {79, 57, 75, 94}, {79, 58, 75, 94}, {79, 59, 75, 94},
			{80, 40, 75, 80}, {80, 40, 87, 89}, {80, 40, 93, 94},
		},
	}
	bodysplit = testBody{
		label:  5,
		offset: dvid.Point3d{75, 40, 80},
		size:   dvid.Point3d{20, 20, 10},
		blockSpans: []dvid.Span{
			{2, 1, 2, 2},
		},
		voxelSpans: []dvid.Span{
			{80, 40, 81, 86}, {80, 40, 90, 92}, // These first 2 test splits interleaved in one span.
			{80, 41, 75, 94}, {80, 42, 75, 94}, {80, 43, 75, 94}, {80, 44, 75, 94},
			{80, 45, 75, 94}, {80, 46, 75, 94}, {80, 47, 75, 94}, {80, 48, 75, 94}, {80, 49, 75, 94},
			{80, 50, 75, 94}, {80, 51, 75, 94}, {80, 52, 75, 94}, {80, 53, 75, 94}, {80, 54, 75, 94},
			{80, 55, 75, 94}, {80, 56, 75, 94}, {80, 57, 75, 94}, {80, 58, 75, 94}, {80, 59, 75, 94},
			{81, 40, 75, 94}, {81, 41, 75, 94}, {81, 42, 75, 94}, {81, 43, 75, 94}, {81, 44, 75, 94},
			{81, 45, 75, 94}, {81, 46, 75, 94}, {81, 47, 75, 94}, {81, 48, 75, 94}, {81, 49, 75, 94},
			{81, 50, 75, 94}, {81, 51, 75, 94}, {81, 52, 75, 94}, {81, 53, 75, 94}, {81, 54, 75, 94},
			{81, 55, 75, 94}, {81, 56, 75, 94}, {81, 57, 75, 94}, {81, 58, 75, 94}, {81, 59, 75, 94},
			{82, 40, 75, 94}, {82, 41, 75, 94}, {82, 42, 75, 94}, {82, 43, 75, 94}, {82, 44, 75, 94},
			{82, 45, 75, 94}, {82, 46, 75, 94}, {82, 47, 75, 94}, {82, 48, 75, 94}, {82, 49, 75, 94},
			{82, 50, 75, 94}, {82, 51, 75, 94}, {82, 52, 75, 94}, {82, 53, 75, 94}, {82, 54, 75, 94},
			{82, 55, 75, 94}, {82, 56, 75, 94}, {82, 57, 75, 94}, {82, 58, 75, 94}, {82, 59, 75, 94},
			{83, 40, 75, 94}, {83, 41, 75, 94}, {83, 42, 75, 94}, {83, 43, 75, 94}, {83, 44, 75, 94},
			{83, 45, 75, 94}, {83, 46, 75, 94}, {83, 47, 75, 94}, {83, 48, 75, 94}, {83, 49, 75, 94},
			{83, 50, 75, 94}, {83, 51, 75, 94}, {83, 52, 75, 94}, {83, 53, 75, 94}, {83, 54, 75, 94},
			{83, 55, 75, 94}, {83, 56, 75, 94}, {83, 57, 75, 94}, {83, 58, 75, 94}, {83, 59, 75, 94},
			{84, 40, 75, 94}, {84, 41, 75, 94}, {84, 42, 75, 94}, {84, 43, 75, 94}, {84, 44, 75, 94},
			{84, 45, 75, 94}, {84, 46, 75, 94}, {84, 47, 75, 94}, {84, 48, 75, 94}, {84, 49, 75, 94},
			{84, 50, 75, 94}, {84, 51, 75, 94}, {84, 52, 75, 94}, {84, 53, 75, 94}, {84, 54, 75, 94},
			{84, 55, 75, 94}, {84, 56, 75, 94}, {84, 57, 75, 94}, {84, 58, 75, 94}, {84, 59, 75, 94},
			{85, 40, 75, 94}, {85, 41, 75, 94}, {85, 42, 75, 94}, {85, 43, 75, 94}, {85, 44, 75, 94},
			{85, 45, 75, 94}, {85, 46, 75, 94}, {85, 47, 75, 94}, {85, 48, 75, 94}, {85, 49, 75, 94},
			{85, 50, 75, 94}, {85, 51, 75, 94}, {85, 52, 75, 94}, {85, 53, 75, 94}, {85, 54, 75, 94},
			{85, 55, 75, 94}, {85, 56, 75, 94}, {85, 57, 75, 94}, {85, 58, 75, 94}, {85, 59, 75, 94},
			{86, 40, 75, 94}, {86, 41, 75, 94}, {86, 42, 75, 94}, {86, 43, 75, 94}, {86, 44, 75, 94},
			{86, 45, 75, 94}, {86, 46, 75, 94}, {86, 47, 75, 94}, {86, 48, 75, 94}, {86, 49, 75, 94},
			{86, 50, 75, 94}, {86, 51, 75, 94}, {86, 52, 75, 94}, {86, 53, 75, 94}, {86, 54, 75, 94},
			{86, 55, 75, 94}, {86, 56, 75, 94}, {86, 57, 75, 94}, {86, 58, 75, 94}, {86, 59, 75, 94},
			{87, 40, 75, 94}, {87, 41, 75, 94}, {87, 42, 75, 94}, {87, 43, 75, 94}, {87, 44, 75, 94},
			{87, 45, 75, 94}, {87, 46, 75, 94}, {87, 47, 75, 94}, {87, 48, 75, 94}, {87, 49, 75, 94},
			{87, 50, 75, 94}, {87, 51, 75, 94}, {87, 52, 75, 94}, {87, 53, 75, 94}, {87, 54, 75, 94},
			{87, 55, 75, 94}, {87, 56, 75, 94}, {87, 57, 75, 94}, {87, 58, 75, 94}, {87, 59, 75, 94},
			{88, 40, 75, 94}, {88, 41, 75, 94}, {88, 42, 75, 94}, {88, 43, 75, 94}, {88, 44, 75, 94},
			{88, 45, 75, 94}, {88, 46, 75, 94}, {88, 47, 75, 94}, {88, 48, 75, 94}, {88, 49, 75, 94},
			{88, 50, 75, 94}, {88, 51, 75, 94}, {88, 52, 75, 94}, {88, 53, 75, 94}, {88, 54, 75, 94},
			{88, 55, 75, 94}, {88, 56, 75, 94}, {88, 57, 75, 94}, {88, 58, 75, 94}, {88, 59, 75, 94},
			{89, 40, 75, 94}, {89, 41, 75, 94}, {89, 42, 75, 94}, {89, 43, 75, 94}, {89, 44, 75, 94},
			{89, 45, 75, 94}, {89, 46, 75, 94}, {89, 47, 75, 94}, {89, 48, 75, 94}, {89, 49, 75, 94},
			{89, 50, 75, 94}, {89, 51, 75, 94}, {89, 52, 75, 94}, {89, 53, 75, 94}, {89, 54, 75, 94},
			{89, 55, 75, 94}, {89, 56, 75, 94}, {89, 57, 75, 94}, {89, 58, 75, 94}, {89, 59, 75, 94},
		},
	}
	body6 = testBody{
		label:  6,
		offset: dvid.Point3d{8, 10, 7},
		size:   dvid.Point3d{52, 50, 10},
		blockSpans: []dvid.Span{
			{0, 0, 0, 1},
			{0, 1, 0, 1},
		},
		voxelSpans: []dvid.Span{
			{8, 11, 9, 31}, {8, 12, 9, 59}, {8, 13, 9, 59}, {8, 14, 9, 59},
			{8, 15, 19, 59}, {8, 16, 19, 59}, {8, 17, 19, 59}, {8, 18, 19, 59},
			{8, 19, 29, 59}, {8, 20, 29, 59}, {8, 21, 29, 59}, {8, 22, 29, 59},
			{8, 23, 39, 59}, {8, 24, 39, 59}, {8, 25, 39, 59}, {8, 26, 39, 59},
			{8, 23, 39, 59}, {8, 24, 39, 59}, {8, 25, 39, 59}, {8, 26, 39, 59},
			{8, 27, 39, 59}, {8, 28, 39, 59}, {8, 29, 39, 59}, {8, 30, 39, 59},
			{8, 31, 39, 59}, {8, 32, 39, 59}, {8, 33, 39, 59}, {8, 34, 39, 59},
			{8, 35, 39, 59}, {8, 36, 39, 59}, {8, 37, 45, 59}, {8, 38, 39, 59},
			{8, 39, 39, 59}, {8, 40, 39, 59}, {8, 41, 42, 59}, {8, 42, 39, 56},
			{8, 43, 39, 59}, {8, 44, 39, 59}, {8, 45, 39, 59}, {8, 46, 39, 50},

