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首页 > 解决方案 > '拒绝连接！selenium 服务器是否已启动？\n' 同时针对 Selenium Grid 运行 Nightwatch.js 测试

selenium - '拒绝连接！selenium 服务器是否已启动？\n' 同时针对 Selenium Grid 运行 Nightwatch.js 测试

问题描述

我使用Nightwatch-Cucumber基于Nightwatch.js来自动化我的测试。现在我想使用 Selenium Grid 和一个 Selenium 集线器和几个 Selenium 节点来执行我的测试。

这些是我实际使用的当前依赖项：

  "devDependencies": {
    "chromedriver": "2.37.0",
    "cucumber": "3.0.2",
    "geckodriver": "1.11.0",
    "nightwatch": "0.9.19",
    "nightwatch-cucumber": "9.0.0",
    "selenium-server-standalone-jar": "3.9.1",
  },

这是我的nightwatch.conf.js：

const config = {
  globals_path: "globals.js",
  output_folder: "reports",
  custom_commands_path: "commands",
  // custom_assertions_path: 'assertions',
  live_output: false,
  page_objects_path: "pageobjects",
  disable_colors: false,
  selenium: {
    start_process: true,
    server_path: seleniumServer.path,
    host: "127.0.0.1",
    port: 4444
  },
  test_settings: {
    default: {
      launch_url: "http://mywebsite.com"
    },
    firefox_grid: {
      selenium_host: "127.0.0.1",
      selenium_port: 4444,
      desiredCapabilities: {
        browserName: "firefox"
      }
      selenium: {
        start_process: false
      }
    }
  }
};
module.exports = config;

所以，这些是我为实现一切而执行的步骤：

1. 在 localhost 上启动 Selenium Hub

java -jar selenium-server-standalone-3.9.1.jar -port 4444 -role hub

2. 在 localhost 上启动 Selenium 节点

java -jar selenium-server-standalone-3.9.1.jar -port 5555 -role node

3. 开始 Nightwatch 测试

./node_modules/.bin/nightwatch --env firefox_grid --tag=myCucumberTag

当前结果： 执行 Nightwatch 测试时出现错误，我不知道为什么。它看起来像这样：

{ Error: Unhandled "error" event. ([object Object])
    at ClientManager.emit (events.js:185:19)
    at Nightwatch.<anonymous> (/Users/GRme/projects/Aservo/DP/lcm2/testautomation/end2end-web-tests/node_modules/nightwatch/lib/runner/clientmanager.js:68:10)
    at Object.onceWrapper (events.js:316:30)
    at emitOne (events.js:115:13)
    at Nightwatch.emit (events.js:210:7)
    at HttpRequest.<anonymous> (/Users/GRme/projects/Aservo/DP/lcm2/testautomation/end2end-web-tests/node_modules/nightwatch/lib/index.js:501:10)
    at emitThree (events.js:135:13)
    at HttpRequest.emit (events.js:216:7)
    at IncomingMessage.<anonymous> (/Users/GRme/projects/Aservo/DP/lcm2/testautomation/end2end-web-tests/node_modules/nightwatch/lib/http/request.js:172:16)
    at emitNone (events.js:110:20)
    at IncomingMessage.emit (events.js:207:7)
    at endReadableNT (_stream_readable.js:1057:12)
    at _combinedTickCallback (internal/process/next_tick.js:138:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
  context:
   { message: 'Connection refused! Is selenium server started?\n',
     data: { value: [Object], status: 33 } } }

Nightwatch 对 Selenium 中心的请求似乎是成功的：

21:50:52.393 INFO - Got a request to create a new session: Capabilities {acceptSslCerts: true, browserName: chrome, javascriptEnabled: true}
21:50:52.399 INFO - Trying to create a new session on test slot {seleniumProtocol=WebDriver, se:CONFIG_UUID=037e48a7-b5bc-44f2-a25b-e85c752095a7, browserName=chrome, maxInstances=5, platformName=MAC, platform=MAC}

请求也被导航到 Selenium 节点：

2018-05-03 21:50:52.418:INFO:osjshC.ROOT:qtp1300393335-22: org.openqa.selenium.remote.server.WebDriverServlet-49d904ec: Initialising WebDriverServlet
21:50:52.450 INFO - Found handler: org.openqa.selenium.remote.server.commandhandler.BeginSession@31a65f95
21:50:52.454 INFO - /session: Executing POST on /session (handler: BeginSession)
21:50:52.546 INFO - Capabilities are: Capabilities {acceptSslCerts: true, browserName: chrome, javascriptEnabled: true}
21:50:52.548 INFO - Capabilities {acceptSslCerts: true, browserName: chrome, javascriptEnabled: true} matched class org.openqa.selenium.remote.server.ServicedSession$Factory (provider: org.openqa.selenium.chrome.ChromeDriverService)

那么，我做错了什么，我该如何解决？Nightwatch.js 和/或 Selenium Server 独立版本是否有问题？

标签： seleniumselenium-webdrivercucumberselenium-gridnightwatch.js

解决方案

此错误消息...

message: 'Connection refused!

...暗示Selenium Grid 节点无法启动/产生新的WebClient即Web 浏览会话。

您的主要问题在于用于启动/初始化Selenium Grid Node的命令。Selenium 网格节点应该以所需的WebDriver变体作为参数启动，如下所示：

  1. 启动Selenium Grid Hub（默认在 port 上4444）：

    java -jar selenium-server-standalone-3.9.1.jar -role hub

  2. 启动Selenium Grid 节点（默认在 port 上5555）：

    java -Dwebdriver.chrome.driver=C:/path/to/chromedriver.exe -jar selenium-server-standalone-3.9.1.jar -role node -hub http://localhost:4444/grid/register

您可以在拒绝连接中找到类似的详细讨论！硒服务器是否在边缘启动了守夜

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