Selenium Grid (Advanced)

Selenium Grid distributes our tests across multiple machines so that we can run them in parallel, cutting down the time required for running tests.

The selenium-server-standalone package includes the Hub, WebDriver, and Selenium RC .

Setting up Hub: (Simple)

java -jar selenium-server-standalone-2.53.0.jar -port 4444 -role hub

Setting up Node:(Simple)

java -jar selenium-server-standalone-2.53.0.jar -role webdriver -hub http://xx.xx.xx.xx:4444/grid/register –port 8989

Setting up Node:(Complex)

If you want to setup a node with only IE browsers

Option1: via Command Text

java -jar selenium-server-standalone-2.53.0.jar -role webdriver -browser "browserName=internet explorer,version=11,maxinstance=1,platform=WINDOWS" -hub http://xx.xx.xx.xx:4444/grid/register –port 8989

Option2: via Json file

Save below Json as selenium-node-win-ie11-cfg.json

{

           "class": "org.openqa.grid.common.RegistrationRequest",

           "capabilities":

                              [

                                 { "seleniumProtocol": "WebDriver", 

                                    "browserName": "internet explorer",

                                    "version": "11",

                                    "maxInstances": 1,

                                    "platform" : "WINDOWS"

                                 }

                              ],

          "configuration":

                      {

                           "port": 8989,

                           "register": true,

                           "host": "xx.xx.xx.100", 

                           "proxy": "org.openqa.grid.selenium.proxy. DefaultRemoteProxy", 

                           "maxSession": 2,

                          "hubHost": "xx.xx.xx.100",

                          "role": "webdriver",

                          "registerCycle": 5000,

                          "hub": "http://xx.xx.xx.100:4444/grid/register",

                          "hubPort": 4444,

                          "remoteHost": "http://xx.xx.xx.101:8989"

                       }

}

one more json:

{
  "capabilities":
      [
        {
          "browserName": "chrome",
          "maxInstances": 5
        },
        {
          "browserName": "firefox",
          "maxInstances": 5
        },
        {
          "browserName": "internet explorer",
          "maxInstances": 5
        },
        {
          "browserName": "safari",
          "maxInstances": 5
        }
      ],
    "configuration":
        {
"_comment": "Configuration for Node",
        "nodeTimeout":120,
        "port":5555,
        "hubPort":4444,
        "hubHost":"hubIpAddress",
        "nodePolling":2000,
        "registerCycle":10000,
        "register":true,
        "cleanUpCycle":2000,
        "timeout":30000,
        "maxSession":5,
        }
}

Command Text:

java -jar selenium-server-standalone-53.jar -role webdriver -nodeConfig selenium-node-win-ie11-cfg.json

Selenium Remote WebDriver code:

DesiredCapabilities cap = new DesiredCapabilities();  

                                cap.setBrowserName("firefox");

                                cap.setPlatform(org.openqa.selenium.Platform.WINDOWS);

WebDriver driver = new RemoteWebDriver(new URL("http://xx.xx.xx.xx:4444/wd/hub"),cap);

Suite.xml:

<suite name="Parallel Tests" verbose="1" thread-count="4"

parallel="tests">

</suite>

thread-count=“4” describes the maximum number of threads to be executed in parallel.

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Each node contains  5 Chrome, 5 Firefox and 1 IE browser under Browser section like below.

Do you want only one IE browser?

java -jar selenium-server-standalone-2.41.0.jar -role webdriver -hub

http://localhost:4444/grid/register -port 5556 -browser browserName=iexplore

You want one browser per each type?

java -jar selenium-server-standalone-2.41.0.jar -role webdriver -hub

http://localhost:4444/grid/register -port 5556 -browser browserName=iexplore

-browser browserName=firefox -browser browserName=chrome

maxInstances:

maxInstance is used to limit the number of browser initialization in a node.

For example if you want to work with 2 Firefox and 2 IE then you can start the node using maxInstance.

java -jar selenium-server-standalone-2.41.0.jar -role webdriver -hub 

http://localhost:4444/grid/register -port 5556 -browser browserName=firefox,maxInstance=3

maxSession:

maxSession is used to configure how many number of browsers can be used parallel in the remote system.

java -jar selenium-server-standalone-2.41.0.jar -role webdriver -hub http://localhost:4444/grid/register -port 5556 -browser browserName=chrome,maxInstance=3 -browser browserName=firefox,maxInstance=3 –maxSession 3