Vitest 4 Browser Preview Provider

Testing https://github.com/vitest-dev/vitest/pull/8977 PR.

Spin browser instances (only on local, on StackBlitz not supported)

This repo includes a copy of Vite’s openBrowser to allow spin the proper browser when running tests with multiple browser instances using the preview provider (only on local, on StackBlitz will use the Vitest Preview Provider, check Vitest config file).

I need to figure out what’s the problem running npm run test:browser on local, Firefox trying to run Chrome project (check last screenshot below): memory heap error at Firefox (it hangs, on page refresh shows the chrome project). From time to time it just works, check first screenshot below (tried also with hanging-process reporter but nothing shown in the terminal).

We need to store browser and session id pairs to show proper url in the terminal when launching the browser instances: https://github.com/vitest-dev/vitest/pull/8977 PR getting the first session id to log the url in the terminal.

We also need to prevent launching multiple browsers when running on StackBlitz at Vitest.

Vitest debug output running multiple instances working

Vitest debug output running multiple instances