* Refactored PostSet, splitting it into PostSets::Post and PostSets::Favorite

* Additional functional tests

app/logical/post_sets/base.rb

@@ -0,0 +1,39 @@
+module PostSets
+  class Base
+    attr_accessor :page, :before_id, :count
+  
+    def initialize(options = {})
+      @page = options[:page].to_i
+      @before_id = options[:before_id]
+      load_posts
+    end
+    
+    def has_wiki?
+      false
+    end
+  
+    def use_sequential_paginator?
+      !use_numbered_paginator?
+    end
+  
+    def use_numbered_paginator?
+      before_id.nil?
+    end
+  
+    def load_posts
+      raise NotImplementedError
+    end
+  
+    def to_xml
+      posts.to_xml
+    end
+  
+    def to_json
+      posts.to_json
+    end
+  
+    def presenter
+      @presnter ||= PostSetPresenter.new(self)
+    end
+  end
+end