System.InvalidOperationException:无法找到转发新会话的错误:Capabilities {browserName: chrome, marionette: false} [英] System.InvalidOperationException : Error forwarding the new session cannot find : Capabilities {browserName: chrome, marionette: false}

问题描述

我正在尝试使用 Grid 运行我的 Selenium C# 自动化测试.
当我运行测试时出现错误:

I am trying to run my Selenium C# automated test using Grid.
When i run the test I get the error:

Message: System.InvalidOperationException : Error forwarding the new session cannot find : Capabilities {browserName: chrome, marionette: false, platform: WINDOWS}

我在以下目录中有 chromedriver.exe:

F:\Selenium Projects\C#\Grid practice\automation\

我已将环境变量的路径从系统、控制面板设置为路径:

I have set the path for Environment Variables from System, Control Panel to the path:

F:\Selenium Projects\C#\Grid practice\automation\

我的代码片段是:

My code snippet is:

public class Browsers : DriverClass
{
    public IWebDriver LaunchBrowser(string browser)
    {
        switch (browser)
        {
            case "chrome":
                GoToChromeBrowser("chrome");
                break;

            case "firefox":
                GoToFirefoxBrowser();
                break;

            case "ie":
                GoToIeBrowser();
                break;

            case "edge":
                GoToEdgeBrowser();
                break;

            case "remote":
                GoToRemoteBrowser();
                break;
            default:
                throw new Exception("did not find browser type selected");
        }
        return Driver;
    }
}

方法GoToChromeBrowser():

public void GoToChromeBrowser(string BrowserType)
{
    switch (BrowserType)
    {
        case "firefox":
            Driver = new FirefoxDriver();
            break;
        case "chrome":
            DesiredCapabilities cap = new DesiredCapabilities();
            cap.SetCapability(CapabilityType.BrowserName, "chrome");
            cap.SetCapability("marionette", false);
            cap.SetCapability(CapabilityType.Platform, new Platform(PlatformType.Windows));
            Driver = new RemoteWebDriver(new Uri("http://localhost:4444/wd/hub"), cap);
            break;                    
    }
}

要启动集线器，我使用 CMD 中的命令:

To start the Hub I use the command in CMD:

java -jar F:\Selenium\Server\selenium-server-standalone-3.11.0.jar -role hub

要注册节点，我使用以下命令:

To register the node I use the command:

java -jar selenium-server-standalone-3.11.0.jar -role node -hub http://localhost:4444/grid/register -browser "browserName=chrome version=ANY, maxInstances=5, platform=WINDOWS" -port 5566 

集线器已正常启动并且节点已注册.没有错误.
为什么我在 Visual Studio 中运行测试时会收到错误消息?
我错过了什么或做错了什么?

The hub has started fine and the node is registered. No errors there.
Why am I getting the error when I run my test in Visual Studio?
What am i missing or doing wrong?

推荐答案

此错误信息...

selenium.common.exceptions.WebDriverException: Message: unknown error: Chrome failed to start: exited abnormally

...表示 ChromeDriver 无法启动/生成新的 WebClient，即 Chrome 浏览器 会话.

...implies that the ChromeDriver was unable to initiate/spawn a new WebClient i.e. Chrome Browser session.

您的主要问题是 ChromeDriver 存在未定义的功能，如下所示:

Your main issue is the presence of undefined capability for ChromeDriver as follows :

• 您已使用 "marionette", false 调用了 SetCapability()，但 ChromeDriver 不支持任何此类功能，例如 牵线木偶.
• ma​​rionette 功能由 GeckoDriver 使用，当您使用 selenium-server-standalone-3.11.0.jar 时，您必须强制使用 GeckoDriver，默认情况下将 marionette 设置为 true.如果您将marionette 强行设置为false，GeckoDriver 将抛出一个异常.

• 正如@NareshChaurasia 指出的，当您启动 Selenium Hub 节点 时，您必须按如下方式传递 ChromeDriver 的绝对路径:

• You have invoked SetCapability() with "marionette", false, but ChromeDriver doesn't supports any such capability as marionette.
• The capability marionette is used by GeckoDriver and as you are using selenium-server-standalone-3.11.0.jar you have to mandatorily use GeckoDriver which by default sets marionette as true. If you forcefully set marionette as false, GeckoDriver will throw an exception.

• As @NareshChaurasia pointed out while you initiate the Selenium Hub Node you have to pass the absolute path of the ChromeDriver as follows :

java -Dwebdriver.chrome.driver=F:/Selenium Projects/C#/Grid practice/automation/chromedriver.exe -jar selenium-server-standalone-3.11.0.jar -role node -hub http://192.168.0.100:4444/grid/register

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