adds TopMenuItem model which encapsulates top_menu parsing logic

spec/controllers/list_controller_spec.rb

@@ -6,19 +6,22 @@ describe ListController do
   before do
     @user = Fabricate(:coding_horror)
     @post = Fabricate(:post, user: @user)
+
+    # forces tests down some code paths
+    SiteSetting.stubs(:top_menu).returns('latest,-video|new|unread|favorited|categories|category/beer')
   end
 
   describe 'indexes' do
 
     [:latest, :hot].each do |filter|
-      context '#{filter}' do
+      context "#{filter}" do
         before { xhr :get, filter }
         it { should respond_with(:success) }
       end
     end
 
     [:favorited, :read, :posted, :unread, :new].each do |filter|
-      context '#{filter}' do
+      context "#{filter}" do
         it { expect { xhr :get, filter }.to raise_error(Discourse::NotLoggedIn) }
       end
     end