Selenium Grid Tutorial: Hub & Node (with Example) (hard)

Selenium Grid Deprecation

• Selenium Grid 1 is being deprecated by the Selenium Team.

Selenium Grid Architecture

• There should be only one hub in a Selenium Grid.
• The hub runs on a single machine.
• Tests are loaded into the hub in Selenium Grid.

Selenium Grid Nodes

• Nodes are the machines that run the tests in Selenium Grid.
• Nodes can be launched on multiple machines with different platforms and browsers.
• The browser being automated is on the node machine.

Selenium Grid Configuration

• The RemoteWebDriver object requires the org.openqa.selenium.remote package to be imported.
• The DesiredCapabilities object is used to set the type of browser and OS that will be automated.
• The capabilityMatcher in the JSON config file is used to match the capabilities of the node with the test requirements.
• The JSON config file has a .json file extension.

Selenium Grid Hub

• The hub is the central point that manages the nodes and distributes the tests.
• The hub can be launched on Machine A using the command java -jar selenium-server-standalone.jar -role hub.
• Selenium Grid, by default, uses port 4444 for its web interface on Machine A.
• The Grid Console can be accessed at <a href="http://localhost:4444/grid/console">http://localhost:4444/grid/console</a>.

Selenium Grid Purpose

• The purpose of Selenium Grid is to run multiple tests simultaneously on different browsers and platforms.
• Selenium Grid uses the concept of parallel testing to run multiple tests simultaneously.
• The purpose of running tests on Selenium Grid is to save time and resources.

Selenium Grid Versions

• The main difference between Selenium Grid 1 and Selenium Grid 2 is the architecture and functionality.

Selenium Grid Verification

• The hub can be verified by accessing the Grid Console.

Selenium Grid Objects

• The Selenium Server jar file is used to launch the hub and nodes.
• The DesiredCapabilities object is used to set the type of browser and OS that will be automated.
• The RemoteWebDriver object is used to interact with the browser on the node machine.