[#1239] morph/client: Remove intermediate conversion in morph client

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/morph/client/netmap/netmap_test.go

@@ -0,0 +1,50 @@
+package netmap
+
+import (
+	"math/big"
+	"math/rand"
+	"strconv"
+	"testing"
+
+	"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
+	"github.com/nspcc-dev/neofs-sdk-go/netmap"
+	"github.com/stretchr/testify/require"
+)
+
+func Test_stackItemsToNodeInfos(t *testing.T) {
+	expected := make([]netmap.NodeInfo, 4)
+	for i := range expected {
+		pub := make([]byte, 33)
+		rand.Read(pub)
+
+		expected[i].SetState(netmap.NodeState(i % 3))
+		expected[i].SetPublicKey(pub)
+
+		var attr netmap.NodeAttribute
+		attr.SetKey("key")
+		attr.SetValue(strconv.Itoa(i))
+		expected[i].SetAttributes(attr)
+	}
+
+	items := make([]stackitem.Item, 4)
+	for i := range items {
+		data, err := expected[i].Marshal()
+		require.NoError(t, err)
+
+		state := int64(expected[i].State())
+		if state != 0 { // In contract online=1, offline=2, in API it is the other way.
+			state = 3 - state
+		}
+
+		items[i] = stackitem.NewStruct([]stackitem.Item{
+			stackitem.NewStruct([]stackitem.Item{
+				stackitem.NewByteArray(data),
+			}),
+			stackitem.NewBigInteger(big.NewInt(state)),
+		})
+	}
+
+	actual, err := nodeInfosFromStackItems([]stackitem.Item{stackitem.NewArray(items)}, "")
+	require.NoError(t, err)
+	require.Equal(t, expected, actual)
+}