From ea977525df0ffa95b26901e73ba02d0decd65951 Mon Sep 17 00:00:00 2001
From: jsvisa <delweng@gmail.com>
Date: Wed, 24 Sep 2025 11:06:17 +0800
Subject: [PATCH] eth: add integration test

---
 eth/api_backend_test.go | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/eth/api_backend_test.go b/eth/api_backend_test.go
index d0718ede1c..aa0539511b 100644
--- a/eth/api_backend_test.go
+++ b/eth/api_backend_test.go
@@ -20,6 +20,7 @@ import (
 	"context"
 	"crypto/ecdsa"
 	"errors"
+	"math"
 	"math/big"
 	"testing"
 	"time"
@@ -130,6 +131,27 @@ func TestSendTx(t *testing.T) {
 	testSendTx(t, true)
 }
 
+func TestSendTxEIP2681(t *testing.T) {
+	b := initBackend(false)
+
+	// Test EIP-2681: nonce overflow should be rejected
+	tx := makeTx(uint64(math.MaxUint64), nil, nil, key) // max uint64 nonce
+	err := b.SendTx(context.Background(), tx)
+	if err == nil {
+		t.Fatal("Expected EIP-2681 nonce overflow error, but transaction was accepted")
+	}
+	if !errors.Is(err, core.ErrNonceMax) {
+		t.Errorf("Expected core.ErrNonceMax, got: %v", err)
+	}
+
+	// Test normal case: should succeed
+	normalTx := makeTx(0, nil, nil, key)
+	err = b.SendTx(context.Background(), normalTx)
+	if err != nil {
+		t.Errorf("Normal transaction should succeed, got error: %v", err)
+	}
+}
+
 func testSendTx(t *testing.T, withLocal bool) {
 	b := initBackend(withLocal)