fixing functional tests

app/logical/post_sets/artist.rb

@@ -6,5 +6,13 @@ module PostSets
       super(:tags => artist.name)
       @artist = artist
     end
+    
+    def posts
+      ::Post.tag_match(@artist.name)
+    end
+
+    def presenter
+      ::PostSetPresenters::Post.new(self)
+    end
   end
 end