[#132] v2/refs: Implement stable unmarshaler on Address

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

v2/refs/marshal.go

@@ -2,6 +2,7 @@ package refs
 
 import (
 	"github.com/nspcc-dev/neofs-api-go/util/proto"
+	refs "github.com/nspcc-dev/neofs-api-go/v2/refs/grpc"
 )
 
 const (
@@ -140,6 +141,21 @@ func (a *Address) StableSize() (size int) {
 	return size
 }
 
+func (a *Address) StableUnmarshal(data []byte) error {
+	if a == nil {
+		return nil
+	}
+
+	addrGRPC := new(refs.Address)
+	if err := addrGRPC.Unmarshal(data); err != nil {
+		return err
+	}
+
+	*a = *AddressFromGRPCMessage(addrGRPC)
+
+	return nil
+}
+
 func (c *Checksum) StableMarshal(buf []byte) ([]byte, error) {
 	if c == nil {
 		return []byte{}, nil

v2/refs/marshal_test.go

@@ -63,20 +63,14 @@ func TestObjectID_StableMarshal(t *testing.T) {
 }
 
 func TestAddress_StableMarshal(t *testing.T) {
-	addressFrom := new(refs.Address)
+	cid := []byte("Container ID")
+	oid := []byte("Object ID")
 
-	cnr := new(refs.ContainerID)
+	addressFrom := generateAddress(cid, oid)
-	cnr.SetValue([]byte("Container ID"))
-
-	objectID := new(refs.ObjectID)
-	objectID.SetValue([]byte("Object ID"))
 
 	addressTransport := new(grpc.Address)
 
 	t.Run("non empty", func(t *testing.T) {
-		addressFrom.SetContainerID(cnr)
-		addressFrom.SetObjectID(objectID)
-
 		wire, err := addressFrom.StableMarshal(nil)
 		require.NoError(t, err)
 
@@ -154,3 +148,27 @@ func generateVersion(maj, min uint32) *refs.Version {
 
 	return version
 }
+
+func generateAddress(bCid, bOid []byte) *refs.Address {
+	addr := new(refs.Address)
+
+	cid := new(refs.ContainerID)
+	cid.SetValue(bCid)
+
+	oid := new(refs.ObjectID)
+	oid.SetValue(bOid)
+
+	return addr
+}
+
+func TestAddress_StableUnmarshal(t *testing.T) {
+	addr := generateAddress([]byte("container id"), []byte("object id"))
+
+	data, err := addr.StableMarshal(nil)
+	require.NoError(t, err)
+
+	addr2 := new(refs.Address)
+	require.NoError(t, addr2.StableUnmarshal(data))
+
+	require.Equal(t, addr, addr2)
+}