Problem: You’re testing via @testling_lib, and you want to debug what you’re...
Problem: You’re testing via @testling_lib, and you want to debug what you’re testing in a browser.
Solution: screen.logTestingPlaygroundURL()
This logs a Testing Playground URL to the console that you can use to open your test in a browser.
It suggests queries on click too.
Note: There's a downside to this: It doesn't include your app's CSS, so the preview in the top-righthand box isn't styled.