For production-grade Shiny applications, regression testing ensures that the application maintains its core functionality as new features are added to the app. With the help of various R and Python tools that programmatically interact with the UI and examine UI outputs, regression test logic can be represented programmatically and can run as often as needed. This gives the development team an opportunity to catch and fix bugs before they are pushed to production.

In this talk, I will introduce a framework for automated testing of Shiny applications both (1) during the development phase and (2) after the app is deployed. I will share a demo Shiny app along with relevant shinytest2 and Selenium code.