added user feedback test

app/models/user_feedback.rb

@@ -1,5 +1,14 @@
 class UserFeedback < ActiveRecord::Base
   set_table_name "user_feedback"
   belongs_to :user
+  belongs_to :creator, :class_name => "User"
   attr_accessible :body, :user_id, :is_positive
+  validates_presence_of :user_id, :creator_id, :body
+  validate :creator_is_privileged
+  
+  def creator_is_privileged
+    if !creator.is_privileged?
+      errors[:creator] << "must be privileged"
+    end
+  end
 end