Rails - May 2008 - 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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Here''s a rough cut off the top of my head. (I haven''t used
Test::Unit
in a long time; I hope I''m not too rusty).

# using RSpec
describe Post do

  it "is invalid without at least one image" do
    post = Post.new
    post.should_not be_valid
  end

  it "is valid with at least one image" do
    post = Post.new :images => [Image.new]
    post.should be_valid
  end

end

# using Test::Unit
class PostTest < Test::Unit::TestCase

  def test_invalid_without_at_least_one_image
    post = Post.new
    assert !post.valid?
  end

  def test_valid_with_at_least_one_image
    post = Post.new :images => [Image.new]
    assert post.valid?
  end

end

I assume that you''ve written your own validate method on your model.
You can also use validates_length_of or validates_size_of for the
images association, e.g.,

validates_length_of :images, :minimum => 1, :message => "at least
%d"

Regards,
Craig

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