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Learn how to capture screenshots on test errors in Pytest Selenium, including test failures in fixtures. Master the art of debugging with this essential guide!
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This video is based on the question https://stackoverflow.com/q/73540231/ asked by the user 'dastan12' ( https://stackoverflow.com/u/9043973/ ) and on the answer https://stackoverflow.com/a/73545040/ provided by the user 'Teejay Bruno' ( https://stackoverflow.com/u/13261176/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Take a Screenshot on Test Error Using Pytest Selenium

When working on automated testing using Python's pytest and Selenium, it's common to encounter scenarios where tests fail. Capturing the state of your application at the point of failure can be tremendously helpful for debugging. In this post, we will explore how to take screenshots when a test fails, specifically focusing on the issues that arise when a failure occurs inside a pytest fixture.

The Problem

Imagine running your test suite and encountering a situation where a test fails, but the associated screenshot you expected to capture doesn't appear. This often occurs because the failure took place within a pytest fixture, causing the test to report an error status instead of failed. In this instance, the standard hook to capture screenshots does not activate as intended.

What You Need to Know

Fixtures: Fixtures in pytest are functions that run before your tests, helping to prepare the testing environment.

Hooks: Pytest provides hooks that let users tap into the testing process at various stages.

The Solution

To resolve the issue of not capturing screenshots on test failures occurring in fixtures, we will modify the pytest hook. The key is to ensure that our hook checks both the setup and call phases during the test execution process.

Step-by-Step Guide to Modify the Hook

1. Modify the Hook Function

Here is a revised version of the pytest hook that will allow it to take screenshots for failures in both the setup and the test execution phases:

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

Breakdown of Changes

Phase Check: The condition if report.when in ("setup", "call"): has been modified to capture events in both phases. This change is essential as it allows the hook to act on failures from fixtures as well.

Screenshot Logic: The existing logic to determine whether a test has failed remains intact, ensuring that additional mechanisms (e.g., handling expected failures) are honored.

Optional Delay: The time.sleep(1) line adds a brief pause which can stabilize the screenshot capture, ensuring the UI is rendered before the screenshot is taken.

Conclusion

With these modifications, you should now be able to capture screenshots even when your tests fail during the execution of fixtures. This enhancement greatly aids in debugging, providing you with visual context about what went wrong.

If you find yourself regularly running into issues with test failures in pytest and Selenium, implementing this solution will help you catch errors more effectively and streamline your debugging processes.



By following these steps, you can ensure that you never miss a crucial screenshot again, giving you a clearer insight into your tests and ultimately leading to better code quality. Happy testing!