Y U NO RECEIVED UPDATE_ATTRIBUTES!?

users_controller.rb

class Admin::UsersController < Admin::AdminController
  def index
    @users = User.all

    respond_to do |format|
      format.html
    end
  end

  def show
    @user = User.find(params[:id])

    respond_to do |format|
      format.html
    end
  end

  def update
    @user = User.find(params[:id])

    respond_to do |format|
      if @user.update_attributes(params[:user])
        flash[:success] = 'Updated user successfully'
        format.html { redirect_to [:admin, @user] }
      else
        format.html { render 'show', status: 400 }
      end
    end
  end
end

users_controller_spec.rb

describe Admin::UsersController, 'update' do
  sign_in_admin

  let(:user) { mock_model(User, id: 1, update_attributes: true) }

  before :each do
    User.stub(:find) { user }
  end

  it 'assigns user' do
    put :update, id: 1, user: { admin: true }
    assigns(:user).should == user
  end

  it 'should receive update_attributes' do
    user.should_receive(:update_attributes) { true }
    put :update, id: 1, user: { admin: true }
  end

  it 'redirects to user on valid update' do
    put :update, id: 1, user: { admin: true }
    response.should redirect_to(admin_user_path(user))
  end
end