describe 'trying to update attributes on an invalid user' do
      before(:each) do
        @zz_user = mock_basic_user

        User.stub!(:authenticate).and_return(@zz_user)
        @current_user.stub!(:merge_facebook_game_data).and_return(true)
        @zz_user.stub!(:update_attributes!).and_raise(ActiveRecord::RecordInvalid)
      end

      def act!
        facebook_post :merge_facebook_user_with_zazengo_user,
                      :user => {:username => 'test', :password => 'password'}
      end

      it_should_facebook_redirect_to { new_user_url }

      it 'should call authenticate on User' do
        User.should_receive(:authenticate).with('test', 'password').and_return(@zz_user)
        act!
      end

      it 'should merge facebook game data to the existing zazengo user' do
        @current_user.should_receive(:merge_facebook_game_data).with(@zz_user.id).and_return(true)
        act!
      end

      it 'should destroy the user that was originally associated with the facebook_id' do
        @current_user.should_receive(:destroy).once.and_return(@current_user)
        act!
      end

      it 'should raise an error when trying to update the attributes' do
        @zz_user.should_receive(:update_attributes!).with(:facebook_id => @current_user.facebook_id, :session_key => @current_user.session_key).and_raise(ActiveRecord::RecordInvalid)
        act!
      end

      it 'should set a flash error message' do
        act!
        flash[:error].should eql("There was a problem merging your account.")
      end
    end
  end








  def merge_facebook_user_with_zazengo_user
    begin
      unless params[:user].nil?
        zz_user = User.authenticate(params[:user][:username], params[:user][:password])
      else
        raise LoginError
      end

      User.transaction do
        @current_user.merge_facebook_game_data(zz_user.id)
        facebook_id = @current_user.facebook_id
        session_key = @current_user.session_key
        @current_user.destroy
        zz_user.update_attributes!(:facebook_id => facebook_id, :session_key => session_key)
      end

      redirect_to facebook_user_url(@facebook_user)

    rescue ActiveRecord::RecordInvalid
      flash[:error] = "There was a problem merging your account."
      redirect_to new_user_url
    rescue LoginError
      flash[:error] = "Username and password are incorrect."
      redirect_to new_user_url
    end
  end