attachment_fu, how would you test this?

Hi, i'm starting to go nuts because of this. i'm playing with
attachment_fu, everything is ok, but i also want to put everything under
test too. Actually i've a post, where you can upload images, and it
works. But now i want to set that it's mandatory to upload at least 1
image.
The code it's quite simple and stupid:

errors.add(:image, 'at least one') if post.images.size.zero?

...and obviously it works...

...but how would you test this by unit tests?
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