Add downvotes

app/roles/votes.rb

@@ -3,4 +3,9 @@ module Votes
   def upvotes
     notes.select(&:upvote?).size
   end
+
+  # Return the number of -1 comments (downvotes)
+  def downvotes
+    notes.select(&:downvote?).size
+  end
 end

spec/roles/votes_spec.rb

@@ -1,8 +1,9 @@
 require 'spec_helper'
 
-describe Issue, "Upvote" do
+describe Issue do
   let(:issue) { create(:issue) }
 
+  describe "#upvotes" do
     it "with no notes has a 0/0 score" do
       issue.upvotes.should == 0
     end
@@ -25,3 +26,28 @@ describe Issue, "Upvote" do
       issue.upvotes.should == 2
     end
   end
+
+  describe "#downvotes" do
+    it "with no notes has a 0/0 score" do
+      issue.downvotes.should == 0
+    end
+
+    it "should recognize non--1 notes" do
+      issue.notes << create(:note, note: "Almost got a -1")
+      issue.should have(1).note
+      issue.notes.first.downvote?.should be_false
+      issue.downvotes.should == 0
+    end
+
+    it "should recognize a single -1 note" do
+      issue.notes << create(:note, note: "-1 This is bad")
+      issue.downvotes.should == 1
+    end
+
+    it "should recognize multiple -1 notes" do
+      issue.notes << create(:note, note: "-1 This is bad")
+      issue.notes << create(:note, note: "-1 Away with this")
+      issue.downvotes.should == 2
+    end
+  end
+end