added post voting

test/unit/comment_test.rb

@@ -38,7 +38,7 @@ class CommentTest < ActiveSupport::TestCase
       post = Factory.create(:post)
       c1 = Factory.create(:comment, :post => post)
       assert_nothing_raised {c1.vote!(user, true)}
-      assert_raise(Comment::VotingError) {c1.vote!(user, true)}
+      assert_raise(CommentVote::Error) {c1.vote!(user, true)}
       assert_equal(1, CommentVote.count)
     
       c2 = Factory.create(:comment, :post => post)

test/unit/comment_vote_test.rb

@@ -1,8 +0,0 @@
-require 'test_helper'
-
-class CommentVoteTest < ActiveSupport::TestCase
-  # Replace this with your real tests.
-  test "the truth" do
-    assert true
-  end
-end

test/unit/post_test.rb

@@ -405,4 +405,16 @@ class PostTest < ActiveSupport::TestCase
       assert_equal(post3.id, relation.first.id)      
     end
   end
+
+  context "Voting on a post" do
+    should "not allow duplicate votes" do
+      user = Factory.create(:user)
+      post = Factory.create(:post)
+      assert_nothing_raised {post.vote!(user, true)}
+      assert_raise(PostVote::Error) {post.vote!(user, true)}
+      post.reload
+      assert_equal(1, PostVote.count)
+      assert_equal(1, post.score)
+    end
+  end
 end