rpc: refactor TestCalculateNetworkFee

We need to ensure that we don't add extra network fee during
calculation.

pkg/rpc/server/client_test.go

@@ -71,6 +71,7 @@ func TestAddNetworkFee(t *testing.T) {
 	defer chain.Close()
 	defer rpcSrv.Shutdown()
 	const extraFee = 10
+	var nonce uint32
 
 	c, err := client.New(context.Background(), httpSrv.URL, client.Options{})
 	require.NoError(t, err)
@@ -98,41 +99,105 @@ func TestAddNetworkFee(t *testing.T) {
 		require.Error(t, c.AddNetworkFee(tx, extraFee, accs[0], accs[1]))
 	})
 	t.Run("Simple", func(t *testing.T) {
+		acc0 := wallet.NewAccountFromPrivateKey(testchain.PrivateKeyByID(0))
+		check := func(t *testing.T, extraFee int64) {
 			tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0)
-		accs := getAccounts(t, 1)
+			tx.ValidUntilBlock = 20
 			tx.Signers = []transaction.Signer{{
-			Account: accs[0].PrivateKey().GetScriptHash(),
+				Account: acc0.PrivateKey().GetScriptHash(),
 				Scopes:  transaction.CalledByEntry,
 			}}
-		require.NoError(t, c.AddNetworkFee(tx, 10, accs[0]))
+			tx.Nonce = nonce
-		require.NoError(t, accs[0].SignTx(testchain.Network(), tx))
+			nonce++
-		cFee, _ := fee.Calculate(chain.GetBaseExecFee(), accs[0].Contract.Script)
+
-		require.Equal(t, int64(io.GetVarSize(tx))*feePerByte+cFee+extraFee, tx.NetworkFee)
+			require.NoError(t, c.AddNetworkFee(tx, extraFee, acc0))
+			actual := tx.NetworkFee
+
+			require.NoError(t, acc0.SignTx(testchain.Network(), tx))
+			cFee, _ := fee.Calculate(chain.GetBaseExecFee(), acc0.Contract.Script)
+			expected := int64(io.GetVarSize(tx))*feePerByte + cFee + extraFee
+
+			require.Equal(t, expected, actual)
+			err := chain.VerifyTx(tx)
+			if extraFee < 0 {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		}
+
+		t.Run("with extra fee", func(t *testing.T) {
+			// check that calculated network fee with extra value is enough
+			check(t, extraFee)
+		})
+		t.Run("without extra fee", func(t *testing.T) {
+			// check that calculated network fee without extra value is enough
+			check(t, 0)
+		})
+		t.Run("exactFee-1", func(t *testing.T) {
+			// check that we don't add unexpected extra GAS
+			check(t, -1)
+		})
 	})
 
