[Rails] Raisl 4.2 + Capybara + Paperclip = Race condition

[Cezinha Anjos]

Hi!

I'm upgrading a small Rails 4.1.x app to 4.2.

All my test suite is passing, except one spec:

    scenario "showing a video called from a track" do
      visit video_path(video, level_id: level.id)
      sign_in create(:confirmed_user)

      expect(page).to have_selector 
"video[poster=\"#{video.poster(:original)}\"]"      
    end

Here is the factory:

FactoryGirl.define do
  factory :video do
    title "Cadastrando um cliente"
    poster { 
Rack::Test::UploadedFile.new("#{::Rails.root}/spec/fixtures/image.png", 
"image/png") }
    video { 
Rack::Test::UploadedFile.new("#{::Rails.root}/spec/fixtures/video.mp4", 
"video/mp4") }
  end
end

That's the problem:

Video Pages

  when showing

    showing a video called from a track (FAILED - 1)

  HTML screenshot: 
/Users/cezinha/dev/universidade/tmp/capybara/2015-01-06-09-31-30-screenshot-showing-a-video-called-from-a-track.html


Failures:


  1) Video Pages when showing showing a video called from a track

     Failure/Error: expect(page).to have_selector 
"video[poster=\"#{video.poster(:original)}\"]"

       expected to find css 
"video[poster=\"/system/videos/posters/000/000/001/original/image.png?1420543889\"]"
 
but there were no matches

     # ./spec/features/video_spec.rb:66:in `block (3 levels) in <top 
(required)>'

When I inspect the generated HTML I have:

<video class="img-responsive"

          controls preload autoplay 
poster="/system/videos/posters/000/000/001/original/image.png?*1420543954*"

          data-level_id=1

         <source 
src=/system/videos/videos/000/000/001/original/video.mp4?1420543954 
type="video/mp4" />

When I inspect the video.poster(:original) I have:


/system/videos/posters/000/000/001/original/image.png?1420543953


The worst: sometimes it pass and sometimes not.

My impression is that the content of the file is changing while I'm testing 
and because of this, the fingerprint is different too.

Does anyone can help me?

Thanks.

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