public void TestExpiredNodes()
        {
            using (var loggerFactory = LoggerFactory.Create(builder => builder.SetMinimumLevel(LogLevel.Trace).AddFile("Logs/{Date}.txt", LogLevel.Trace)))
            {
                var l = loggerFactory.CreateLogger <LocalServiceTest>();
                var t = DateTime.Now;

                var ran    = new Random();
                int nport1 = ran.Next(1000, 10000);
                int nport2 = ran.Next(1000, 10000);

                l.LogInformation($"port 1 is {nport1}  port 2 is {nport2}");
                var inf1 = new HostPlatformInfo();
                using (var srv1 = new PCLocalService(inf1,
                                                     loggerFactory, Getfs(inf1.GetConfigFolder()), null))
                {
                    srv1.TestSetReannounceTime(1 * 1000);
                    srv1.TestSetUdpPort(nport1, new[] { nport2, nport1 });
                    srv1.StartService();
                    var pc1 = srv1.CreatePersonalCloud("test", "test1");
                    var ret = srv1.SharePersonalCloud(pc1);

                    Thread.Sleep(1000);

                    var inf2 = new HostPlatformInfo();
                    using (var srv2 = new PCLocalService(inf2,
                                                         loggerFactory, Getfs(inf2.GetConfigFolder()), null))
                    {
                        srv2.TestSetReannounceTime(1 * 1000);
                        srv2.TestSetUdpPort(nport2, new[] { nport2, nport1 });
                        l.LogInformation($"before srv2.StartService(),port {srv2.ServerPort}");
                        srv2.StartService();

                        //l.LogInformation((DateTime.Now - t).TotalSeconds.ToString());
                        Thread.Sleep(1000);
                        l.LogInformation("before srv2.JoinPersonalCloud();");
                        var pc2 = srv2.JoinPersonalCloud(int.Parse(ret, CultureInfo.InvariantCulture), "test2").Result;
                        srv1.StopSharePersonalCloud(pc1);
                        Thread.Sleep(2000);

                        SimpleShareCheckContent(pc2, 2, 2);
                        SimpleShareCheckContent(pc1, 2, 2);

                        srv2.Dispose();
                        l.LogInformation($"srv2 disposed");

                        Thread.Sleep(20000);
                        _ = pc1.RootFS.EnumerateChildrenAsync("/").AsTask().Result;
                        Thread.Sleep(3000);
                        SimpleShareCheckContent(pc1, 2, 1);
                    }
                }
            }
        }