Wednesday, May 30, 2007

Functional Testing for Attachment-fu

I found a lot of good tutorials on how to setup attachment_fu (which lets you easily store images or other binary data in a Rails app, either in the filesystem or in the database itself), but none of them explain how to write proper functional tests. Since a lot of other people have been posting this question, I thought I would post what I just got working:

def test_should_create_new_attachment

fdata = fixture_file_upload('/files/photo1.jpg', 'image/jpeg')

login_as :bob

assert_difference Photo, :count, 2 do
post :create, :photo => { :uploaded_data => fdata }, :html => { :multipart => true }
end

assert_redirected_to user_url(users(:bob))
assert_valid assigns(:photo)

end

The above assumes you create a 'files' directory inside of your fixtures directory. Also note that if you have thumbnailing enabled, each file you upload will create multiple attachment objects (in this case, one to represent the original image and one to represent a thumbnail).

If you're curious, here's how I have the plugin configured:

class Photo < ActiveRecord::Base

has_attachment :content_type => :image,
:storage => :file_system,
:max_size => 500.kilobytes,
:resize_to => '320x200>',
:thumbnails => { :thumb => '100x100>' },
:processor => 'ImageScience'

validates_as_attachment

end

Labels: rails, testing