FIX: You could update a topic to have a title that's too short if the TextCleaner

removed extra characters. Additionally, updating the title will not return an error
message to the client app if the operation fails (rather than failing silently.)

spec/controllers/topics_controller_spec.rb

@@ -487,6 +487,11 @@ describe TopicsController do
           xhr :put, :update, topic_id: @topic.id, slug: @topic.title, category: 'incredible'
         end
 
+        it "returns errors with invalid titles" do
+          xhr :put, :update, topic_id: @topic.id, slug: @topic.title, title: 'asdf'
+          expect(response).not_to be_success
+        end
+
       end
     end
   end