Evan Glasscock enhanced the posit-dev/py-shiny repository by implementing a timeout_secs parameter for the create_app_fixture, allowing tests to specify a custom readiness timeout for Shiny applications. This addition, developed in Python and integrated with Pytest, addressed the challenge of test flakiness by making test startup times deterministic across different environments. Evan updated the relevant Markdown documentation to reflect this fixture enhancement, ensuring clarity for future maintainers. The work focused on improving test reliability and CI stability without impacting production code, demonstrating a careful, infrastructure-oriented approach that supports more predictable release cycles and easier test maintenance for the project.