[#233] Implement data audit result type with basic methods

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

v2/audit/marshal_test.go

@@ -0,0 +1,55 @@
+package audit_test
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/v2/audit"
+	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+	"github.com/stretchr/testify/require"
+)
+
+func TestDataAuditResult_StableMarshal(t *testing.T) {
+	from := generateDataAuditResult()
+
+	t.Run("non empty", func(t *testing.T) {
+		wire, err := from.StableMarshal(nil)
+		require.NoError(t, err)
+
+		to := new(audit.DataAuditResult)
+		require.NoError(t, to.Unmarshal(wire))
+
+		require.Equal(t, from, to)
+	})
+}
+
+func generateDataAuditResult() *audit.DataAuditResult {
+	a := new(audit.DataAuditResult)
+
+	oid1 := new(refs.ObjectID)
+	oid1.SetValue([]byte("Object ID 1"))
+
+	oid2 := new(refs.ObjectID)
+	oid2.SetValue([]byte("Object ID 2"))
+
+	cid := new(refs.ContainerID)
+	cid.SetValue([]byte("Container ID"))
+
+	a.SetAuditEpoch(13)
+	a.SetContainerID(cid)
+	a.SetPublicKey([]byte("Public key"))
+	a.SetPassSG([]*refs.ObjectID{oid1, oid2})
+	a.SetFailSG([]*refs.ObjectID{oid2, oid1})
+	a.SetHit(1)
+	a.SetMiss(2)
+	a.SetFail(3)
+	a.SetPassNodes([][]byte{
+		{1, 2},
+		{3, 4},
+	})
+	a.SetFailNodes([][]byte{
+		{5, 6},
+		{7, 8},
+	})
+
+	return a
+}