 	t.Run("Multi", func(t *testing.T) {
+		acc0 := wallet.NewAccountFromPrivateKey(testchain.PrivateKeyByID(0))
+		acc1 := wallet.NewAccountFromPrivateKey(testchain.PrivateKeyByID(0))
+		acc1.ConvertMultisig(3, keys.PublicKeys{
+			testchain.PrivateKeyByID(0).PublicKey(),
+			testchain.PrivateKeyByID(1).PublicKey(),
+			testchain.PrivateKeyByID(2).PublicKey(),
+			testchain.PrivateKeyByID(3).PublicKey(),
+		})
+		check := func(t *testing.T, extraFee int64) {
 			tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0)
-		accs := getAccounts(t, 4)
+			tx.ValidUntilBlock = 20
-		pubs := keys.PublicKeys{accs[1].PrivateKey().PublicKey(), accs[2].PrivateKey().PublicKey(), accs[3].PrivateKey().PublicKey()}
-		require.NoError(t, accs[1].ConvertMultisig(2, pubs))
-		require.NoError(t, accs[2].ConvertMultisig(2, pubs))
 			tx.Signers = []transaction.Signer{
 				{
-				Account: accs[0].PrivateKey().GetScriptHash(),
+					Account: acc0.PrivateKey().GetScriptHash(),
 					Scopes:  transaction.CalledByEntry,
 				},
 				{
-				Account: hash.Hash160(accs[1].Contract.Script),
+					Account: hash.Hash160(acc1.Contract.Script),
 					Scopes:  transaction.Global,
 				},
 			}
-		require.NoError(t, c.AddNetworkFee(tx, extraFee, accs[0], accs[1]))
+			tx.Nonce = nonce
-		require.NoError(t, accs[0].SignTx(testchain.Network(), tx))
+			nonce++
-		require.NoError(t, accs[1].SignTx(testchain.Network(), tx))
+
-		require.NoError(t, accs[2].SignTx(testchain.Network(), tx))
+			require.NoError(t, c.AddNetworkFee(tx, extraFee, acc0, acc1))
-		cFee, _ := fee.Calculate(chain.GetBaseExecFee(), accs[0].Contract.Script)
+			actual := tx.NetworkFee
-		cFeeM, _ := fee.Calculate(chain.GetBaseExecFee(), accs[1].Contract.Script)
+
-		require.Equal(t, int64(io.GetVarSize(tx))*feePerByte+cFee+cFeeM+extraFee, tx.NetworkFee)
+			require.NoError(t, acc0.SignTx(testchain.Network(), tx))
+			tx.Scripts = append(tx.Scripts, transaction.Witness{
+				InvocationScript:   testchain.Sign(tx),
+				VerificationScript: acc1.Contract.Script,
+			})
+			cFee, _ := fee.Calculate(chain.GetBaseExecFee(), acc0.Contract.Script)
+			cFeeM, _ := fee.Calculate(chain.GetBaseExecFee(), acc1.Contract.Script)
+			expected := int64(io.GetVarSize(tx))*feePerByte + cFee + cFeeM + extraFee
+
+			require.Equal(t, expected, actual)
+			err := chain.VerifyTx(tx)
+			if extraFee < 0 {
+				require.Error(t, err)
+			} else {
+				require.NoError(t, err)
+			}
+		}
+
+		t.Run("with extra fee", func(t *testing.T) {
+			// check that calculated network fee with extra value is enough
+			check(t, extraFee)
+		})
+		t.Run("without extra fee", func(t *testing.T) {
+			// check that calculated network fee without extra value is enough
+			check(t, 0)
+		})
+		t.Run("exactFee-1", func(t *testing.T) {
+			// check that we don't add unexpected extra GAS
+			check(t, -1)
+		})
 	})
 	t.Run("Contract", func(t *testing.T) {
 		h, err := util.Uint160DecodeStringLE(verifyContractHash)
@@ -142,16 +207,16 @@ func TestAddNetworkFee(t *testing.T) {
 		acc1 := wallet.NewAccountFromPrivateKey(priv) // contract account
 		acc1.Contract.Deployed = true
 		acc1.Contract.Script, err = base64.StdEncoding.DecodeString(verifyContractAVM)
+		require.NoError(t, err)
 
 		newTx := func(t *testing.T) *transaction.Transaction {
 			tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0)
-			require.NoError(t, err)
 			tx.ValidUntilBlock = chain.BlockHeight() + 10
 			return tx
 		}
 
 		t.Run("Valid", func(t *testing.T) {
-			completeTx := func(t *testing.T) *transaction.Transaction {
+			check := func(t *testing.T, extraFee int64) {
 				tx := newTx(t)
 				tx.Signers = []transaction.Signer{
 					{
@@ -164,28 +229,28 @@ func TestAddNetworkFee(t *testing.T) {
 					},
 				}
 				require.NoError(t, c.AddNetworkFee(tx, extraFee, acc0, acc1))
-				return tx
+				require.NoError(t, acc0.SignTx(testchain.Network(), tx))
+				tx.Scripts = append(tx.Scripts, transaction.Witness{})
+				err = chain.VerifyTx(tx)
+				if extraFee < 0 {
+					require.Error(t, err)
+				} else {
+					require.NoError(t, err)
+				}
 			}
 
-			// check that network fee with extra value is enough
+			t.Run("with extra fee", func(t *testing.T) {
-			tx1 := completeTx(t)
+				// check that calculated network fee with extra value is enough
-			require.NoError(t, acc0.SignTx(testchain.Network(), tx1))
+				check(t, extraFee)
-			tx1.Scripts = append(tx1.Scripts, transaction.Witness{})
+			})
-			require.NoError(t, chain.VerifyTx(tx1))
+			t.Run("without extra fee", func(t *testing.T) {
-
+				// check that calculated network fee without extra value is enough
-			// check that network fee without extra value is enough
+				check(t, 0)
-			tx2 := completeTx(t)
+			})
-			tx2.NetworkFee -= extraFee
+			t.Run("exactFee-1", func(t *testing.T) {
-			require.NoError(t, acc0.SignTx(testchain.Network(), tx2))
-			tx2.Scripts = append(tx2.Scripts, transaction.Witness{})
-			require.NoError(t, chain.VerifyTx(tx2))
-
 				// check that we don't add unexpected extra GAS
-			tx3 := completeTx(t)
+				check(t, -1)
-			tx3.NetworkFee -= extraFee + 1
+			})
-			require.NoError(t, acc0.SignTx(testchain.Network(), tx3))
-			tx3.Scripts = append(tx3.Scripts, transaction.Witness{})
-			require.Error(t, chain.VerifyTx(tx3))
 		})
 		t.Run("Invalid", func(t *testing.T) {
 			tx := newTx(t)