Minimal Zope 2 test browser setup?

I try to make a test browser call to the app.absolute_url() just as a minimal variant.

the layer looks like so
https://github.com/plone/plone.namedfile/blob/scale-factories/plone/namedfile/testing.py

and its used like so (class):
https://github.com/plone/plone.namedfile/blob/scale-factories/plone/namedfile/tests/test_scaling.py#L295

and so (call):
https://github.com/plone/plone.namedfile/blob/scale-factories/plone/namedfile/tests/test_scaling.py#L316

Even if I do a browser.open(self.app.absolute_url()) I get a 404.
Any Idea what is wrong here?

I'm also stuck at this
@jensens have you found any solution?

It turns out that the documentation is still using Browser from Five package instead of using :point_down:
from plone.testing.z2 import Browser
But I couldn't remember the documentation page. I'll create an issue later if I find it.

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