Adapt the spec

spec/factories/sponsors.rb

@@ -5,11 +5,14 @@ FactoryGirl.define do
     name 'Example sponsor'
     website_url 'http://www.example.com'
     description 'Lorem Ipsum Dolor'
-    logo_file_name 'rails.jpg'
-    logo_file_size 2000
-    logo_content_type 'image/jpeg'
-    logo_updated_at DateTime.current
     sponsorship_level
     conference
+
+    after(:create) do |sponsor|
+      uploader = PictureUploader.new(sponsor, :picture)
+      File.open('app/assets/images/rails.png') { |f| uploader.store!(f) }
+      sponsor.logo_file_name = 'rails.png'
+      sponsor.save
+    end
   end
 end