document how to use when testing within a bundle

[tacman]

I have a bundle that exposes a few controllers that I'm not sure how to test (from within the bundle).

https://github.com/symfony/symfony/discussions/57600#discussioncomment-9925933

Might that be possible with this library? In particular, I'm not sure how to configure the routes, so that I can go to

$this->browser()
        ->visit('/my-bundle/admin')
        ->assertSuccessful()

Thanks.