			{8, 11, 9, 59}, {8, 12, 9, 59}, {8, 13, 9, 59}, {8, 14, 9, 59},
			{8, 15, 19, 59}, {8, 16, 19, 59}, {8, 17, 19, 59}, {8, 18, 19, 59},
			{8, 19, 29, 59}, {8, 20, 29, 59}, {8, 21, 29, 59}, {8, 22, 29, 59},
			{8, 23, 39, 59}, {8, 24, 39, 59}, {8, 25, 39, 59}, {8, 26, 39, 59},
			{8, 23, 39, 59}, {8, 24, 39, 59}, {8, 25, 39, 59}, {8, 26, 39, 59},
			{8, 27, 39, 59}, {8, 28, 39, 59}, {8, 29, 39, 59}, {8, 30, 39, 59},
			{8, 31, 39, 59}, {8, 32, 39, 59}, {8, 33, 39, 59}, {8, 34, 39, 59},
			{8, 35, 39, 59}, {8, 36, 39, 59}, {8, 37, 45, 59}, {8, 38, 39, 59},
			{8, 39, 39, 59}, {8, 40, 39, 59}, {8, 41, 42, 59}, {8, 42, 39, 56},
			{8, 43, 39, 59}, {8, 44, 39, 59}, {8, 45, 39, 59}, {8, 46, 39, 50},

