Скачать или смотреть How to Run JMeter with Selenium in Parallel Mode Instead of Sequentially

Discover how to configure JMeter with Selenium to run tests in `parallel` mode, overcoming the limitations of sequential execution in browser testing.
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Introduction

Are you facing challenges while running your performance tests with JMeter and Selenium? Specifically, do you find that JMeter is executing your test scenarios sequentially rather than in parallel? This guide will explain a common issue developers encounter and how to resolve it effectively.

The Problem: Sequential Execution in JMeter

In a typical setup, JMeter can launch multiple browsers for testing. However, as experienced by many testers, when using JUnit with Selenium, tests may only proceed in the browser that is currently in focus. This means that while JMeter can technically open multiple instances of the browser, actions will only occur in the active one. As a result, if the test's execution is dependent on a specific browser being in focus, it leads to failures and unreliable test outcomes. The command used to start JMeter might look something like this:

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With this setup, you would expect all three browsers to operate simultaneously. However, only the focused instance responds to user inputs like entering usernames or clicking buttons.

Solution: Switching to Headless Mode

Fortunately, there's a simple solution to overcome the above issue: executing your tests in headless mode. This approach allows for running browser tests without the need for a graphical user interface, enabling the tests to run in the background and thus preventing focus-related problems.

Steps to Implement Headless Mode

Update Your Selenium Setup: If you're using Selenium with ChromeDriver, ensure your setup includes the necessary setup for headless operation.

Modify Your Test Configuration:

Change the code in your existing test scripts to include the Chrome options for headless mode. Here's how you can do it in Java:

[[See Video to Reveal this Text or Code Snippet]]

By adding these options, JMeter will be able to execute tests across multiple browser instances in parallel without requiring focus.

Test Your Configuration: Run your JMeter script again using the same command, adjusting for any additional parameters your test requires.

Monitor Execution: Keep an eye on the results and validate that tests now execute as expected across all initialized browser instances.

Conclusion

Switching to headless mode is a game-changer when using JMeter and Selenium together. By adopting this approach, you’ll not only resolve the sequential execution problem but also enhance the reliability of your automated tests. Embrace headless testing to allow JMeter to run tests in parallel efficiently, ensuring better resource utilization and faster test cycles.

It's time to transition to running your Selenium tests more effectively with JMeter. Happy testing!