internal/ethapi: add tests for transaction types JSON marshal/unmarshal (#26667)

Checks that Transaction.MarshalJSON and newRPCTransaction JSON output can be parsed by Transaction.UnmarshalJSON

---------
Co-authored-by: Martin Holst Swende <martin@swende.se>

internal/ethapi/api_test.go

+// Copyright 2023 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package ethapi
+
+import (
+	"encoding/json"
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+func TestTransaction_RoundTripRpcJSON(t *testing.T) {
+	var (
+		config = params.AllEthashProtocolChanges
+		signer = types.LatestSigner(config)
+		key, _ = crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
+		tests  = allTransactionTypes(common.Address{0xde, 0xad}, config)
+	)
+	t.Parallel()
+	for i, tt := range tests {
+		var tx2 types.Transaction
+		tx, err := types.SignNewTx(key, signer, tt)
+		if err != nil {
+			t.Fatalf("test %d: signing failed: %v", i, err)
+		}
+		// Regular transaction
+		if data, err := json.Marshal(tx); err != nil {
+			t.Fatalf("test %d: marshalling failed; %v", i, err)
+		} else if err = tx2.UnmarshalJSON(data); err != nil {
+			t.Fatalf("test %d: sunmarshal failed: %v", i, err)
+		} else if want, have := tx.Hash(), tx2.Hash(); want != have {
+			t.Fatalf("test %d: stx changed, want %x have %x", i, want, have)
+		}
+
+		//  rpcTransaction
+		rpcTx := newRPCTransaction(tx, common.Hash{}, 0, 0, nil, config)
+		if data, err := json.Marshal(rpcTx); err != nil {
+			t.Fatalf("test %d: marshalling failed; %v", i, err)
+		} else if err = tx2.UnmarshalJSON(data); err != nil {
+			t.Fatalf("test %d: unmarshal failed: %v", i, err)
+		} else if want, have := tx.Hash(), tx2.Hash(); want != have {
+			t.Fatalf("test %d: tx changed, want %x have %x", i, want, have)
+		}
+	}
+}
+
+func allTransactionTypes(addr common.Address, config *params.ChainConfig) []types.TxData {
+	return []types.TxData{
+		&types.LegacyTx{
+			Nonce:    5,
+			GasPrice: big.NewInt(6),
+			Gas:      7,
+			To:       &addr,
+			Value:    big.NewInt(8),
+			Data:     []byte{0, 1, 2, 3, 4},
+			V:        big.NewInt(9),
+			R:        big.NewInt(10),
+			S:        big.NewInt(11),
+		},
+		&types.LegacyTx{
+			Nonce:    5,
+			GasPrice: big.NewInt(6),
+			Gas:      7,
+			To:       nil,
+			Value:    big.NewInt(8),
+			Data:     []byte{0, 1, 2, 3, 4},
+			V:        big.NewInt(32),
+			R:        big.NewInt(10),
+			S:        big.NewInt(11),
+		},
+		&types.AccessListTx{
+			ChainID:  config.ChainID,
+			Nonce:    5,
+			GasPrice: big.NewInt(6),
+			Gas:      7,
+			To:       &addr,
+			Value:    big.NewInt(8),
+			Data:     []byte{0, 1, 2, 3, 4},
+			AccessList: types.AccessList{
+				types.AccessTuple{
+					Address:     common.Address{0x2},
+					StorageKeys: []common.Hash{types.EmptyRootHash},
+				},
+			},
+			V: big.NewInt(32),
+			R: big.NewInt(10),
+			S: big.NewInt(11),
+		},
+		&types.AccessListTx{
+			ChainID:  config.ChainID,
+			Nonce:    5,
+			GasPrice: big.NewInt(6),
+			Gas:      7,
+			To:       nil,
+			Value:    big.NewInt(8),
+			Data:     []byte{0, 1, 2, 3, 4},
+			AccessList: types.AccessList{
+				types.AccessTuple{
+					Address:     common.Address{0x2},
+					StorageKeys: []common.Hash{types.EmptyRootHash},
+				},
+			},
+			V: big.NewInt(32),
+			R: big.NewInt(10),
+			S: big.NewInt(11),
+		},
+		&types.DynamicFeeTx{
+			ChainID:   config.ChainID,
+			Nonce:     5,
+			GasTipCap: big.NewInt(6),
+			GasFeeCap: big.NewInt(9),
+			Gas:       7,
+			To:        &addr,
+			Value:     big.NewInt(8),
+			Data:      []byte{0, 1, 2, 3, 4},
+			AccessList: types.AccessList{
+				types.AccessTuple{
+					Address:     common.Address{0x2},
+					StorageKeys: []common.Hash{types.EmptyRootHash},
+				},
+			},
+			V: big.NewInt(32),
+			R: big.NewInt(10),
+			S: big.NewInt(11),
+		},
+		&types.DynamicFeeTx{
+			ChainID:    config.ChainID,
+			Nonce:      5,
+			GasTipCap:  big.NewInt(6),
+			GasFeeCap:  big.NewInt(9),
+			Gas:        7,
+			To:         nil,
+			Value:      big.NewInt(8),
+			Data:       []byte{0, 1, 2, 3, 4},
+			AccessList: types.AccessList{},
+			V:          big.NewInt(32),
+			R:          big.NewInt(10),
+			S:          big.NewInt(11),
+		},
+	}
+}