func TestMultipleConstraintParse(t *testing.T) {
qs, _ := graph.NewQuadStore("memstore", "", nil)
w, _ := graph.NewQuadWriter("single", qs, nil)
for _, tv := range []quad.Quad{
quad.Make("i", "like", "food", ""),
quad.Make("i", "like", "beer", ""),
quad.Make("you", "like", "beer", ""),
} {
w.WriteQuad(tv)
}
query := `(
$a
(:like :beer)
(:like "food")
)`
it := BuildIteratorTreeForQuery(qs, query)
if it.Type() != graph.And {
t.Errorf("Odd iterator tree. Got: %#v", it.Describe())
}
if !graph.Next(it) {
t.Error("Got no results")
}
out := it.Result()
if out != qs.ValueOf(quad.Raw("i")) {
t.Errorf("Got %d, expected %d", out, qs.ValueOf(quad.Raw("i")))
}
if graph.Next(it) {
t.Error("Too many results")
}
}
func TestIterators(t *testing.T) {
qs, opts, closer := makeGAE(t)
defer closer()
graphtest.MakeWriter(t, qs, opts, graphtest.MakeQuadSet()...)
require.Equal(t, int64(11), qs.Size(), "Incorrect number of quads")
var expected = []quad.Quad{
quad.Make("C", "follows", "B", ""),
quad.Make("C", "follows", "D", ""),
}
it := qs.QuadIterator(quad.Subject, qs.ValueOf(quad.Raw("C")))
graphtest.ExpectIteratedQuads(t, qs, it, expected)
// Test contains
it = qs.QuadIterator(quad.Label, qs.ValueOf(quad.Raw("status_graph")))
gqs := qs.(*QuadStore)
key := gqs.createKeyForQuad(quad.Make("G", "status", "cool", "status_graph"))
token := &Token{quadKind, key.StringID()}
require.True(t, it.Contains(token), "Contains failed")
// Test cloning an iterator
var it2 graph.Iterator
it2 = it.Clone()
x := it2.Describe()
y := it.Describe()
require.Equal(t, y.Name, x.Name, "Iterator Clone was not successful")
}
func TestRemoveQuad(t *testing.T) {
qs, w, _ := makeTestStore(simpleGraph)
err := w.RemoveQuad(quad.Make(
"E",
"follows",
"F",
"",
))
if err != nil {
t.Error("Couldn't remove quad", err)
}
fixed := qs.FixedIterator()
fixed.Add(qs.ValueOf(quad.Raw("E")))
fixed2 := qs.FixedIterator()
fixed2.Add(qs.ValueOf(quad.Raw("follows")))
innerAnd := iterator.NewAnd(qs)
innerAnd.AddSubIterator(iterator.NewLinksTo(qs, fixed, quad.Subject))
innerAnd.AddSubIterator(iterator.NewLinksTo(qs, fixed2, quad.Predicate))
hasa := iterator.NewHasA(qs, innerAnd, quad.Object)
newIt, _ := hasa.Optimize()
if graph.Next(newIt) {
t.Error("E should not have any followers.")
}
}
func TestDeletedFromIterator(t testing.TB, gen DatabaseFunc) {
qs, opts, closer := gen(t)
defer closer()
w := MakeWriter(t, qs, opts, MakeQuadSet()...)
// Subject iterator.
