fix

contrib/registry/nacos/registry_test.go

@@ -16,8 +16,9 @@ import (
 )
 
 func TestRegistry_Register(t *testing.T) {
-	out := exec.Command("lsof-i:8848").String()
+	exec := exec.Command("lsof-i:8848")
-	fmt.Println(out)
+	exec.Run()
+	fmt.Println(exec.String())
 	sc := []constant.ServerConfig{
 		*constant.NewServerConfig("127.0.0.1", 8848),
 	}