Selenium Grid Tutorial: Writing first script for Grid using RemoteWebDriver

In previous posts, We have seen how to set up hub and nodes. But still we have not seen how to run your code on some remote machines.But code execution on remote machine could not be possible without RemoteWebDriver. But before moving ahead we need to cast our focus on this RemoteWebDriver.

\  This is implementation class of WebDriver interface which is plays a key role in script execution on some remote machine.RemoteWebDriver is divided in two parts
1- RemoteWebDriver Server
2- RemoteWebDriver Client

RemoteWebDriver Server : This part listen all the request on certain port from all the RemoteWebdriver client and on the basis of these request it approach Firefox, Chrome or IR driver to fulfill client request. So here when we run this command

we try to start the remote server.

RemoteWebDriver Client :  All the language binding works as RemoteWebDriver client which comes in to action when we try to execute any script. These client first try to translate all the information related to code execution in JSON formate and send it to remoteWebdriver server using JSON wire protocol and then server talks to all the drivers available as per the request.

So now you are familiar with the concept of RemoteWebDriver but how it servers your purpose.
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As you have already seen that RemoteWebDriver is implementation class of WebDriver and in your Selenium WebDriver script you always create a driver instance that talk to respective browser as per our code. In the same fashion you need to create instance of WebDriver like this

where URL is nothing but the it is URL of Hub that we have used in previous post like
Selenium Grid Commandso here URL would be (as per above image)
Capabilities is nothing but used to provide information about the configuration which contains type of browser, version and also provide information about platform where script should be executed remotely.So lets see how to it is being used , Suppose you want to execute your code on firefox with version 40.0 and want to run this test on node machine which is Windows
So Capability would be written like this

So these are two important component of script that are going to be executed on remote machine using Grid concept.

So lets write the complete code that runs on Selenium Grid.

1- Start the hub and node.
2- Write the code
Scenario :
a) Open the firefox browser on remote machine(Node)
b) Navigate to Google and enter string “Selenium Grid Tutorial”  in search box

So create one class GridExampleTest in your eclipse  under package pack1 and past the following code

3- Now run the code.

Above code will execute complete scenario on Windows machine with Firefox browser with version 40.0.
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This was the first code that will be used for grid example. In coming post you will see how you can run your script on multiple machines at the same time and would see how parallel execution of test cases are possible with Selenium Grid.

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  • Hi.

    According to this tutorial, you can setp up a Selenium grid with one hub and one node. In my case, I need one hub and several nodes executing the same test case. How can I run the same test case in several IP adresses (or DNS)?

    Best regards.

    • Thanks Carlos, to connect with hub you need to put selenium standalone jar and register the node with hub the way we have register single node with hub. Hope this will help you to resolve your query

      • Hi Dwarika.

        So in the java code, do I need to start a Webdriver variable with one IP Adress (or DNS) for every single node that I want to use?
        RemoteWebDriver driver = new RemoteWebDriver(new URL(“http://” + IP1 + “/wd/hub”), capabilities);
        RemoteWebDriver driver2 = new RemoteWebDriver(new URL(“http://” + IP2 + “/wd/hub”), capabilities);
        RemoteWebDriver driver3 = new RemoteWebDriver(new URL(“http://” + IP3 + “/wd/hub”), capabilities);

        and therefore to repeat all the code of the cases for every single of the driver* variables?

        Best regards.

        • For multiple invocation of browser you need to use testng testing framework and to use domain name first go and put host entry in your machine so that when ever you use dns it will take the ip directly

  • Anand Kumar Muhale


    It is a nice article. Thanks for the efforts you put in it.
    It was really helpful.

    Best Regards

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