In Selenium Grid, the hub is a computer which is the central point where we can load our tests into. There are two main elements to Selenium Grid - a hub, and nodes.

You specify these values through Selenium Remote's Capabilities. You can connect to it with Selenium Remote by specifying the browser, browser version, and operating system you want.

It is a part of the Selenium Suite which specialise in running multiple tests across different browsers, operating system and machines. The Selenium Grid is a testing tool which allows us to run our tests on different machines against different browsers. Lets understand Selenium Grid in more details below. Using Selenium Grid you can run tests on a variety of Operating System and Browser combinations. This enables us to create a network of test machines with varying combinations of Operating system and browsers. Each node is basically a computer ( even a virtual machine) with a combination of Operating system and Browsers. This network of test machines is controlled by a Hub, using which you can run your tests on different connected nodes. With Selenium Grid you can create a network of connected test machines ( also called nodes). If you're looking to run your tests on different browsers and operating system combinations but you're unable to justify using a third-party solution like Sauce Labs or Browser Stack then what do you do? Also, it is not advisable to manage different versions of the same browser on a single machine. Sure, we can have the browsers installed on our box, but then we are limited because we can have only one version of a browser flavor at a given time. Chrome browser reached to its version 57 as of today March’17.įor better user experience, it becomes necessary to validate the application with the different combinations of browsers and also different versions of same browser. Likewise browsers which we use are also upgrading day by day. We see a host of new software and lot of existing software being updated frequently. In the current scenario, technology is going through rapid changes.

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