使用 Firefox 从 Nightwatch.js 自动运行 Selenium 时出错

Question

我想在运行 nightwatch.js 测试用例时自动启动 Selenium Server。我将 nightwatch.json 上的 selenium 设置更改为：

  "selenium" : {
    "start_process" : true,
    "server_path" : "./selenium/selenium391.jar",
    "log_path" : "C:/Projects/reports",
    "host" : "127.0.0.1",
    "port" : 4444,
    "cli_args" : {
      "webdriver.chrome.driver" : "./selenium/chromedriver.exe",
      "webdriver.ie.driver" : "./selenium/IEDriverServer.exe",
      "webdriver.firefox.profile" : "./selenium/geckodriver.exe"
    }
  },

当我使用 Chrome 作为浏览器时，此配置有效。但是，当我使用 Firefox 运行它时出现错误：

ERROR Response 500 POST /wd/hub/session (312ms) { value:
   { message: 'Unable to create new service: GeckoDriverService\nBuild info: ver
sion: \'3.9.1\', revision: \'63f7b50\', time: \'2018-02-07T22:42:28.403Z\'\nSyst
em info: host: \'IBS-PC192\', ip: \'192.168.1.115\', os.name: \'Windows 7\', os.
arch: \'x86\', os.version: \'6.1\', java.version: \'1.8.0_112\'\nDriver info: dr
iver.version: unknown',
     error: 'session not created' },
  status: 33 }

如果我手动运行 Selenium 服务器，nightwatch 测试可以在 Firefox 上运行。我该如何解决这个问题？

nightwatch.json 文件： 用于 Firefox

{
  "src_folders" : ["tests"],
  "output_folder" : "reports",
  "custom_commands_path" : "",
  "page_objects_path" : "",
  "custom_assertions_path" : "",
  "globals_path" : "C:/Projects/global/globals.js",
  "live_output" : false,
  "parallel_process_delay" : 10,
  "disable_colors": false,
  "test_workers" : false,

  "selenium" : {
    "start_process" : true,
    "server_path" : "./selenium/selenium391.jar",
    "log_path" : "C:/Projects/reports",
    "host" : "127.0.0.1",
    "port" : 4444,
    "cli_args" : {
      "webdriver.chrome.driver" : "./selenium/chromedriver.exe",
      "webdriver.ie.driver" : "./selenium/IEDriverServer.exe",
      "webdriver.firefox.profile" : "./selenium/geckodriver.exe"
    }
  },

  "test_settings" : {
    "default" : {
      "launch_url" : "http://localhost",
      "selenium_host" : "127.0.0.1",
      "selenium_port" : 4444,
      "silent" : true,
      "disable_colors": false,
      "screenshots" : {
        "enabled" : false,
        "path" : ""
      },
      "desiredCapabilities" : {
        "browserName" : "firefox",
        "javascriptEnabled" : true,
        "acceptSslCerts" : true
      }
    },

selenium-debug.log 的内容

14:24:00.791 INFO - Selenium build info: version: '3.9.1', revision: '63f7b50'
14:24:00.791 INFO - Launching a standalone Selenium Server on port 4444
2018-02-16 14:24:00.853:INFO::main: Logging initialized @280ms to org.seleniumhq.jetty9.util.log.StdErrLog
2018-02-16 14:24:00.962:INFO:osjs.Server:main: jetty-9.4.7.v20170914, build timestamp: 2017-11-21T22:27:37+01:00, git hash: 82b8fb23f757335bb3329d540ce37a2a2615f0a8
2018-02-16 14:24:00.978:WARN:osjs.SecurityHandler:main: ServletContext@o.s.j.s.ServletContextHandler@5ed7a6{/,null,STARTING} has uncovered http methods for path: /
2018-02-16 14:24:00.978:INFO:osjsh.ContextHandler:main: Started o.s.j.s.ServletContextHandler@5ed7a6{/,null,AVAILABLE}
2018-02-16 14:24:01.352:INFO:osjs.AbstractConnector:main: Started ServerConnector@18f65a4{HTTP/1.1,[http/1.1]}{0.0.0.0:4444}
2018-02-16 14:24:01.352:INFO:osjs.Server:main: Started @782ms
14:24:01.352 INFO - Selenium Server is up and running on port 4444
2018-02-16 14:24:01.540:INFO:osjshC.ROOT:qtp17048053-10: org.openqa.selenium.remote.server.WebDriverServlet-132ec19: Initialising WebDriverServlet
14:24:01.618 INFO - Found handler: org.openqa.selenium.remote.server.commandhandler.BeginSession@1e1a802
14:24:01.618 INFO - /session: Executing POST on /session (handler: BeginSession)
14:24:01.680 INFO - Capabilities are: Capabilities {acceptSslCerts: true, browserName: firefox, javascriptEnabled: true, name: Google Wiki}
14:24:01.680 INFO - Capabilities {acceptSslCerts: true, browserName: firefox, javascriptEnabled: true, name: Google Wiki} matched class org.openqa.selenium.remote.server.ServicedSession$Factory (provider: org.openqa.selenium.firefox.GeckoDriverService)

Answer 1

您看到的错误确实为我们提供了一些关于出错的提示，如下所示：

ERROR Response 500 POST /wd/hub/session (312ms) { value: { message: 'Unable to create new service: GeckoDriverService\nBuild info: version: \'3.9.1\', revision: \'63f7b50\', time: \'2018-02-07T22:42:28.403Z\'\nSystem info: host: \'IBS-PC192\', ip: \'192.168.1.115\', os.name: \'Windows 7\', os.arch: \'x86\', os.version: \'6.1\', java.version: \'1.8.0_112\'\nDriver info: driver.version: unknown', error: 'session not created' }, status: 33 }

超文本传输​​协议 (HTTP) Response 500 服务器错误响应代码表明服务器遇到了阻止其完成请求的意外情况。

主要原因是您使用的 二进制文件 不兼容：

• Selenium Client 版本为 selenium391.jar 发布 '2018-02-07T22:42:28.403Z'
• 但是 JDK 版本是 java.version: '1.8.0_112，这很古老。

解决方案

一个快速的解决方案是：

• 将 JDK 版本更新到最新级别，即Java SE Development Kit 8u161
• 运行CCleaner 工具在执行您的测试套件之前和之后清除操作系统的琐事

---

更新

正如您在评论中提到的，您仍然遇到同样的错误，您需要更改以下行：

"webdriver.firefox.profile" : "./selenium/geckodriver.exe"

收件人：

"webdriver.gecko.driver" : "./selenium/geckodriver.exe"