accounting: implement SignedDataSource on BalanceRequest message

accounting/sign_test.go

@@ -0,0 +1,54 @@
+package accounting
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/service"
+	"github.com/nspcc-dev/neofs-crypto/test"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSignBalanceRequest(t *testing.T) {
+	// create test OwnerID
+	ownerID := OwnerID{1, 2, 3}
+
+	// create test BalanceRequest
+	req := new(BalanceRequest)
+	req.SetOwnerID(ownerID)
+
+	// create test private key
+	sk := test.DecodeKey(0)
+
+	items := []struct {
+		corrupt func()
+		restore func()
+	}{
+		{
+			corrupt: func() {
+				ownerID[0]++
+				req.SetOwnerID(ownerID)
+			},
+			restore: func() {
+				ownerID[0]--
+				req.SetOwnerID(ownerID)
+			},
+		},
+	}
+
+	for _, item := range items {
+		// sign with private key
+		require.NoError(t, service.AddSignatureWithKey(sk, req))
+
+		// ascertain that verification is passed
+		require.NoError(t, service.VerifyAccumulatedSignatures(req))
+
+		// corrupt the request
+		item.corrupt()
+
+		// ascertain that verification is failed
+		require.Error(t, service.VerifyAccumulatedSignatures(req))
+
+		// ascertain that request
+		item.restore()
+	}
+}