Draper Decorator spec not able to use Devise current_user method

Question

I have a PostDecorator class in app/decorators/post_decorator.rb. It has a method that calls Devise's current_user method. It looks like this:

class PostDecorator < Draper::Decorator
  delegate_all

  def voter
    h.current_user
  end
end

I have a PostDecorator spec in spec/decorators/post_decorator_spec.rb

require 'spec_helper'

describe PostDecorator, type: :decorator do
  let(:post) { FactoryGirl.create(:post) }
  let(:user) { FactoryGirl.create(:user) }
  before { allow(helper).to receive(:current_user) { user } }

  describe 'voter' do
    it 'returns the current_user' do
      expect(post.voter).to eq user
    end
  end
end

When I run this I get an undefined method error:

<Draper::HelperProxy:0x007fb1c4f85890 ... does not implement: current_user

Gem Versions:

• draper (1.4.0)
• rspec-rails (3.4.1)
• devise (3.5.5)

Also I should note everything in my app/lib directory is auto loaded. In application.rb I have config.autoload_paths << Rails.root.join('lib')

Answer 1

The issue is related to Draper. Decorator is unable to access helper methods after sending an ActionMailer email.

This is an open issue on Draper's GitHub

To solve this I just modified the User Factory by adding a confirmed_at:

factory :user do
  ...
  confirmed_at DateTime.now
end

This way Devise won't send a Confirmation email.

Answer 2

Two things I think you need to do.

1.) Add devise test helpers to your decorator tests,

RSpec.configure do |config|
  config.include Devise::TestHelpers, type: :decorator
end

2.) you actually need to sign_in to expect post.voter to eq an actual users

require 'spec_helper'

describe PostDecorator, type: :decorator do
  let(:post) { FactoryGirl.create(:post) }
  let(:user) { FactoryGirl.create(:user) }
  before do
    sign_in user
  end

  describe '.voter' do
    it 'returns the current_user' do
      expect(post.voter).to eq user
    end
  end
end