diff --git a/test/functional/content_viewer_controller_test.rb b/test/functional/content_viewer_controller_test.rb
index 79d5c65..f1ffdfb 100644
--- a/test/functional/content_viewer_controller_test.rb
+++ b/test/functional/content_viewer_controller_test.rb
@@ -74,6 +74,7 @@ class ContentViewerControllerTest < ActionController::TestCase
     assert_response :success
     assert_match /^text\/html/, @response.headers['Content-Type']
     assert @response.headers['Content-Disposition'].present?
+    assert_match /attachment/, @response.headers['Content-Disposition']
   end
 
   should 'produce a download-link when article is not text/html' do
--
libgit2 0.21.2