Selenium has long been a stalwart in the realm of open-source frameworks for end-to-end web testing, and its efficacy continues to evolve. As the web development landscape advances, so too must the testing frameworks that underpin the quality assurance process. Enter JUnit 5, the latest iteration of the widely-used Java open-source unit testing framework. With it comes a groundbreaking programming and extension model named Jupiter. This paradigm shift sets the stage for enhanced integration with Selenium through an open-source extension known as Selenium-Jupiter. Selenium-Jupiter At its core, Selenium-Jupiter is a JUnit 5 extension designed to seamlessly integrate with Selenium, providing a robust environment for creating and executing Selenium tests. One of its key advantages lies in reducing boilerplate code through the utilization of JUnit 5’s dependency injection mechanism. This facilitates the creation of Selenium tests using both local and remote browsers, offering flexibility in test environment configurations. A notable feature of Selenium-Jupiter is its out-of-the-box support for various web browsers and Android devices within Docker containers. This capability streamlines the process of conducting diverse tests, including functional, compatibility, and performance tests for web and mobile applications. Test templates can be employed to define different devices or browser types and versions, while Kubernetes facilitates the execution of performance tests across a significant number of browsers. Diagnostics play a crucial role in identifying and resolving issues in Selenium tests, and Selenium-Jupiter takes this aspect to the next level. The extension provides advanced diagnostic capabilities, such as screenshotting, which captures the state of the browser just before a failure occurs. This visual insight proves invaluable in discerning the nature of the problem. For scenarios where a screenshot may not suffice, Selenium-Jupiter allows users to observe the evolution of the web under test by recording the browser’s GUI session. Even in headless environments like Jenkins or Travis, this process is executed seamlessly through the use of Docker containers, VNC, and FFmpeg. Moreover, Selenium-Jupiter facilitates access to browser logs to debug JavaScript traces in applications. While the Selenium API traditionally supports this feature only in Chrome, the extension addresses this limitation by implementing monkey patching at the JavaScript level through a cross-platform browser extension. This ensures compatibility with browsers like Firefox and Opera controlled via the Selenium WebDriver. Integration with popular CI/CD Integration with popular CI/CD tools, such as Jenkins and Slack, is another feather in the cap of Selenium-Jupiter. Upon test failure, the extension automatically publishes diagnostic files—including PNG screenshots, MP4 recordings, and TXT logs—directly to the Jenkins GUI or Slack channel.

1. Selenium-Jupiter: Empowering
Selenium Tests with JUnit 5 Integration
Selenium has long been a stalwart in the realm of open-source frameworks for end-
to-end web testing, and its efficacy continues to evolve. As the web development
landscape advances, so too must the testing frameworks that underpin the quality
assurance process. Enter JUnit 5, the latest iteration of the widely-used Java open-
source unit testing framework. With it comes a groundbreaking programming and
extension model named Jupiter. This paradigm shift sets the stage for enhanced
integration with Selenium through an open-source extension known as Selenium-
Jupiter.
Selenium-Jupiter
At its core, Selenium-Jupiter is a JUnit 5 extension designed to seamlessly integrate
with Selenium, providing a robust environment for creating and executing Selenium
tests. One of its key advantages lies in reducing boilerplate code through the
utilization of JUnit 5’s dependency injection mechanism. This facilitates the creation
of Selenium tests using both local and remote browsers, offering flexibility in test
environment configurations.
A notable feature of Selenium-Jupiter is its out-of-the-box support for various web
browsers and Android devices within Docker containers. This capability streamlines
the process of conducting diverse tests, including functional, compatibility, and
performance tests for web and mobile applications. Test templates can be employed

2. to define different devices or browser types and versions, while Kubernetes facilitates
the execution of performance tests across a significant number of browsers.
Diagnostics play a crucial role in identifying and resolving issues in Selenium tests,
and Selenium-Jupiter takes this aspect to the next level. The extension provides
advanced diagnostic capabilities, such as screenshotting, which captures the state of
the browser just before a failure occurs. This visual insight proves invaluable in
discerning the nature of the problem.
For scenarios where a screenshot may not suffice, Selenium-Jupiter allows users to
observe the evolution of the web under test by recording the browser’s GUI session.
Even in headless environments like Jenkins or Travis, this process is executed
seamlessly through the use of Docker containers, VNC, and FFmpeg.
Moreover, Selenium-Jupiter facilitates access to browser logs to debug JavaScript
traces in applications. While the Selenium API traditionally supports this feature only
in Chrome, the extension addresses this limitation by implementing monkey patching
at the JavaScript level through a cross-platform browser extension. This ensures
compatibility with browsers like Firefox and Opera controlled via the Selenium
WebDriver.
Integration with popular CI/CD
Integration with popular CI/CD tools, such as Jenkins and Slack, is another feather in
the cap of Selenium-Jupiter. Upon test failure, the extension automatically publishes
diagnostic files—including PNG screenshots, MP4 recordings, and TXT logs—directly
to the Jenkins GUI or Slack channel. This feature enhances collaboration and
expedites issue resolution by providing comprehensive insights into test failures.
Conclusion
In conclusion, Selenium-Jupiter emerges as a powerful extension that harmoniously
blends the capabilities of Selenium with the flexibility and sophistication of JUnit 5.
Its seamless integration, support for diverse testing scenarios, and advanced
diagnostic features position it as a valuable asset for developers and QA
professionals striving for excellence in web and mobile application testing.