PlatformRunnerConfiguration.TryToGetFreePort C# (CSharp) Method

    public static int TryToGetFreePort()
    {
        var port = -1;
        try
        {
            var l = new TcpListener(IPAddress.Any, 0);
            l.Start();
            port = ((IPEndPoint)l.Server.LocalEndPoint).Port;
            l.Stop();
        }
        catch (SocketException e)
        {
            Debug.LogException(e);
        }
        return port;
    }
}

        private static void RunInEditor(List <string> testScenes, List <string> otherBuildScenes)
        {
            CheckActiveBuildTarget();

            NetworkResultsReceiver.StopReceiver();
            if (testScenes == null || testScenes.Count == 0)
            {
                Debug.Log("No test scenes on the list");
                EditorApplication.Exit(returnCodeRunError);
                return;
            }

            string previousScenesXml = "";
            var    serializer        = new System.Xml.Serialization.XmlSerializer(typeof(EditorBuildSettingsScene[]));

            using (StringWriter textWriter = new StringWriter())
            {
                serializer.Serialize(textWriter, EditorBuildSettings.scenes);
                previousScenesXml = textWriter.ToString();
            }

            EditorBuildSettings.scenes = (testScenes.Concat(otherBuildScenes).ToList()).Select(s => new EditorBuildSettingsScene(s, true)).ToArray();
            EditorSceneManager.OpenScene(testScenes.First());
            GuiHelper.SetConsoleErrorPause(false);

            var config = new PlatformRunnerConfiguration
            {
                resultsDir  = GetParameterArgument(k_ResultFileDirParam),
                ipList      = TestRunnerConfigurator.GetAvailableNetworkIPs(),
                port        = PlatformRunnerConfiguration.TryToGetFreePort(),
                runInEditor = true
            };

            var settings = new PlayerSettingConfigurator(true);

            settings.AddConfigurationFile(TestRunnerConfigurator.integrationTestsNetwork, string.Join("\n", config.GetConnectionIPs()));
            settings.AddConfigurationFile(TestRunnerConfigurator.testScenesToRun, string.Join("\n", testScenes.ToArray()));
            settings.AddConfigurationFile(TestRunnerConfigurator.previousScenes, previousScenesXml);

            NetworkResultsReceiver.StartReceiver(config);

            EditorApplication.isPlaying = true;
        }