This pattern can be found in most great url based testing tools.
At the moment, this url is locked and I have actually to go back first to start a new test:
I should be able to start a test from there though. A good example for referencing would ge Google’s Rich Result testing tool:
(https://search.google.com/test/rich-results/result?id=M4fyFXkdBBCWIWdg6bWP6w)If there are certain limitations why a specific implementation like that isn’t possible, a “Switch URL” approach like Measure page quality or https://pagespeed.web.dev do it should be possible.