			{9, 11, 9, 59}, {9, 12, 9, 59}, {9, 13, 9, 59}, {9, 14, 9, 59},
			{9, 15, 19, 59}, {9, 16, 19, 59}, {9, 17, 19, 59}, {9, 18, 19, 59},
			{9, 19, 29, 59}, {9, 20, 29, 59}, {9, 21, 29, 59}, {9, 22, 29, 59},
			{9, 23, 39, 59}, {9, 24, 39, 59}, {9, 25, 39, 59}, {9, 26, 39, 59},
			{9, 23, 39, 59}, {9, 24, 39, 59}, {9, 25, 39, 59}, {9, 26, 39, 59},
			{9, 27, 39, 59}, {9, 28, 39, 59}, {9, 29, 39, 59}, {9, 30, 39, 59},
			{9, 31, 39, 59}, {9, 32, 39, 59}, {9, 33, 39, 59}, {9, 34, 39, 59},
			{9, 35, 39, 59}, {9, 36, 39, 59}, {9, 37, 45, 59}, {9, 38, 39, 59},
			{9, 39, 39, 59}, {9, 40, 39, 59}, {9, 41, 42, 59}, {9, 42, 39, 56},
			{9, 43, 39, 59}, {9, 44, 39, 59}, {9, 45, 39, 59}, {9, 46, 39, 50},

			{10, 11, 9, 59}, {10, 12, 9, 59}, {10, 13, 9, 59}, {10, 14, 9, 59},
			{10, 15, 19, 59}, {10, 16, 19, 59}, {10, 17, 19, 59}, {10, 18, 19, 59},
			{10, 19, 29, 59}, {10, 20, 29, 59}, {10, 21, 29, 59}, {10, 22, 29, 59},
			{10, 23, 39, 59}, {10, 24, 39, 59}, {10, 25, 39, 59}, {10, 26, 39, 59},
			{10, 23, 39, 59}, {10, 24, 39, 59}, {10, 25, 39, 59}, {10, 26, 39, 59},
			{10, 27, 39, 59}, {10, 28, 39, 59}, {10, 29, 39, 59}, {10, 30, 39, 59},
			{10, 31, 39, 59}, {10, 32, 39, 59}, {10, 33, 39, 59}, {10, 34, 39, 59},
			{10, 35, 39, 59}, {10, 36, 39, 59}, {10, 37, 45, 59}, {10, 38, 39, 59},
			{10, 39, 39, 59}, {10, 40, 39, 59}, {10, 41, 42, 59}, {10, 42, 39, 56},
			{10, 43, 39, 59}, {10, 44, 39, 59}, {10, 45, 39, 59}, {10, 46, 39, 50},

			{11, 11, 9, 59}, {11, 12, 9, 59}, {11, 13, 9, 59}, {11, 14, 9, 59},
			{11, 15, 19, 59}, {11, 16, 19, 59}, {11, 17, 19, 59}, {11, 18, 19, 59},
			{11, 19, 29, 59}, {11, 20, 29, 59}, {11, 21, 29, 59}, {11, 22, 29, 59},
			{11, 23, 39, 59}, {11, 24, 39, 59}, {11, 25, 39, 59}, {11, 26, 39, 59},
			{11, 23, 39, 59}, {11, 24, 39, 59}, {11, 25, 39, 59}, {11, 26, 39, 59},
			{11, 27, 39, 59}, {11, 28, 39, 59}, {11, 29, 39, 59}, {11, 30, 39, 59},
			{11, 31, 39, 59}, {11, 32, 39, 59}, {11, 33, 39, 59}, {11, 34, 39, 59},
			{11, 35, 39, 59}, {11, 36, 39, 59}, {11, 37, 45, 59}, {11, 38, 39, 59},
			{11, 39, 39, 59}, {11, 40, 39, 59}, {11, 41, 42, 59}, {11, 42, 39, 56},
			{11, 43, 39, 59}, {11, 44, 39, 59}, {11, 45, 39, 59}, {11, 46, 39, 50},

