During July 2025, contributed to the posit-dev/py-shiny repository by implementing a timeout_secs parameter for the create_app_fixture in shiny/pytest/_fixture.py. This enhancement allows tests to specify a custom readiness timeout for Shiny applications, improving test determinism and reliability across different environments. The work focused on Python development and leveraged Pytest for testing infrastructure, with documentation updates made in Markdown to reflect the changes. By enabling configurable startup waits, the update reduced test flakiness and supported more stable continuous integration workflows, while maintaining minimal impact on production code and aligning with broader goals for CI stability and test maintainability.