it := qs.QuadIterator(quad.Subject, qs.ValueOf(quad.Raw("E")))
ExpectIteratedQuads(t, qs, it, []quad.Quad{
quad.Make("E", "follows", "F", ""),
})
it.Reset()
w.RemoveQuad(quad.Make("E", "follows", "F", ""))
ExpectIteratedQuads(t, qs, it, nil)
}
func TestTreeConstraintTagParse(t *testing.T) {
qs, _ := graph.NewQuadStore("memstore", "", nil)
w, _ := graph.NewQuadWriter("single", qs, nil)
w.WriteQuad(quad.Make("i", "like", "food", ""))
w.WriteQuad(quad.Make("food", "is", "good", ""))
query := "(\"i\"\n" +
"(:like\n" +
"($a (:is :good))))"
it := BuildIteratorTreeForQuery(qs, query)
if !graph.Next(it) {
t.Error("Got no results")
}
tags := make(map[string]graph.Value)
it.TagResults(tags)
if qs.NameOf(tags["$a"]).String() != "food" {
t.Errorf("Got %s, expected food", qs.NameOf(tags["$a"]))
}
}
func TestTreeConstraintParse(t *testing.T) {
qs, _ := graph.NewQuadStore("memstore", "", nil)
w, _ := graph.NewQuadWriter("single", qs, nil)
w.WriteQuad(quad.Make("i", "like", "food", ""))
w.WriteQuad(quad.Make("food", "is", "good", ""))
query := "(\"i\"\n" +
"(:like\n" +
"($a (:is :good))))"
it := BuildIteratorTreeForQuery(qs, query)
if it.Type() != graph.And {
t.Errorf("Odd iterator tree. Got: %#v", it.Describe())
}
if !graph.Next(it) {
t.Error("Got no results")
}
out := it.Result()
if out != qs.ValueOf(quad.Raw("i")) {
t.Errorf("Got %d, expected %d", out, qs.ValueOf(quad.Raw("i")))
}
}
func TestTransaction(t *testing.T) {
qs, w, _ := makeTestStore(simpleGraph)
size := qs.Size()
tx := graph.NewTransaction()
tx.AddQuad(quad.Make(
"E",
"follows",
"G",
""))
tx.RemoveQuad(quad.Make(
"Non",
"existent",
"quad",
""))
err := w.ApplyTransaction(tx)
if err == nil {
t.Error("Able to remove a non-existent quad")
}
if size != qs.Size() {
t.Error("Appended a new quad in a failed transaction")
}
}
func TestLoadOneQuad(t testing.TB, gen DatabaseFunc) {
qs, opts, closer := gen(t)
defer closer()
w := MakeWriter(t, qs, opts)
err := w.AddQuad(quad.Make(
"Something",
"points_to",
"Something Else",
"context",
))
require.Nil(t, err)
for _, pq := range []string{"Something", "points_to", "Something Else", "context"} {
got := quad.StringOf(qs.NameOf(qs.ValueOf(quad.Raw(pq))))
require.Equal(t, pq, got, "Failed to roundtrip %q", pq)
}
require.Equal(t, int64(1), qs.Size(), "Unexpected quadstore size")
}
func TestHorizonInt(t testing.TB, gen DatabaseFunc, conf *Config) {
qs, opts, closer := gen(t)
defer closer()
w := MakeWriter(t, qs, opts)
horizon := qs.Horizon()
require.Equal(t, int64(0), horizon.Int(), "Unexpected horizon value")
err := w.AddQuadSet(MakeQuadSet())
require.Nil(t, err)
require.Equal(t, int64(11), qs.Size(), "Unexpected quadstore size")
if qss, ok := qs.(ValueSizer); ok {
s := qss.SizeOf(qs.ValueOf(quad.Raw("B")))
require.Equal(t, int64(5), s, "Unexpected quadstore value size")
}
horizon = qs.Horizon()
require.Equal(t, int64(11), horizon.Int(), "Unexpected horizon value")
err = w.RemoveQuad(quad.Make(
"A",
"follows",
"B",
"",
))
require.Nil(t, err)
if !conf.SkipSizeCheckAfterDelete {
require.Equal(t, int64(10), qs.Size(), "Unexpected quadstore size after RemoveQuad")
} else {
require.Equal(t, int64(11), qs.Size(), "Unexpected quadstore size")
}
if qss, ok := qs.(ValueSizer); ok {
s := qss.SizeOf(qs.ValueOf(quad.Raw("B")))
require.Equal(t, int64(4), s, "Unexpected quadstore value size")
}
}
func Quad(subject, predicate, object, label string) quad.Quad {
return quad.Make(subject, predicate, object, label)
}
)
var readTests = []struct {
message string
input string
expect []quad.Quad
err error
}{
{
message: "parse correct JSON",
input: `[
{"subject": "foo", "predicate": "bar", "object": "baz"},
{"subject": "foo", "predicate": "bar", "object": "baz", "label": "graph"}
]`,
expect: []quad.Quad{
quad.Make("foo", "bar", "baz", ""),
quad.Make("foo", "bar", "baz", "graph"),
},
err: nil,
},
{
message: "parse correct JSON with extra field",
input: `[
{"subject": "foo", "predicate": "bar", "object": "foo", "something_else": "extra data"}
]`,
expect: []quad.Quad{
quad.Make("foo", "bar", "foo", ""),
},
err: nil,
},
{
func TestSetIterator(t testing.TB, gen DatabaseFunc) {
qs, opts, closer := gen(t)
defer closer()
MakeWriter(t, qs, opts, MakeQuadSet()...)
