[#64] object: move package from neofs-api-go

Also, remove deprecated method.

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

object/range_test.go

@@ -0,0 +1,58 @@
+package object
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/object"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRange_SetOffset(t *testing.T) {
+	r := NewRange()
+
+	off := uint64(13)
+	r.SetOffset(off)
+
+	require.Equal(t, off, r.GetOffset())
+}
+
+func TestRange_SetLength(t *testing.T) {
+	r := NewRange()
+
+	ln := uint64(7)
+	r.SetLength(ln)
+
+	require.Equal(t, ln, r.GetLength())
+}
+
+func TestNewRangeFromV2(t *testing.T) {
+	t.Run("from nil", func(t *testing.T) {
+		var x *object.Range
+
+		require.Nil(t, NewRangeFromV2(x))
+	})
+}
+
+func TestRange_ToV2(t *testing.T) {
+	t.Run("nil", func(t *testing.T) {
+		var x *Range
+
+		require.Nil(t, x.ToV2())
+	})
+}
+
+func TestNewRange(t *testing.T) {
+	t.Run("default values", func(t *testing.T) {
+		r := NewRange()
+
+		// check initial values
+		require.Zero(t, r.GetLength())
+		require.Zero(t, r.GetOffset())
+
+		// convert to v2 message
+		rV2 := r.ToV2()
+
+		require.Zero(t, rV2.GetLength())
+		require.Zero(t, rV2.GetOffset())
+	})
+}