How to Run Parallel Tests on Selenium Grid Using Cucumber, Docker, and TestNG

Explore the steps to effectively run parallel tests using Selenium Grid with Cucumber and Docker. Learn how to overcome common challenges and improve your testing workflow.
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Running Parallel Tests on Selenium Grid with Cucumber and Docker

In the world of software testing, the ability to run tests concurrently is crucial for improving efficiency. If you're using Selenium Grid along with Cucumber in a Docker environment, you might be facing challenges when trying to execute your tests on multiple browser nodes simultaneously. In this post, we'll dive into how to set up your environment for parallel testing and troubleshoot common problems you might encounter along the way.

Problem Overview

You have successfully set up a Selenium Grid with a hub and three nodes (for Chrome, Firefox, and Edge) using Docker. After running a single test scenario that verifies a user's navigation on the Stack Overflow home page, your next objective is to run this test across different browsers concurrently. However, while attempting to duplicate your test class for multiple browsers, you encountered the DuplicateStepDefinitionException due to ambiguity in step definitions.

Solution Breakdown

To achieve effective parallel execution, you'll need to organize your tests properly. This involves leveraging TestNG along with Cucumber for parameterized tests. Here’s how you can set this up:

Step 1: Update Your TestNG Configuration

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

Step 2: Modify Your Java Step Definitions

Within your step definition class, you need to modify the implementation to accommodate the received browser parameter. Use the -Parameter annotation along with the -BeforeMethod to set up the appropriate WebDriver instance based on the browser parameter.

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

Step 3: Setup Docker Compose

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

Step 4: Run Your Tests

Once everything is properly configured, you can launch your tests using the command:

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

This will ensure that your Selenium Hub and nodes are up and running, ready to execute your tests in parallel.

Conclusion

Running parallel tests on Selenium Grid using Cucumber and Docker significantly speeds up your testing process. By structuring your tests with TestNG and ensuring that your WebDriver setup dynamically recognizes browser parameters, you can prevent any ambiguity in step definitions that lead to errors. With this guide, you are now equipped to tackle parallel testing efficiently and effectively.

Happy testing!