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/raw_test.go

@@ -0,0 +1,28 @@
+package graphson
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRawMessageEncoding(t *testing.T) {
+	var s struct{ M RawMessage }
+	got, err := MarshalToString(s)
+	require.NoError(t, err)
+	assert.Equal(t, `{"M":null}`, got)
+
+	s.M = []byte(`"155a"`)
+	got, err = MarshalToString(s)
+	require.NoError(t, err)
+	assert.JSONEq(t, `{"M": "155a"}`, got)
+
+	err = (*RawMessage)(nil).UnmarshalGraphson(s.M)
+	assert.Error(t, err)
+
+	s.M = nil
+	err = UnmarshalFromString(got, &s)
+	require.NoError(t, err)
+	assert.Equal(t, `"155a"`, string(s.M))
+}