FEATURE: digest emails will try to choose topics from your tracked and watched categories first

spec/models/topic_spec.rb

@@ -1382,6 +1382,16 @@ describe Topic do
       expect(Topic.for_digest(user, 1.year.ago, top_order: true)).to eq([topic])
     end
 
+    it "sorts by category notification levels" do
+      category1, category2 = Fabricate(:category), Fabricate(:category)
+      2.times {|i| Fabricate(:topic, category: category1) }
+      topic1 = Fabricate(:topic, category: category2)
+      2.times {|i| Fabricate(:topic, category: category1) }
+      CategoryUser.create(user: user, category: category2, notification_level: CategoryUser.notification_levels[:watching])
+      for_digest = Topic.for_digest(user, 1.year.ago, top_order: true)
+      expect(for_digest.first).to eq(topic1)
+    end
+
   end
 
   describe 'secured' do