How can automated end-to-end testing and code quality checks for an extension be set up before release?
Automating browser extension testing differs significantly from testing regular web applications due to the specific multi-component architecture, which includes popups, background scripts, and options pages. To check the functionality of this entire complex, specialized automation libraries such as Puppeteer or Playwright are used, which can launch a browser along with a pre-packaged extension. This allows simulating real user actions, clicking icons, switching tabs, and checking interface changes.
Organizing the continuous integration process requires setting up a virtual environment capable of running a graphical interface or operating in headless mode with support for loading unpacked extensions via the command line. The developer needs to write scripts that verify the correctness of the background service worker, the presence of host permissions, and the proper saving of settings in local storage. This approach helps catch regression bugs early in the coding phase, long before submitting updates for moderation in the official store.
To build a reliable automated testing pipeline, it is useful to adhere to the following steps:
Implementing such practices increases the stability of the final product, reduces the number of critical bugs, and saves the team's working time when releasing frequent updates.