From a199748899978ef5755ef7d37d5fe26d3ca3acff Mon Sep 17 00:00:00 2001
From: jsvisa <delweng@gmail.com>
Date: Wed, 24 Sep 2025 10:49:34 +0800
Subject: [PATCH] core/txpool: add test case

---
 core/txpool/validation_test.go | 115 +++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 core/txpool/validation_test.go

diff --git a/core/txpool/validation_test.go b/core/txpool/validation_test.go
new file mode 100644
index 0000000000..3945b548c1
--- /dev/null
+++ b/core/txpool/validation_test.go
@@ -0,0 +1,115 @@
+// Copyright 2025 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 txpool
+
+import (
+	"crypto/ecdsa"
+	"errors"
+	"math"
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/params"
+)
+
+func TestValidateTransactionEIP2681(t *testing.T) {
+	key, err := crypto.GenerateKey()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	head := &types.Header{
+		Number:     big.NewInt(1),
+		GasLimit:   5000000,
+		Time:       1,
+		Difficulty: big.NewInt(1),
+	}
+
+	signer := types.LatestSigner(params.TestChainConfig)
+
+	// Create validation options
+	opts := &ValidationOptions{
+		Config:       params.TestChainConfig,
+		Accept:       0xFF, // Accept all transaction types
+		MaxSize:      32 * 1024,
+		MaxBlobCount: 6,
+		MinTip:       big.NewInt(0),
+	}
+
+	tests := []struct {
+		name    string
+		nonce   uint64
+		wantErr error
+	}{
+		{
+			name:    "normal nonce",
+			nonce:   42,
+			wantErr: nil,
+		},
+		{
+			name:    "max allowed nonce (2^64-2)",
+			nonce:   math.MaxUint64 - 1,
+			wantErr: nil,
+		},
+		{
+			name:    "EIP-2681 nonce overflow (2^64-1)",
+			nonce:   math.MaxUint64,
+			wantErr: core.ErrNonceMax,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tx := createTestTransaction(key, tt.nonce)
+			err := ValidateTransaction(tx, head, signer, opts)
+
+			if tt.wantErr == nil {
+				if err != nil {
+					t.Errorf("ValidateTransaction() error = %v, wantErr nil", err)
+				}
+			} else {
+				if err == nil {
+					t.Errorf("ValidateTransaction() error = nil, wantErr %v", tt.wantErr)
+				} else if !errors.Is(err, tt.wantErr) {
+					t.Errorf("ValidateTransaction() error = %v, wantErr %v", err, tt.wantErr)
+				}
+			}
+		})
+	}
+}
+
+// createTestTransaction creates a basic transaction for testing
+func createTestTransaction(key *ecdsa.PrivateKey, nonce uint64) *types.Transaction {
+	to := common.HexToAddress("0x0000000000000000000000000000000000000001")
+
+	txdata := &types.LegacyTx{
+		Nonce:    nonce,
+		To:       &to,
+		Value:    big.NewInt(1000),
+		Gas:      21000,
+		GasPrice: big.NewInt(1),
+		Data:     nil,
+	}
+
+	tx := types.NewTx(txdata)
+	signedTx, _ := types.SignTx(tx, types.HomesteadSigner{}, key)
+	return signedTx
+}