FIX: subfolder digest emails have incorrect URLs

spec/mailers/user_notifications_spec.rb

@@ -127,9 +127,7 @@ describe UserNotifications do
 
     context "with new topics" do
 
-      before do
-        Fabricate(:topic, user: Fabricate(:coding_horror), created_at: 1.hour.ago)
-      end
+      let!(:popular_topic) { Fabricate(:topic, user: Fabricate(:coding_horror), created_at: 1.hour.ago) }
 
       it "works" do
         expect(subject.to).to eq([user.email])
@@ -206,6 +204,22 @@ describe UserNotifications do
         expect(html).to include '1E1E1E'
         expect(html).to include '858585'
       end
+
+      it "supports subfolder" do
+        GlobalSetting.stubs(:relative_url_root).returns('/forum')
+        Discourse.stubs(:base_uri).returns("/forum")
+        html = subject.html_part.body.to_s
+        text = subject.text_part.body.to_s
+        expect(html).to be_present
+        expect(text).to be_present
+        expect(html).to_not include("/forum/forum")
+        expect(text).to_not include("/forum/forum")
+        expect(subject.header["List-Unsubscribe"].to_s).to match(/http:\/\/test.localhost\/forum\/email\/unsubscribe\/\h{64}/)
+
+        topic_url = "http://test.localhost/forum/t/#{popular_topic.slug}/#{popular_topic.id}"
+        expect(html).to include(topic_url)
+        expect(text).to include(topic_url)
+      end
     end
 
   end