expectIteratedQuads := func(it graph.Iterator, exp []quad.Quad) {
ExpectIteratedQuads(t, qs, it, exp)
}
// Subject iterator.
it := qs.QuadIterator(quad.Subject, qs.ValueOf(quad.Raw("C")))
expectIteratedQuads(it, []quad.Quad{
quad.Make("C", "follows", "B", ""),
quad.Make("C", "follows", "D", ""),
})
it.Reset()
and := iterator.NewAnd(qs)
and.AddSubIterator(qs.QuadsAllIterator())
and.AddSubIterator(it)
expectIteratedQuads(and, []quad.Quad{
quad.Make("C", "follows", "B", ""),
quad.Make("C", "follows", "D", ""),
})
// Object iterator.
it = qs.QuadIterator(quad.Object, qs.ValueOf(quad.Raw("F")))
expectIteratedQuads(it, []quad.Quad{
quad.Make("B", "follows", "F", ""),
quad.Make("E", "follows", "F", ""),
})
and = iterator.NewAnd(qs)
and.AddSubIterator(qs.QuadIterator(quad.Subject, qs.ValueOf(quad.Raw("B"))))
and.AddSubIterator(it)
expectIteratedQuads(and, []quad.Quad{
quad.Make("B", "follows", "F", ""),
})
// Predicate iterator.
it = qs.QuadIterator(quad.Predicate, qs.ValueOf(quad.Raw("status")))
expectIteratedQuads(it, []quad.Quad{
quad.Make("B", "status", "cool", "status_graph"),
quad.Make("D", "status", "cool", "status_graph"),
quad.Make("G", "status", "cool", "status_graph"),
})
// Label iterator.
it = qs.QuadIterator(quad.Label, qs.ValueOf(quad.Raw("status_graph")))
expectIteratedQuads(it, []quad.Quad{
quad.Make("B", "status", "cool", "status_graph"),
quad.Make("D", "status", "cool", "status_graph"),
quad.Make("G", "status", "cool", "status_graph"),
})
it.Reset()
// Order is important
and = iterator.NewAnd(qs)
and.AddSubIterator(qs.QuadIterator(quad.Subject, qs.ValueOf(quad.Raw("B"))))
and.AddSubIterator(it)
expectIteratedQuads(and, []quad.Quad{
quad.Make("B", "status", "cool", "status_graph"),
})
it.Reset()
// Order is important
and = iterator.NewAnd(qs)
and.AddSubIterator(it)
and.AddSubIterator(qs.QuadIterator(quad.Subject, qs.ValueOf(quad.Raw("B"))))
expectIteratedQuads(and, []quad.Quad{
quad.Make("B", "status", "cool", "status_graph"),
})
}
// This is a simple test graph.