			{12, 11, 9, 59}, {12, 12, 9, 59}, {12, 13, 9, 59}, {12, 14, 9, 59},
			{12, 15, 19, 59}, {12, 16, 19, 59}, {12, 17, 19, 59}, {12, 18, 19, 59},
			{12, 19, 29, 59}, {12, 20, 29, 59}, {12, 21, 29, 59}, {12, 22, 29, 59},
			{12, 23, 39, 59}, {12, 24, 39, 59}, {12, 25, 39, 59}, {12, 26, 39, 59},
			{12, 23, 39, 59}, {12, 24, 39, 59}, {12, 25, 39, 59}, {12, 26, 39, 59},
			{12, 27, 39, 59}, {12, 28, 39, 59}, {12, 29, 39, 59}, {12, 30, 39, 59},
			{12, 31, 39, 59}, {12, 32, 39, 59}, {12, 33, 39, 59}, {12, 34, 39, 59},
			{12, 35, 39, 59}, {12, 36, 39, 59}, {12, 37, 45, 59}, {12, 38, 39, 59},
			{12, 39, 39, 59}, {12, 40, 39, 59}, {12, 41, 42, 59}, {12, 42, 39, 56},
			{12, 43, 39, 59}, {12, 44, 39, 59}, {12, 45, 39, 59}, {12, 46, 39, 50},
		},
	}
	body7 = testBody{
		label:  7,
		offset: dvid.Point3d{68, 10, 7},
		size:   dvid.Point3d{52, 50, 10},
		blockSpans: []dvid.Span{
			{2, 0, 0, 1},
			{2, 1, 0, 1},
		},
		voxelSpans: []dvid.Span{
			{78, 11, 9, 59}, {78, 12, 9, 59}, {78, 13, 9, 59}, {78, 14, 9, 59},
			{78, 15, 19, 59}, {78, 16, 19, 59}, {78, 17, 19, 59}, {78, 18, 19, 59},
			{78, 19, 29, 59}, {78, 20, 29, 59}, {78, 21, 29, 59}, {78, 22, 29, 59},
			{78, 23, 39, 59}, {78, 24, 39, 59}, {78, 25, 39, 59}, {78, 26, 39, 59},
			{78, 23, 39, 59}, {78, 24, 39, 59}, {78, 25, 39, 59}, {78, 26, 39, 59},
			{78, 27, 39, 59}, {78, 28, 39, 59}, {78, 29, 39, 59}, {78, 30, 39, 59},
			{78, 31, 39, 59}, {78, 32, 39, 59}, {78, 33, 39, 59}, {78, 34, 39, 59},
			{78, 35, 39, 59}, {78, 36, 39, 59}, {78, 37, 45, 59}, {78, 38, 39, 59},
			{78, 39, 39, 59}, {78, 40, 39, 59}, {78, 41, 42, 59}, {78, 42, 39, 56},
			{78, 43, 39, 59}, {78, 44, 39, 59}, {78, 45, 39, 59}, {78, 46, 39, 50},

			{79, 11, 9, 59}, {79, 12, 9, 59}, {79, 13, 9, 59}, {79, 14, 9, 59},
			{79, 15, 19, 59}, {79, 16, 19, 59}, {79, 17, 19, 59}, {79, 18, 19, 59},
			{79, 19, 29, 59}, {79, 20, 29, 59}, {79, 21, 29, 59}, {79, 22, 29, 59},
			{79, 23, 39, 59}, {79, 24, 39, 59}, {79, 25, 39, 59}, {79, 26, 39, 59},
			{79, 23, 39, 59}, {79, 24, 39, 59}, {79, 25, 39, 59}, {79, 26, 39, 59},
			{79, 27, 39, 59}, {79, 28, 39, 59}, {79, 29, 39, 59}, {79, 30, 39, 59},
			{79, 31, 39, 59}, {79, 32, 39, 59}, {79, 33, 39, 59}, {79, 34, 39, 59},
			{79, 35, 39, 59}, {79, 36, 39, 59}, {79, 37, 45, 59}, {79, 38, 39, 59},
			{79, 39, 39, 59}, {79, 40, 39, 59}, {79, 41, 42, 59}, {79, 42, 39, 56},
			{79, 43, 39, 59}, {79, 44, 39, 59}, {79, 45, 39, 59}, {79, 46, 39, 50},

