fixes #2307

test/unit/upload_test.rb

@@ -101,6 +101,15 @@ class UploadTest < ActiveSupport::TestCase
       end
 
       context "downloader" do
+        context "for a zip that is not an ugoira" do
+          should "not validate" do
+            FileUtils.cp("#{Rails.root}/test/files/invalid_ugoira.zip", "#{Rails.root}/tmp")
+            @upload = Upload.create(:file => upload_zip("#{Rails.root}/tmp/invalid_ugoira.zip"), :rating => "q", :tag_string => "xxx")
+            @upload.process!
+            assert_equal("error: RuntimeError - missing frame data for ugoira", @upload.status)
+          end
+        end
+
         context "that is an ugoira" do
           setup do
             @url = "http://www.pixiv.net/member_illust.php?mode=medium&illust_id=46378654"