move lib/go/gremlin to ent/dialect (#1192)

Summary:
Pull Request resolved: https://github.com/facebookexternal/fbc/pull/1192

Pull Request resolved: https://github.com/facebookincubator/ent/pull/11

Reviewed By: alexsn

Differential Revision: D16377224

fbshipit-source-id: 07ca7436eb9b64fbe2299568560b91466b2417ba

dialect/gremlin/encoding/graphson/time_test.go

@@ -0,0 +1,32 @@
+package graphson
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestTimeEncoding(t *testing.T) {
+	const ms = 1481750076295
+	ts := time.Unix(0, ms*time.Millisecond.Nanoseconds())
+
+	for _, v := range []interface{}{ts, &ts} {
+		got, err := MarshalToString(v)
+		require.NoError(t, err)
+		assert.JSONEq(t, `{ "@type": "g:Timestamp", "@value": 1481750076295 }`, got)
+	}
+
+	strs := []string{
+		`{ "@type": "g:Timestamp", "@value": 1481750076295 }`,
+		`{ "@type": "g:Date", "@value": 1481750076295 }`,
+	}
+
+	for _, str := range strs {
+		var v time.Time
+		err := UnmarshalFromString(str, &v)
+		assert.NoError(t, err)
+		assert.True(t, ts.Equal(v))
+	}
+}