			{80, 11, 9, 59}, {80, 12, 9, 59}, {80, 13, 9, 59}, {80, 14, 9, 59},
			{80, 15, 19, 59}, {80, 16, 19, 59}, {80, 17, 19, 59}, {80, 18, 19, 59},
			{80, 19, 29, 59}, {80, 20, 29, 59}, {80, 21, 29, 59}, {80, 22, 29, 59},
			{80, 23, 39, 59}, {80, 24, 39, 59}, {80, 25, 39, 59}, {80, 26, 39, 59},
			{80, 23, 39, 59}, {80, 24, 39, 59}, {80, 25, 39, 59}, {80, 26, 39, 59},
			{80, 27, 39, 59}, {80, 28, 39, 59}, {80, 29, 39, 59}, {80, 30, 39, 59},
			{80, 31, 39, 59}, {80, 32, 39, 59}, {80, 33, 39, 59}, {80, 34, 39, 59},
			{80, 35, 39, 59}, {80, 36, 39, 59}, {80, 37, 45, 59}, {80, 38, 39, 59},
			{80, 39, 39, 59}, {80, 40, 39, 59}, {80, 41, 42, 59}, {80, 42, 39, 56},
			{80, 43, 39, 59}, {80, 44, 39, 59}, {80, 45, 39, 59}, {80, 46, 39, 50},

			{81, 11, 9, 59}, {81, 12, 9, 59}, {81, 13, 9, 59}, {81, 14, 9, 59},
			{81, 15, 19, 59}, {81, 16, 19, 59}, {81, 17, 19, 59}, {81, 18, 19, 59},
			{81, 19, 29, 59}, {81, 20, 29, 59}, {81, 21, 29, 59}, {81, 22, 29, 59},
			{81, 23, 39, 59}, {81, 24, 39, 59}, {81, 25, 39, 59}, {81, 26, 39, 59},
			{81, 23, 39, 59}, {81, 24, 39, 59}, {81, 25, 39, 59}, {81, 26, 39, 59},
			{81, 27, 39, 59}, {81, 28, 39, 59}, {81, 29, 39, 59}, {81, 30, 39, 59},
			{81, 31, 39, 59}, {81, 32, 39, 59}, {81, 33, 39, 59}, {81, 34, 39, 59},
			{81, 35, 39, 59}, {81, 36, 39, 59}, {81, 37, 45, 59}, {81, 38, 39, 59},
			{81, 39, 39, 59}, {81, 40, 39, 59}, {81, 41, 42, 59}, {81, 42, 39, 56},
			{81, 43, 39, 59}, {81, 44, 39, 59}, {81, 45, 39, 59}, {81, 46, 39, 50},

			{82, 11, 9, 59}, {82, 12, 9, 59}, {82, 13, 9, 59}, {82, 14, 9, 59},
			{82, 15, 19, 59}, {82, 16, 19, 59}, {82, 17, 19, 59}, {82, 18, 19, 59},
			{82, 19, 29, 59}, {82, 20, 29, 59}, {82, 21, 29, 59}, {82, 22, 29, 59},
			{82, 23, 39, 59}, {82, 24, 39, 59}, {82, 25, 39, 59}, {82, 26, 39, 59},
			{82, 23, 39, 59}, {82, 24, 39, 59}, {82, 25, 39, 59}, {82, 26, 39, 59},
			{82, 27, 39, 59}, {82, 28, 39, 59}, {82, 29, 39, 59}, {82, 30, 39, 59},
			{82, 31, 39, 59}, {82, 32, 39, 59}, {82, 33, 39, 59}, {82, 34, 39, 59},
			{82, 35, 39, 59}, {82, 36, 39, 59}, {82, 37, 45, 59}, {82, 38, 39, 59},
			{82, 39, 39, 59}, {82, 40, 39, 59}, {82, 41, 42, 59}, {82, 42, 39, 56},
			{82, 43, 39, 59}, {82, 44, 39, 59}, {82, 45, 39, 59}, {82, 46, 39, 50},
		},
	}
	bodies = []testBody{
		body1, body2, body3, body4, bodysplit, body6, body7,
	}
)