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 need for more deterministic and reliable test execution 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 infrastructure without impacting production code, resulting in reduced test flakiness and more stable continuous integration pipelines. The depth of the change supports easier test maintenance and predictable release cycles.