//
// +---+ +---+
// | A |------- ->| F |<--
// +---+ \------>+---+-/ +---+ \--+---+
// ------>|#B#| | | E |
// +---+-------/ >+---+ | +---+
// | C | / v
// +---+ -/ +---+
// ---- +---+/ |#G#|
// \-->|#D#|------------->+---+
// +---+
//
var simpleGraph = graphtest.MakeQuadSet()
var simpleGraphUpdate = []quad.Quad{
quad.Make("A", "follows", "B", ""),
quad.Make("F", "follows", "B", ""),
quad.Make("C", "follows", "D", ""),
quad.Make("X", "follows", "B", ""),
}
type pair struct {
query string
value int64
}
func makeTestStore(data []quad.Quad, opts graph.Options) (graph.QuadStore, graph.QuadWriter, []pair) {
seen := make(map[quad.Value]struct{})
qs, _ := newQuadStore("", opts)
qs, _ = newQuadStoreForRequest(qs, opts)
t.Errorf("%+v (%T %T %T %T)", q, q.Subject, q.Predicate, q.Object, q.Label)
}
t.Errorf("case %d failed: wrong quads returned:\n%v\n%v", i, quads, c.expect)
}
r.Close()
}
}
var testWriteCases = []struct {
data []quad.Quad
ctx interface{}
expect string
}{
{
[]quad.Quad{
quad.Make(`<http://example.org/id1>`, `<http://example.org/term1>`, `"v1"^^<http://example.org/datatype>`, ``),
quad.Make(`<http://example.org/id1>`, `<http://example.org/term2>`, `<http://example.org/id2>`, ``),
quad.Make(`<http://example.org/id1>`, `<http://example.org/term3>`, `"v3"@en`, ``),
quad.Make(`<http://example.org/id1>`, `<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>`, `<http://example.org/Type1>`, ``),
quad.Make(`<http://example.org/id1>`, `<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>`, `<http://example.org/Type2>`, ``),
},
map[string]interface{}{
"ex": "http://example.org/",
},
`{
"@context": {
"ex": "http://example.org/"
},
"@id": "ex:id1",
"@type": [
"ex:Type1",
func TestTransaction(t *testing.T) {
var tx *Transaction
// simples adds / removes
tx = NewTransaction()
tx.AddQuad(quad.Make("E", "follows", "F", ""))
tx.AddQuad(quad.Make("F", "follows", "G", ""))
tx.RemoveQuad(quad.Make("A", "follows", "Z", ""))
if len(tx.Deltas) != 3 {
t.Errorf("Expected 3 Deltas, have %d delta(s)", len(tx.Deltas))
}
// add, remove -> nothing
tx = NewTransaction()
tx.AddQuad(quad.Make("E", "follows", "G", ""))
tx.RemoveQuad(quad.Make("E", "follows", "G", ""))
if len(tx.Deltas) != 0 {
t.Errorf("Expected [add, remove]->[], have %d Deltas", len(tx.Deltas))
}
// remove, add -> nothing
tx = NewTransaction()
tx.RemoveQuad(quad.Make("E", "follows", "G", ""))
tx.AddQuad(quad.Make("E", "follows", "G", ""))
if len(tx.Deltas) != 0 {
t.Errorf("Expected [add, remove]->[], have %d delta(s)", len(tx.Deltas))
}
// add x2 -> add x1
tx = NewTransaction()
tx.AddQuad(quad.Make("E", "follows", "G", ""))
tx.AddQuad(quad.Make("E", "follows", "G", ""))
if len(tx.Deltas) != 1 {
t.Errorf("Expected [add, add]->[add], have %d delta(s)", len(tx.Deltas))
}
// remove x2 -> remove x1
tx = NewTransaction()
tx.RemoveQuad(quad.Make("E", "follows", "G", ""))
tx.RemoveQuad(quad.Make("E", "follows", "G", ""))
if len(tx.Deltas) != 1 {
t.Errorf("Expected [remove, remove]->[remove], have %d delta(s)", len(tx.Deltas))
}
// add, remove x2 -> remove x1
tx = NewTransaction()
tx.AddQuad(quad.Make("E", "follows", "G", ""))
tx.RemoveQuad(quad.Make("E", "follows", "G", ""))
tx.RemoveQuad(quad.Make("E", "follows", "G", ""))
if len(tx.Deltas) != 1 {
t.Errorf("Expected [add, remove, remove]->[remove], have %d delta(s)", len(tx.Deltas))
}
}
func TestLoadDatabase(t *testing.T) {
tmpFile, err := ioutil.TempFile(os.TempDir(), "cayley_test")
if err != nil {
t.Fatalf("Could not create working directory: %v", err)
}
defer os.RemoveAll(tmpFile.Name())
t.Log(tmpFile.Name())
err = createNewBolt(tmpFile.Name(), nil)
if err != nil {
t.Fatal("Failed to create Bolt database.", err)
}
qs, err := newQuadStore(tmpFile.Name(), nil)
if qs == nil || err != nil {
t.Error("Failed to create Bolt QuadStore.")
