fixed comment vote functional test

app/models/comment_vote.rb

@@ -4,12 +4,42 @@ class CommentVote < ActiveRecord::Base
   belongs_to :comment
   belongs_to :user
   before_validation :initialize_user, :on => :create
-  validates_presence_of :user_id, :comment_id
+  validates_presence_of :user_id, :comment_id, :score
+  validates_uniqueness_of :user_id, :scope => :comment_id
+  validate :validate_user_can_vote
+  validate :validate_comment_can_be_down_voted
+  validates_inclusion_of :score, :in => [-1, 1], :message => "must be 1 or -1"
   
   def self.prune!
     destroy_all(["created_at < ?", 14.days.ago])
   end
   
+  def validate_user_can_vote
+    if !user.can_comment_vote?
+      errors.add :user, "can not comment vote"
+      false
+    else
+      true
+    end
+  end
+  
+  def validate_comment_can_be_down_voted
+    if is_negative? && comment.creator.is_janitor? 
+      errors.add :user, "can not downvote a janitor comment"
+      false
+    else
+      true
+    end
+  end
+  
+  def is_positive?
+    score == 1
+  end
+  
+  def is_negative?
+    score == -1
+  end
+  
   def initialize_user
     self.user_id = CurrentUser.user.id
   end