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

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30 Questions

Which version of Selenium Grid is being deprecated by the Selenium Team?

Grid 1

How many hubs should there be in a Selenium Grid?

One

Where are the tests loaded into in Selenium Grid?

Hub

Which machine runs the hub in Selenium Grid?

Machine A

What are nodes in Selenium Grid?

Selenium instances that execute the tests

Can nodes be launched on multiple machines with different platforms and browsers?

Yes

In Selenium Grid, where is the browser being automated?

Node

Which package needs to be imported for using the RemoteWebDriver object?

org.openqa.selenium.remote.RemoteWebDriver

What is the platform mentioned in the code example?

XP

What is the purpose of the DesiredCapabilities object in Selenium Grid?

To set the browser name

What is the URL for accessing the Grid Console?

What is the role of the hub in Selenium Grid?

To manage and distribute test execution

What is the file extension used for the JSON config file in Selenium Grid?

.json

What is the purpose of the capabilityMatcher in the JSON config file?

To match the capabilities of the nodes

Which command should be used to launch the hub on Machine A?

java -jar selenium-server-standalone-2.30.0.jar -role hub

Which port does Selenium Grid, by default, use for its web interface on Machine A?

4444

What is the purpose of Selenium Grid?

To run tests against different browsers, operating systems, and machines simultaneously

What is the main difference between Selenium Grid 1 and Selenium Grid 2?

Selenium Grid 1 has its own remote control, while Selenium Grid 2 is bundled with the Selenium Server jar file

What is used to set the type of browser and OS that will be automated in Selenium Grid?

DesiredCapabilites

What is used to set which node (or machine) that a test will run against in Selenium Grid?

RemoteWebDriver

What is the purpose of running tests on Selenium Grid?

To ensure compatibility with a wide range of browser-OS combinations and save time in test execution

Which concept does Selenium Grid use to run multiple tests simultaneously on different browsers and platforms?

Hub-node concept

What is the purpose of the hub in Selenium Grid?

To load the tests

What are nodes in Selenium Grid?

Selenium instances that execute the tests

How can you verify if the hub in Selenium Grid is running?

Through the command prompt and a browser

What should be used to set the type of browser and OS in Selenium Grid?

DesiredCapabilities

What should be used to specify which node (or machine) the test will run against in Selenium Grid?

RemoteWebDriver

What is the purpose of the Selenium Server jar file in Selenium Grid?

To install Selenium Grid

What is the purpose of the DesiredCapabilities object in Selenium Grid?

To set the type of browser and OS

What is the purpose of the RemoteWebDriver object in Selenium Grid?

To specify which node (or machine) the test will run against

Study Notes

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.

Test your knowledge of Selenium Grid with this step-by-step tutorial. Learn how to automate web browsers using the DesiredCapabilities object and navigate the Grid's web interface. Discover how to identify the platform and browserName for automation.

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