}
w, _ := writer.NewSingleReplication(qs, nil)
w.WriteQuad(quad.Make(
"Something",
"points_to",
"Something Else",
"context",
))
for _, pq := range []string{"Something", "points_to", "Something Else", "context"} {
if got := qs.NameOf(qs.ValueOf(quad.Raw(pq))).String(); got != pq {
t.Errorf("Failed to roundtrip %q, got:%q expect:%q", pq, got, pq)
}
}
if s := qs.Size(); s != 1 {
t.Errorf("Unexpected quadstore size, got:%d expect:1", s)
}
qs.Close()
err = createNewBolt(tmpFile.Name(), nil)
if err != graph.ErrDatabaseExists {
t.Fatal("Failed to create Bolt database.", err)
}
qs, err = newQuadStore(tmpFile.Name(), nil)
if qs == nil || err != nil {
t.Error("Failed to create Bolt QuadStore.")
}
w, _ = writer.NewSingleReplication(qs, nil)
ts2, didConvert := qs.(*QuadStore)
if !didConvert {
t.Errorf("Could not convert from generic to Bolt QuadStore")
}
//Test horizon
horizon := qs.Horizon()
if horizon.Int() != 1 {
t.Errorf("Unexpected horizon value, got:%d expect:1", horizon.Int())
}
w.WriteQuads(graphtest.MakeQuadSet())
if s := qs.Size(); s != 12 {
t.Errorf("Unexpected quadstore size, got:%d expect:12", s)
}
if s := ts2.SizeOf(qs.ValueOf(quad.Raw("B"))); s != 5 {
t.Errorf("Unexpected quadstore size, got:%d expect:5", s)
}
horizon = qs.Horizon()
if horizon.Int() != 12 {
t.Errorf("Unexpected horizon value, got:%d expect:12", horizon.Int())
}
w.RemoveQuad(quad.Make(
"A",
"follows",
"B",
"",
))
if s := qs.Size(); s != 11 {
t.Errorf("Unexpected quadstore size after RemoveQuad, got:%d expect:11", s)
}
if s := ts2.SizeOf(qs.ValueOf(quad.Raw("B"))); s != 4 {
t.Errorf("Unexpected quadstore size, got:%d expect:4", s)
}
qs.Close()
}
// TODO(dennwc): add tests to verify that QS behaves in a right way with IgnoreOptions,
// returns ErrQuadExists, ErrQuadNotExists is doing rollback.
func TestAddRemove(t testing.TB, gen DatabaseFunc, conf *Config) {
qs, opts, closer := gen(t)
defer closer()
if opts == nil {
opts = make(graph.Options)
}
opts["ignore_duplicate"] = true
w := MakeWriter(t, qs, opts, MakeQuadSet()...)
require.Equal(t, int64(11), qs.Size(), "Incorrect number of quads")
all := qs.NodesAllIterator()
expect := []string{
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"cool",
"follows",
"status",
"status_graph",
}
ExpectIteratedRawStrings(t, qs, all, expect)
// Add more quads, some conflicts
err := w.AddQuadSet([]quad.Quad{
quad.Make("A", "follows", "B", ""), // duplicate
quad.Make("F", "follows", "B", ""),
quad.Make("C", "follows", "D", ""), // duplicate
quad.Make("X", "follows", "B", ""),
})
assert.Nil(t, err, "AddQuadSet failed")
assert.Equal(t, int64(13), qs.Size(), "Incorrect number of quads")
all = qs.NodesAllIterator()
expect = []string{
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"X",
"cool",
"follows",
"status",
"status_graph",
}
ExpectIteratedRawStrings(t, qs, all, expect)
// Remove quad
toRemove := quad.Make("X", "follows", "B", "")
err = w.RemoveQuad(toRemove)
require.Nil(t, err, "RemoveQuad failed")
if !conf.SkipNodeDelAfterQuadDel {
expect = []string{
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"cool",
"follows",
"status",
"status_graph",
}
} else {
expect = []string{
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"X",
"cool",
"follows",
"status",
"status_graph",
}
}
ExpectIteratedRawStrings(t, qs, all, nil)
all = qs.NodesAllIterator()
ExpectIteratedRawStrings(t, qs, all, expect)
}
// This is a simple test graph.
