diff --git a/internal/firewalls/nftables/conn_test.go b/internal/firewalls/nftables/conn_test.go
index 8840210..44d2ac8 100644
--- a/internal/firewalls/nftables/conn_test.go
+++ b/internal/firewalls/nftables/conn_test.go
@@ -7,7 +7,6 @@ package nftables_test
 import (
 	"github.com/TeaOSLab/EdgeNode/internal/firewalls/nftables"
 	executils "github.com/TeaOSLab/EdgeNode/internal/utils/exec"
-	"os/exec"
 	"testing"
 )
 
@@ -21,7 +20,10 @@ func TestConn_Test(t *testing.T) {
 }
 
 func TestConn_GetTable_NotFound(t *testing.T) {
-	var conn = nftables.NewConn()
+	conn, err := nftables.NewConn()
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	table, err := conn.GetTable("a", nftables.TableFamilyIPv4)
 	if err != nil {
@@ -36,7 +38,10 @@ func TestConn_GetTable_NotFound(t *testing.T) {
 }
 
 func TestConn_GetTable(t *testing.T) {
-	var conn = nftables.NewConn()
+	conn, err := nftables.NewConn()
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	table, err := conn.GetTable("myFilter", nftables.TableFamilyIPv4)
 	if err != nil {
@@ -51,7 +56,10 @@ func TestConn_GetTable(t *testing.T) {
 }
 
 func TestConn_AddTable(t *testing.T) {
-	var conn = nftables.NewConn()
+	conn, err := nftables.NewConn()
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	{
 		table, err := conn.AddIPv4Table("test_ipv4")
@@ -70,8 +78,12 @@ func TestConn_AddTable(t *testing.T) {
 }
 
 func TestConn_DeleteTable(t *testing.T) {
-	var conn = nftables.NewConn()
-	err := conn.DeleteTable("test_ipv4", nftables.TableFamilyIPv4)
+	conn, err := nftables.NewConn()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = conn.DeleteTable("test_ipv4", nftables.TableFamilyIPv4)
 	if err != nil {
 		t.Fatal(err)
 	}