Selenium Grid WebDriver 无法创建新的远程会话所需的功能

Question

我正在试用 Selenium Grid。我的测试是用 Selenium Python 编写的。 我已经在我的本地机器上启动了 Grid 集线器，我已经在同一台机器上使用 json 文件为 IE 注册了节点。 我运行 selenium 样本测试，我收到以下错误：

Unable to create new remote session desired capabilities

完整的错误跟踪：

    Traceback (most recent call last):
  File "E:\RL Fusion\projects\Selenium Grid\Selenium Grid Sample\Test1 working - try json config file 2\Test1.py", line 21, in setUp
    desired_capabilities=desired_cap)
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 89, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 138, in start_session
    'desiredCapabilities': desired_capabilities,
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 195, in execute
    self.error_handler.check_response(response)
  File "C:\Python27\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 170, in check_response
    raise exception_class(message, screen, stacktrace)
WebDriverException: Message: Unable to create new remote session. desired capabilities = Capabilities [{browserName=internet explorer, javascriptEnabled=true, platform=WINDOWS}], required capabilities = null
Build info: version: '3.0.0-beta3', revision: 'c7b525d', time: '2016-09-01 14:57:03 -0700'
System info: host: 'OptimusPrime-PC', ip: '192.168.0.2', os.name: 'Windows 8.1', os.arch: 'x86', os.version: '6.3', java.version: '1.8.0_31'
Driver info: driver.version: InternetExplorerDriver
Stacktrace:
    at org.openqa.selenium.remote.ProtocolHandshake.createSession (ProtocolHandshake.java:80)
    at org.openqa.selenium.remote.HttpCommandExecutor.execute (HttpCommandExecutor.java:141)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute (DriverCommandExecutor.java:82)
    at org.openqa.selenium.remote.RemoteWebDriver.execute (RemoteWebDriver.java:597)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession (RemoteWebDriver.java:242)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession (RemoteWebDriver.java:228)
    at org.openqa.selenium.ie.InternetExplorerDriver.run (InternetExplorerDriver.java:180)
    at org.openqa.selenium.ie.InternetExplorerDriver.<init> (InternetExplorerDriver.java:172)
    at org.openqa.selenium.ie.InternetExplorerDriver.<init> (InternetExplorerDriver.java:148)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0 (None:-2)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance (None:-1)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance (None:-1)
    at java.lang.reflect.Constructor.newInstance (None:-1)
    at org.openqa.selenium.remote.server.DefaultDriverProvider.callConstructor (DefaultDriverProvider.java:103)
    at org.openqa.selenium.remote.server.DefaultDriverProvider.newInstance (DefaultDriverProvider.java:97)
    at org.openqa.selenium.remote.server.DefaultDriverFactory.newInstance (DefaultDriverFactory.java:60)
    at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call (DefaultSession.java:222)
    at org.openqa.selenium.remote.server.DefaultSession$BrowserCreator.call (DefaultSession.java:209)
    at java.util.concurrent.FutureTask.run (None:-1)
    at org.openqa.selenium.remote.server.DefaultSession$1.run (DefaultSession.java:176)
    at java.util.concurrent.ThreadPoolExecutor.runWorker (None:-1)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run (None:-1)
    at java.lang.Thread.run (None:-1)

json.cfg.json 配置实现：

    {
  "class": "org.openqa.grid.common.RegistrationRequest",
  "capabilities": [
    {
      "seleniumProtocol": "WebDriver",
      "browserName": "internet explorer",
      "version": "11",
      "maxInstances": 1,
      "platform" : "WIN7"   }
    ],
    "configuration" : {
      "port": 5555,
      "register": true,
      "host": "192.168.0.6",
      "proxy": "org.openqa.grid.selenium.proxy.   DefaultRemoteProxy",
      "maxSession": 2,
      "hubHost": "192.168.0.6",
      "role": "webdriver",
      "registerCycle": 5000,
      "hub": "http://192.168.0.6:4444/grid/register",
      "hubPort": 4444,
      "remoteHost": "http://localhost:4444"
    }
}

我的 Selenium Python 文件中的设置方法是：

def setUp(self):
        desired_cap = {'browserName': 'internet explorer',
        #'platform': 'WIN8_1',
        'platform': 'WIN7',
        'javascriptEnabled': True}


    self.driver = webdriver.Remote(
        command_executor='http://localhost:4444/wd/hub',
        desired_capabilities=desired_cap)

我做错了什么？我想要的功能配置不正确吗？ 我在完整的跟踪日志中注意到它说 Win 8.1
我已经提到了平台的Win7。我不知道它为什么要尝试 Win 8.1

我现在已将所需功能更改为以下内容：

desired_cap = {'browserName': 'internet explorer',
        'platform': 'windows',
        'javascriptEnabled': True,
'InternetExplorerDriver.INTRODUCE_FLAKINESS_BY_IGNORING_SECURITY_DOMAINS': True
}

我现在得到错误：

WebDriverException: Message: Error forwarding the new session cannot find : Capabilities [{browserName=internet explorer, InternetExplorerDriver.INTRODUCE_FLAKINESS_BY_IGNORING_SECURITY_DOMAINS=true, javascriptEnabled=true, platform=XP}]

我需要一些帮助。 谢谢，里亚兹

Answer 1

Grid 在其DefaultCapabilitiesMatcher 中使用以下三个属性来决定应该将新会话请求路由到哪个节点：

1. Platform
2. BrowserType
3. 浏览器版本

在您的情况下，根据您所做的更改，您的测试要求一个在 Windows 上运行 IE 的节点，但在您的 nodeConfig.json 中，您基本上指定了“WIN7”。

我不认为指定“WINDOWS”对你有用。您可以尝试更改您想要的功能以引用 WIN7，这应该可以工作。

Answer 2

只需将 IE 的安全设置保持在中间（中到高），并为所有人启用保护模式。

然后问题就解决了。