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Learn essential techniques for creating stable and efficient web user interface tests in this 19-minute conference talk from EuroPython 2025. Discover how to overcome common challenges with flaky, slow UI tests that often fail due to server issues and make test suites unstable, particularly problematic in open source environments where tests gate patch merging. Explore practical solutions using PyTest and Selenium through specific code examples that demonstrate how to make test suites more reliable and faster. Master the distinction between unit tests and integration tests, understand how to use API calls for test setup and verification, and learn to limit test scope through PyTest mocking. Gain insights into advanced testing features including dependency injection and parametrization that can significantly improve your testing workflow. Perfect for developers looking to stabilize existing UI test suites or those beginning to write tests for web applications.
