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There is indeed no test page for sane, so i made mine.
Cheated by using doas, because i can't find a proper way to have permissions for libusb as a user 😔
Sorry for the poor drawing ^^'
After reading /usr/local/share/doc/pkg-readmes/sane* i found why.
My scanner especially requires my user account to be added to the _saned group. #pebkac