Correct site spec

app/models/site.rb

@@ -29,7 +29,7 @@ class Site
     @categories ||= begin
       categories = Category
         .secured(@guardian)
-        .joins('JOIN topics t on t.id = categories.topic_id')
+        .joins('LEFT JOIN topics t on t.id = categories.topic_id')
         .select('categories.*, t.slug topic_slug')
         .order(:position)
 

spec/models/site_spec.rb

@@ -3,6 +3,9 @@ require_dependency 'site'
 
 describe Site do
   it "omits categories users can not write to from the category list" do
+
+    ActiveRecord::Base.observers.enable :anon_site_json_cache_observer
+
     category = Fabricate(:category)
     user = Fabricate(:user)