错误：在 azure devops 代理上为 Edge 浏览器运行 selenium 测试时，无法在 localhost:49756 上启动驱动程序服务

Question

我有一些用 C# 编写的自动化 selenium 测试，我正在尝试在 Microsoft Edge 浏览器的 CI（Azure DevOps）中启动它们。 我已经安装了 Edge WebDriver NuGet Package Selenium.WebDriver.MicrosoftWebDriver - Version 10.0.17134 ，它在bin\\Debug\\netcoreapp3.1文件夹中可用。 代理规格为vs2017-win2016 。 然而， Chrome和FireFox浏览器一切正常，测试运行顺利。

这是DriverBuilder类

public static class DriverBuilder
    {
        private static readonly string PathToDriverBinary =
            DirectoryHelper.TryGetSolutionDirectoryInfo() + @"\MyProject\bin\Debug\netcoreapp3.1";
        
        public static IWebDriver GetDriver()
        {
           
            var browser = ConfigManager.Browser;
            var options = DriverOptionsManager.GetDriverOptions();
            var wait = TimeSpan.FromSeconds(ConfigManager.Wait);

            switch (browser)
            {
                case BrowserType.Chrome:
                    var chromeDriver = new ChromeDriver(PathToDriverBinary, options as ChromeOptions);
                    chromeDriver.Manage().Timeouts().ImplicitWait = wait;
                    return chromeDriver;

                case BrowserType.Firefox:
                    var ffDriver = new FirefoxDriver(PathToDriverBinary, options as FirefoxOptions, TimeSpan.FromSeconds(150));
                    ffDriver.Manage().Timeouts().ImplicitWait = wait;
                    ffDriver.Manage().Window.Maximize();
                    return ffDriver;
                
                case BrowserType.MicrosoftEdge:
                    var microsoftEdgeDriver = new EdgeDriver(PathToDriverBinary, options as EdgeOptions, TimeSpan.FromSeconds(150));
                    microsoftEdgeDriver.Manage().Timeouts().ImplicitWait = wait;
                    microsoftEdgeDriver.Manage().Window.Maximize();
                    return microsoftEdgeDriver;

                default:
                    throw new Exception($"Driver type not found in configuration. Actual browser type: {browser}");
            }
        }
    }

这是DriverOptionsManager类：

public static class DriverOptionsManager
    {
        public static DriverOptions GetDriverOptions()
        {
            var options = ConfigManager.Browser switch
            {
                BrowserType.Chrome => (DriverOptions) ChromeOptions(),
                BrowserType.Firefox => FirefoxOptions(),
                BrowserType.MicrosoftEdge => EdgeOptions(),
                _ => throw new Exception("Browsers type chosen incorrect or not chosen")
            };

            return options;
        }

        private static ChromeOptions ChromeOptions()
        {
            var chromeOptions = new ChromeOptions();
            chromeOptions.AddUserProfilePreference("intl.accept_languages", "en-Gb");
            chromeOptions.BrowserVersion = "85.0";
            chromeOptions.AddArgument("--ignore-certificate-errors");
            chromeOptions.AddArgument("--start-maximized");
            chromeOptions.AddArgument("--enable-features=NetworkService,NetworkServiceInProcess");
            chromeOptions.AddAdditionalCapability("enableVNC", true, true);
            chromeOptions.AddAdditionalCapability("enableVideo", true, true);
            chromeOptions.AddAdditionalCapability("videoName", $"{TestContext.CurrentContext.Test.Name}.mp4", true);
            chromeOptions.AddAdditionalCapability("videoCodec", "mpeg4", true);
            return chromeOptions;
        }

        private static FirefoxOptions FirefoxOptions()
        {
            var firefoxOptions = new FirefoxOptions();
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
            firefoxOptions.AddAdditionalCapability("enableVNC", true, true);
            firefoxOptions.AddAdditionalCapability("enableVideo", true, true);
            firefoxOptions.AddAdditionalCapability("videoName", $"{TestContext.CurrentContext.Test.Name}.mp4", true);

            firefoxOptions.Profile = new FirefoxProfile();
            firefoxOptions.Profile.SetPreference("intl.accept_languages", "en-GB");
            return firefoxOptions;
        }
        private static EdgeOptions EdgeOptions()
        {
            var edgeOptions = new EdgeOptions();
            edgeOptions.AddAdditionalCapability("intl.accept_languages", "en-Gb");
            edgeOptions.PageLoadStrategy = PageLoadStrategy.None;
            return edgeOptions;
        }
    }

但是在 azure 代理上为 Edge Browser 运行 selenium 测试时，我不断收到以下错误：

2020-09-15T12:17:38.3233809Z No connection could be made because the target machine actively refused it. No connection could be made because the target machine actively refused it.
2020-09-15T12:17:38.3234893Z -> #14: error: Cannot start the driver service on http://localhost:49756/