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

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Questions and Answers

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

  • Neither Grid 1 nor Grid 2
  • Grid 2
  • Both Grid 1 and Grid 2
  • Grid 1 (correct)

How many nodes can there be in a Selenium Grid?

  • Depends on the number of tests
  • Only one
  • Two or more (correct)
  • Depends on the number of hubs

Where are the tests loaded into in Selenium Grid?

  • Hub (correct)
  • Neither Hub nor Node
  • Node
  • Both Hub and Node

On which machine is the hub launched in Selenium Grid?

<p>Machine A (A)</p>
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Which component of Selenium Grid executes the tests loaded on the hub?

<p>Node (B)</p>
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Do the machines running the nodes need to be the same platform as that of the hub in Selenium Grid?

<p>No (B)</p>
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What is the purpose of Selenium Grid?

<p>Running tests on different browsers, operating systems, and machines in parallel (A)</p>
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Which package needs to be imported to use the DesiredCapabilities object?

<p>org.openqa.selenium.remote.DesiredCapabilities (D)</p>
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What is the platform in the given example?

<p>XP (D)</p>
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What is the browserName in the given example?

<p>Firefox (C)</p>
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What is the role of the hub in Selenium Grid?

<p>To manage and distribute test scripts (C)</p>
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What is the purpose of the JSON config file in Selenium Grid?

<p>To configure the nodes (C)</p>
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What is the command to launch the hub using the JSON config file?

<p>java -jar selenium-server-standalone-2.53.1.jar -role hub -hubConfig hubconfig.json (C)</p>
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What is the purpose of the Grid Console in Selenium Grid?

<p>To monitor the status of the hub (C)</p>
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Which command should be used to launch the hub on Machine A?

<p>java -jar selenium-server-standalone-2.30.0.jar -role hub (C)</p>
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Which port number is used by Selenium Grid for its web interface on Machine A?

<p>4444 (B)</p>
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What is the purpose of launching a node in Selenium Grid?

<p>To run tests against different browsers, operating systems, and machines (C)</p>
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What is the difference between Selenium Grid 1 and Selenium Grid 2?

<p>All of the above (D)</p>
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What is used to set the type of browser and OS that will be automated in Selenium Grid?

<p>DesiredCapabilities (D)</p>
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What is used to set which node (or machine) the test will run against in Selenium Grid?

<p>RemoteWebDriver (D)</p>
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What are the benefits of using Selenium Grid?

<p>Both A and B (C)</p>
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Which concept does Selenium Grid use to run multiple tests simultaneously on different browsers and platforms?

<p>Hub-node concept (B)</p>
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What is the purpose of the hub in Selenium Grid?

<p>To load tests (D)</p>
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How can you verify if the hub is running in Selenium Grid?

<p>Through the command prompt or a browser (A)</p>
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What is the purpose of the DesiredCapabilities object in Selenium Grid?

<p>To set the type of browser and OS for automation (D)</p>
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What is the purpose of the RemoteWebDriver object in Selenium Grid?

<p>To set which node (or machine) the test will run against (D)</p>
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Which component of Selenium Grid is responsible for executing the tests?

<p>Nodes (B)</p>
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How can you install Selenium Grid?

<p>Download the Selenium Server jar file (D)</p>
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What are the two ways to verify if the hub is running in Selenium Grid?

<p>Through the command prompt and a browser (A)</p>
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What is the purpose of the nodes in Selenium Grid?

<p>To execute the tests loaded on the hub (C)</p>
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Study Notes

Selenium Grid

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

Selenium Grid Architecture

  • There can be multiple nodes in a Selenium Grid.
  • Tests are loaded into the hub in Selenium Grid.
  • The hub is launched on a machine, which can be different from the nodes.

Node and Hub

  • The node component executes the tests loaded on the hub.
  • Machines running the nodes do not need to be the same platform as the hub.

Purpose of Selenium Grid

  • The purpose of Selenium Grid is to run tests in parallel on multiple machines, allowing for faster test execution.

DesiredCapabilities

  • The DesiredCapabilities object is used to set the type of browser and OS that will be automated.
  • The DesiredCapabilities object is imported from the org.openqa.selenium.remote package.

JSON Config File

  • The JSON config file is used to configure the hub.
  • The command to launch the hub using the JSON config file is java -jar selenium-server-standalone.jar -role hub -hubConfig hub.json.

Grid Console

  • The Grid Console is used to monitor the grid and view the nodes and their status.

Launching Hub and Node

  • The command to launch the hub on Machine A is java -jar selenium-server-standalone.jar -role hub.
  • The hub uses port 4444 by default for its web interface.
  • The purpose of launching a node is to register it with the hub and make it available for test execution.

Selenium Grid 1 and 2

  • Selenium Grid 2 is an improvement over Selenium Grid 1, with a more scalable and flexible architecture.

Benefits of Selenium Grid

  • The benefits of using Selenium Grid include faster test execution, parallel testing, and the ability to test on multiple browsers and platforms.

Grid Concepts

  • Selenium Grid uses the concept of parallel testing to run multiple tests simultaneously on different browsers and platforms.

Verifying Hub

  • The hub can be verified by checking the Grid Console or by using the command curl <a href="http://localhost:4444/grid/console">http://localhost:4444/grid/console</a>.

RemoteWebDriver

  • The RemoteWebDriver object is used to execute tests on a remote node.

Installing Selenium Grid

  • Selenium Grid can be installed by downloading the Selenium Server JAR file and running it with the java command.

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