Introduction to Selenium Grid

Selenium Grid is a tool that allows us to run multiple Selenium tests simultaneously on different machines and browsers in parallel. Selenium Grid works on the hub-node architecture, where the hub is the central point, and one or more nodes are connected to the hub. These nodes can be located on different machines or servers.

Syntax

The syntax for running Selenium Grid is as follows:

java -jar selenium-server-standalone<version>.jar -role hub/node

Example

Suppose we want to run Selenium tests on different machines having different browsers. In that case, we can use the Selenium Grid for parallel execution of these tests.

java -jar selenium-server-standalone-3.141.59.jar -role hub

java -Dwebdriver.chrome.driver="./chromedriver" -jar selenium-server-standalone-3.141.59.jar -role node -hub http://localhost:4444/grid/register -port 5556 -browser chrome

We can run the above command on multiple machines with different browsers.

Output

The output of a Selenium Grid test is the same as a normal Selenium test run. However, the advantage of using Selenium Grid is that it saves us time and effort by running the tests in parallel.

Explanation

Selenium Grid provides a distributed test execution environment, which makes it easier to run tests on different machines and browsers in parallel. The hub, which is the central point, maintains a record of the nodes connected to it and the browsers they have. When a test is executed, the hub routes the test to an available node with the requested browser.

Use

Selenium Grid is used for the following reasons:

• To run Selenium tests on different machines in parallel
• To save time and effort by running tests in parallel
• To increase the coverage of the test by running it in different browsers

Important points

• Selenium Grid is a tool that allows us to run multiple Selenium tests simultaneously on different machines and browsers in parallel.
• Selenium Grid works on a hub-node architecture, where the hub is the central point, and one or more nodes are connected to the hub.
• The hub routes the test to an available node that has the requested browser.
• We can use Selenium Grid to run tests in parallel on different machines having different browsers, which will save time and effort.
• We can use the java -jar selenium-server-standalone<version>.jar -role hub/node command to run Selenium Grid.

Summary

In summary, Selenium Grid is a useful tool for running tests in parallel on different machines and browsers, which helps us to save time and effort. We can use the hub-node architecture to execute tests on different machines in parallel, and it is easy to set up and configure. By running tests in different browsers, we can increase the coverage of our tests and identify issues with cross-browser compatibility.