test.rb

describe VotesController do
 
  describe "POST 'create'" do
    it "should return json success" do
      user_vote = stub_model(UserVote, :save => true)

      UserVote.stub(:new).with({ip_address: "127.0.0.1", mics: 2, round_id: 1, rapper_id: 1}) { user_vote }

      post :create, user_vote: { ip_address: "127.0.0.1", mics: 2, round_id: 1, rapper_id: 1 } 

      response.should be_success
    end
  end
 
end