//
// +---+ +---+
// | A |------- ->| F |<--
// +---+ \------>+---+-/ +---+ \--+---+
// ------>|#B#| | | E |
// +---+-------/ >+---+ | +---+
// | C | / v
// +---+ -/ +---+
// ---- +---+/ |#G#|
// \-->|#D#|------------->+---+
// +---+
//
func MakeQuadSet() []quad.Quad {
return []quad.Quad{
quad.Make("A", "follows", "B", ""),
quad.Make("C", "follows", "B", ""),
quad.Make("C", "follows", "D", ""),
quad.Make("D", "follows", "B", ""),
quad.Make("B", "follows", "F", ""),
quad.Make("F", "follows", "G", ""),
quad.Make("D", "follows", "G", ""),
quad.Make("E", "follows", "F", ""),
quad.Make("B", "status", "cool", "status_graph"),
quad.Make("D", "status", "cool", "status_graph"),
quad.Make("G", "status", "cool", "status_graph"),
}
}
str := ParseString("()")
if str != "" {
t.Errorf("Unexpected parse result, got:%q", str)
}
}
var testQueries = []struct {
message string
add quad.Quad
query string
typ graph.Type
expect string
}{
{
message: "get a single quad linkage",
add: quad.Make("i", "can", "win", ""),
query: "($a (:can \"win\"))",
typ: graph.And,
expect: "i",
},
{
message: "get a single quad linkage",
add: quad.Make("i", "can", "win", ""),
query: "(\"i\" (:can $a))",
typ: graph.And,
expect: "i",
},
}
func TestMemstoreBackedSexp(t *testing.T) {
qs, _ := graph.NewQuadStore("memstore", "", nil)
"bytes"
"testing"
"github.com/google/cayley/quad"
"github.com/google/cayley/quad/gml"
)
var testData = []struct {
quads []quad.Quad
data string
}{
{
[]quad.Quad{
quad.Make(
"_:subject1",
"</film/performance/character>",
`"Tomas de Torquemada"`,
"",
),
quad.Make(
"_:subject1",
"<http://an.example/predicate1>",
`"object1"`,
"",
),
quad.Make(
"<http://example.org/bob#me>",
"<http://schema.org/birthDate>",
`"1990-07-04"^^<http://www.w3.org/2001/XMLSchema#date>`,
"",
),
},
// This is a simple test graph.
//
// +---+ +---+
// | A |------- ->| F |<--
// +---+ \------>+---+-/ +---+ \--+---+
// ------>|#B#| | | E |
// +---+-------/ >+---+ | +---+
// | C | / v
// +---+ -/ +---+
// ---- +---+/ |#G#|
// \-->|#D#|------------->+---+
// +---+
//
var simpleGraph = []quad.Quad{
quad.Make("A", "follows", "B", ""),
quad.Make("C", "follows", "B", ""),
quad.Make("C", "follows", "D", ""),
quad.Make("D", "follows", "B", ""),
quad.Make("B", "follows", "F", ""),
quad.Make("F", "follows", "G", ""),
quad.Make("D", "follows", "G", ""),
quad.Make("E", "follows", "F", ""),
quad.Make("B", "status", "cool", "status_graph"),
quad.Make("D", "status", "cool", "status_graph"),
quad.Make("G", "status", "cool", "status_graph"),
}
func makeTestSession(data []quad.Quad) *Session {
qs, _ := graph.NewQuadStore("memstore", "", nil)
w, _ := graph.NewQuadWriter("single", qs, nil)
if test.tag == "" {
test.tag = TopResultTag
}
got := runQueryGetTag(rec, simpleGraph, test.query, test.tag)
sort.Strings(got)
sort.Strings(test.expect)
t.Log("testing", test.message)
if !reflect.DeepEqual(got, test.expect) {
t.Errorf("Failed to %s, got: %v expected: %v", test.message, got, test.expect)
}
}()
}
}
var issue160TestGraph = []quad.Quad{
quad.Make("alice", "follows", "bob", ""),
quad.Make("bob", "follows", "alice", ""),
quad.Make("charlie", "follows", "bob", ""),
quad.Make("dani", "follows", "charlie", ""),
quad.Make("dani", "follows", "alice", ""),
quad.Make("alice", "is", "cool", ""),
quad.Make("bob", "is", "not cool", ""),
quad.Make("charlie", "is", "cool", ""),
quad.Make("danie", "is", "not cool", ""),
}
func TestIssue160(t *testing.T) {
query := `g.V().Tag('query').Out('follows').Out('follows').ForEach(function (item) { if (item.id !== item.query) g.Emit({ id: item.id }); })`
expect := []string{
"****\nid : alice\n",
"****\nid : bob\n",